Content      ..     4      5      6      7     ..

ENC EN500 / EN600 series inverter (ver. 2.0). Service manual - page 6

7 Detailed function specification

7.20 Protective Relevant Function Parameters Group:F19

Range: 0.0～20.0s

Power off restart waiting

F19.00

(0 indicates disabled this

0.0s

time

function）

When the power is off, then power-on, whether this inverter will start

automatically after a waiting time.

When F19.00=0.0s, after the power off then power-on, inverter will not start

automatic. F19.00

0.0s, after the power off then power-on again, if all is ready,

inverter will run automatically with the start method defined by F02.00 after

waiting the time defined by F19.00.

Conditions for repower-on after power-off: it should be in the

running status before power-off; there’s no fault and running signal

maintained when power-on again; there’s no other factors which

Note

affect normal starting.

Range: 0～10

F19.01

Fault self-recovery times

(0 indicates no self-recovery

0

function)

Fault self-recovery interval

F19.02

Range: 0.5～20.0s

5.0s

time

When the inverter is running, because of fluctuation of load, faults may happen in

some case and it will top to output. In order not to stop the operation of equipment,

choosing the recovery functions No alarm, stop in stopping mode. Inverter will

recovery to run with speed-checking restart style, within the setting time, if inverter

cannot run, then fault protection will begin, stop running. No alarm, when the self

recovery times of fault are set to 0, self recovery function stops.

1.When using fault self recovery function, and make sure the

equipment is permitted and inverter do not enter fault.

2.Self recovery function have the effect on power-on terminal

protection, clock fault. overload and over-heated, output

!

short-circuit, short circuit to ground ,and the lack-voltage when

running of fault Protection is disabled.

3.When F19.00 0,open stop and restart function. We can start this

equipment without operators, so be careful to use this function.

Motor overload protection

F19.03

Range: 0～2

2

action selection

When the AC motors is overloaded , this mode of Protection will happen.

195

7 Detailed function specification

0: Alarm, continue operation; It happens with only warning, no motor

overload Protection characteristic (used cautiously, at this time, inverter has nothing to

do with load motor for overload protection;

1: Alarm, Stop according to the stop mode;

2: Fault, Free stop. When it is overloaded , the output of inverter is block , this

AC motor free stop .

Motor overload protection

Range: 20.0～200.0%

F19.04

150.0%

coefficient

（Motor rated current）

In order to apply effective overload protection to different kinds of motors, the

Max output current of the drive should be adjusted as shown in Fig. 7-44.

Time

Warning level

Output current

60Min

(F19.06)

F19.04=50%

F19.04=100%

Yi

1Min

valid

valid

Current

Time

55%

110%

150%

(G)

F19.07

F19.07

105%

120%

(P)

Fig.7-44 Electronic thermal relay protection Fig.7-45 Overload alarm

This adjustable value can base on the user’s setting. In the same condition, if the

AC motor is overloaded and need the fast protection, then decrease F19.04, or else

increase.

Inverter overload pre-alarm

F19.05

Range: 0,1

0

detection selection

0: Detection all the time. during the working process of inverter , it still

work after detecting overload situation.

1: Enable only constant speed detection. Only the inverter work in a

constant speed mode, it still works after detecting overload situation.

Inverter overload pre-alarm

Range: 20～180%

F19.06

130%

detection level

(Inverter rated current)

Inverter overload pre-alarm

F19.07

Range: 0.0～20.0s

5.0s

delay time

If output current higher parameter F19.06,the set electrical level will go though

delay time of F19.07,open collector will output enabled signal (please refer to

fig7-45 and parameter list F09.00~F09.03).

196

7 Detailed function specification

Motor underload

Range: 0.0～120.0%

F19.08

50.0%

alarm detection level

(Motor rated current）

Motor underload

F19.09

Range：0.1～60.0s

2.0s

alarm detection time

The output current Inverter will lower than Underload alarm detection level

F19.08 (definite the value, comparing to motor rating current ) , and the last time

will over motor underload alarm detection level time F19.09,then Yi will output

underload alarm Signal .

Motor underload

Range: units digit: 0～2

F19.10

00

alarm detection action

tens digit: 0～2

Units digit: detection selection.

0: No detection.

1: The operation has been detected all the time. This detection is enabled

during the running process of inverter.

2: Detect in constant speed mode only. This detection is enabled during the

constant speed mode only.

Tens digit: action selection.

0: when it’s in alarm, continue operation. inverter will only warn when

detecting motor is underload alarm

1: Alarm, Stop according to the stop mode

2: Fault, Free stop .The inverter will detect motor is in underload alarm, and

it will lock PWM output, the motor will stop with free rotation.

Range: units digit: 0,1

Input & output phase loss,

tens digit: 0,1

F19.11

short circuit detection

1111

hundreds digit: 0,1

action

thousands digit: 0,1

Units digit: input phase failure protect

0: No detection.

1: Fault, Free stop .When inverter detect that the input is lacked one phase,

alarm in input lacked, alarm, and free stop.

Tens digit: output phase failure protection

0 : No detection.

1:Fault, Free stop .When inverter detect that the output is lacked one phase,

alarm in input lacked, then Free stop.

Hundreds digit: power-on will detect Short circuit protection.

0: No detection.

1: Fault, Free stop. When inverter is power-on, the output to earth is

short-circuiting. At this time, the fault of short-circuiting to earth while power on

is alarmed, the inverter freely stops.

Thousands digit: The detection to earth Short circuit protection in the running

197

7 Detailed function specification

mode.

0: No detection.

1: Fault, Free stop. When inverter is power-on, the output to earth is

short-circuiting during the running process. At this time, the fault of

short-circuiting to earth while running is alarmed, the inverter freely stops.

F19.12

Overvoltage stall selection

Range: 0,1

1

0: Disabled.

1: Enabled

Overvoltage stall protection

F19.13

Range: 120～150%

125%

voltage

During deceleration, the motor’s decelerate rate may be lower than that of drive’s

output frequency due to the load inertia. At this time, the motor will feed the

energy back to the drive, resulting in the voltage rise on the drive's DC bus. If no

measures taken, the drive will trip due to over voltage.

During the deceleration, the drive detects the bus voltage and compares it with the

over voltage point at stall defined by F19.13. If the bus voltage exceeds the stall

over-voltage point, the output frequency of the inverter will stop decreasing.

When the bus voltage become lower than the point, then run slowly, as shown in

Fig. 7-46.

Overvoltage

point at stall

Time

Output freq.

Time

Fig. 7-46 Over-voltage at stall

Automatic current limit

F19.14

Range: 110～230%

170%

level

Frequency decline rate of

F19.15

Range: 0.00～99.99Hz/s

10.00Hz/s

automatic current limit

Automatic current limit

F19.16

Range: 0,1

0

action selection

0: Constant speed disabled.

1: Constant speed enabled.

Auto current limiting function is used to limit the load current smaller than the

198

7 Detailed function specification

value defined by F19.14 in real time. Therefore the drive will not trip due to surge

over-current. This function is especially useful for the applications with big load

inertia or big change of load.

F19.14 defines the threshold of auto current limiting. It is a percentage of the

drive’s rated current.

F19.15 defines the decrease rate of output frequency when the drive is in auto

current limiting status.

If F19.15 is set too small, overload fault may occur. If it is set too big, the

frequency will change too sharply and therefore, the drive may be in generating

status for longtime, which may result in overvoltage protection.

Auto current limiting function is always active in Acc or Dec process. Whether

the function is active in constant speed operating process is decided by F19.16.

F19.16=0 Auto current limiting function is disabled inconstant speed operating

process;

F19.16=1 Auto current limiting function is enabled inconstant speed operating

process;

In auto current limiting process, the drive’s output frequency may change;

therefore, it is recommended not to enable the function when the drive’s output

frequency is required stable.

F19.17

Rapid current-limiting coefficient

Range: 150%～250%

230%

The rapid current limit function can reduce the AC drive's over-current faults at

maximum, guaranteeing uninterrupted running of the AC drive. If the AC drive is

in a rapid current limit state for a long time, the AC drive may be overheated or

overloaded for further protection.

The lower the setting of the F19.17, the more sensitive the rapid current limit is.

When the F19.17 equals 250%, the rapid current limit function is invalid.

Motor run section selection

F19.18

Range: 0,1

0

when instant power off

0: disabled

1: enabled

Frequency droop rate when

F19.19

Range: 0.00～99.99Hz/s

10.00Hz/s

instant power off

Voltage rebound estimate

F19.20

Range: 0.00～10.00s

0.10s

time when instant power off

Action estimate voltage

F19.21

Range: 60～100%

80%

when instant power off

Allowed the longest off time

F19.22

Range: 0.30～5.00s

2.00s

when instant power off

199

7 Detailed function specification

Bus voltage

F19.20

F19.21

Time

Run freq.

DecelerationAcceleration

Time

time

time

Run freq

F19.22

Time

Fig 7-47 AC drive action diagram upon instantaneous power failure

Upon instantaneous power failure or sudden voltage dip, the DC bus voltage of

the AC drive reduces. This function enables the AC drive to compensate the DC

bus voltage reduction with the load feedback energy by reducing the output

frequency so as to keep the AC drive running continuously.

If F19.18 = 1, upon instantaneous power failure or sudden voltage dip, the AC

drive decelerates. Once the bus voltage resumes to normal, the AC drive

accelerates to the set frequency. If the bus voltage remains normal for the time

exceeding the value set inF19.20, it is considered that the bus voltage resumes to

normal.

When instantaneous power failure happens, if the time is exceed the time of

F19.22 definite, inverter No alarm, stop in stopping mode Free stop.

Terminal external device

F19.23

Range: 0～2

2

fault action selection

0: Alarm, continue operation .When inverter checked that Terminal of the

external is no alarm, stop in stopping mode enabled, it will alarm, then run

continue. Under this mode, the inverter will do nothing with Terminal of the

external in No alarm, stop in stopping mode, so please cautiously use.

1: Alarm, Stop according to the stop mode. When Inverter detect terminal

outside fault is enabled, alarm, and then press Stop in stopping mode.

2: Fault, Free stop .When inverter detect terminal external fault is enabled,

200

7 Detailed function specification

alarm for external equipment fault, and free stop.

Power on terminal protection

F19.24

Range: 0,1

0

selection

0: Disabled.

1: Enabled.

When setting power down and then restart function is enabled, this function is

disabled. When the running command channel is terminal command, and when

power-on and detection run the command is enabled, it will get terminal

protection with faults, this function only is enabled for terminal FWD/REV

function.

F19.25

Provide lost detection value

Range: 0～100%

0%

F19.26

Provide lost detection time

Range: 0.0～20.0s

0.5s

When setting PID is lower than F19.25 definition continuous(setting the Max. as

base), and the constant time is over than the time that F19.26 definition detected,

then PID setting will lost, inverter will run base on F19.31 Units place

set.PID

loss detection show on fig 7-48.

F19.27

Feedback lost detection value

Range: 0～100%

12%

F19.28

Feedback lost detection time

Range: 0.0～20.0s

0.5s

When the feedback value of PID is lower than F19.27 definite(setting the input as

base, and the constant time is over than the time that F19.28 definition detected,

then PID setting will lost.

Inverter will run base on F19.31 Tens place set.PID loss detection show on fig

7-48.

Deviation magnitude

F19.29

Range: 0～100%

50%

abnormal detection value

Deviation magnitude

F19.30

Range: 0.0～20.0s

0.5s

abnormal detection time

When the Error amount of PID is higher than F19.29 definite(setting the input as

base, and the constant time is over than the time that F19.30 definition detected,

then PID setting will lost. inverter will run base on F19.31 hundred’s place

set.PID loss detection show on fig 7-48.

201

7 Detailed function specification

Close loop value

(setting, feedback, error value)

The detection

value

Less than detection timeNo detection

more than detection time

No alarm when detection

Failure alarm when detection

Time

Fig. 7-48 Closed loop detection timing diagram

Range: units digit: 0~3

Protection action

F19.31

tens digit: 0~3

000

selection 1

hundreds digit: 0~3

This parameter definite the Internal PID controls the action selection of the setting

loss and the fault Error amount. When it’s set as 0 OR 1, inverter will have no

response. And with no protection selection, users should set this parameter basing

on the actual applications.

Units digit: setting PID lost motion detection.

0: no detection.

1: Alarm, continue operation

2: Alarm, Stop according to the stop mode

3: Fault, Free stop.

Tens digit: PID feedback for lost motion detection.

0: no detection.

1: Alarm, continue operation.

2: Alarm, Stop according to the stop mode.

3: Fault, Free stop.

Hundreds digit: The amount of error fault for PID detection operation

0: no detection.

1: Alarm, continue operation

2: Alarm, Stop according to the stop mode

3: Fault, Free stop.

202

7 Detailed function specification

fault state, make sure that users will know about the inverter’s potential faults.

Continuous run frequency

F19.36

Range: 0～3

0

selection when alarm

This parameter defines the run frequency when users choose “Alarm, continues to

run” for the inverter’s failure.

0: running at the current setting frequency.

1: running at the upper limiting frequency.

2: running at the lower limit frequency.

3: running at the fault Alternate frequency.

Abnormal standby

Range: 0.00Hz~upper limit

F19.37

10.00Hz

frequency

frequency

This parameter definite the alternative running frequency when inverter fault ,

user can use it along with parameterF19.36.

Disconnection testing

Range: 0.0～8.0s

F19.38

0.0s

time of encoder

(No detection while at 0）

When the inverter runs with the closed-loop vector mode，the detection starts

while the run frequency is higher than 1Hz, when the A,B-phase signal of the

encoder continues for the time set in F19.38, and no feedback has been received,

then the inverter alarms the fault of E-37 and freely stop.

Overspeed detection

Range: 0.0～120.0%

F19.39

120.0%

value

(equals upper limit frequency)

Overspeed detection

Range: 0.00～20.00s

F19.40

0.00s

time

(no detection while at 0)

Under the open-loop or the closed-loop vector mode, when it was detected that the

motor rotational speed is higher than the setting value of F19.39, and after the

continue time of F19.40’s setting value, the inverter alarms fault of E-38 and

freely stop. No detection when F19.40 equals 0, but detection is still available

when F19.39 equals 0.

Detection value of too

Range: 0.0～50.0%

F19.41

10.0%

large speed deviation

(equals upper limit frequency)

Detection time of too

Range: 0.00～20.00s

F19.42

0.00s

large speed deviation

（no detection while at 0）

Under the open-loop or the closed-loop vector running mode, when it was

detected that the difference of motor rotational speed and setting rotational speed

equals the setting value of F19.41, and after the continue time of F19.42’s setting

value, the inverter alarms fault of E-39 and freely stop. No detection when F19.42

equals 0, but detection is still available when F19.41 equals 0.

204

7 Detailed function specification

7.21 Internal Virtual Input Output Node Parameter Group: F20

F20.00

Virtual input VDI1 function selection

Range: 0～90

0

F20.01

Virtual input VDI2 function selection

Range: 0～90

0

F20.02

Virtual input VDI3 function selection

Range: 0～90

0

F20.03

Virtual input VDI4 function selection

Range: 0～90

0

F20.04

Virtual input VDI5 function selection

Range: 0～90

0

VDI1 to VDI5 have the same functions as Xi terminals on the control board and

can be used for digital input. For more details, see description of F08.18 to F08.25.

The realization of the function set by internal virtual terminal must be based on

the available terminal function.

F20.05

Virtual output VDO1 function selection

Range: 0～60

0

F20.06

Virtual output VDO2 function selection

Range: 0～60

0

F20.07

Virtual output VDO3 function selection

Range: 0～60

0

F20.08

Virtual output VDO4 function selection

Range: 0～60

0

F20.09

Virtual output VDO5 function selection

Range: 0～60

0

VDO functions are similar to the Yi functions on the control board. The VDO can

be used together with VDIx to implement some simple logic control.

If VDO function is set to non-0, the function setting and use of VDOx are the

same as the output of parameter of Yi. Please refer to descriptions in group F09.

Virtual output VDO1 open

F20.10

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO2 open

F20.11

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO3 open

F20.12

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO4 open

F20.13

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO5 open

F20.14

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO1 close

F20.15

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO2 close

F20.16

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO3 close

F20.17

Range: 0.00～600.00s

0.00s

delay time

Virtual output VDO4 close

F20.18

Range: 0.00～600.00s

0.00s

delay time

206

7 Detailed function specification

Virtual output VDO5 close

F20.19

Range: 0.00～600.00s

0.00s

delay time

F20.10~ F20.19 definite the time of open up and shut down terminal

VDO1~VDO5 definite is the delay time of internal level from open up to shut

down.

F20.20

Virtual input VDI enable control

Range: 00～FF

00

Parameter F20.20 is to control VDI1~VDI5 is enable. F20.20(BIT0-BIT4) is

according to the enable unit VDI1~VDI5,0 stands for disabled , 1 stands for

enable. The relations are below:

tens

units

BIT0: VDI1 enable control unit

BIT1: VDI2 enable control unit

BIT2: VDI3 enable control unit

BIT3: VDI4 enable control unit

BIT0:VDI5 enable control unit

F20.21

Virtual input VDI status digital setup

Range: 00～FF

00

Virtual input terminal VDI state is determined by the VDI F20.21 definite virtual

input VDI state Digital and virtual output terminal VDO state, the relation

between them is logical OR.

Parameter F20.21 BIT0-BIT4 is according to VDI1-VDI5 state, 0 stands for

disabled state, 1 stands for enabled state.

F20.22

Virtual input: output connection

Range: 00～FF

00

Bit0 : The connection of VDI1 and VDO1

0 : positive logic.

1 : negative logic.

Bit1 : The connection of VDI2 and VDO2

0 : positive logic.

1 : negative logic.

Bit2 : The connection of VDI3 and VDO3

0 : positive logic.

1 : negative logic.

Bit3 : The connection of VDI4 and VDO4

0 : positive logic.

1 : negative logic.

Bit4 : The connection of VDI5 and VDO5

207

7 Detailed function specification

7.22 Reserved parameter group 2:F21

F21.00

～

Reserved

F21.21

7.23 Reserved parameter group 3:F22

F22.00

～

Reserved

F22.17

7.24 Reserved parameter group 4:F23

F23.00

～

Reserved

F23.17

7.25 Reserved parameter group 5:F24

F24.00

～

Reserved

F24.13

209

7 Detailed function specification

7.26 User Definition Display Parameter Group: F25

F25.00

User function code 1

Range: F00.00～F25.xx

25.00

F25.01

User function code 2

Range: F00.00～F25.xx

25.00

F25.02

User function code 3

Range: F00.00～F25.xx

25.00

F25.03

User function code 4

Range: F00.00～F25.xx

25.00

F25.04

User function code 5

Range: F00.00～F25.xx

25.00

F25.05

User function code 6

Range: F00.00～F25.xx

25.00

F25.06

User function code 7

Range: F00.00～F25.xx

25.00

F25.07

User function code 8

Range: F00.00～F25.xx

25.00

F25.08

User function code 9

Range: F00.00～F25.xx

25.00

F25.09

User function code 10

Range: F00.00～F25.xx

25.00

F25.10

User function code 11

Range: F00.00～F25.xx

25.00

F25.11

User function code 12

Range: F00.00～F25.xx

25.00

F25.12

User function code 13

Range: F00.00～F25.xx

25.00

F25.13

User function code 14

Range: F00.00～F25.xx

25.00

F25.14

User function code 15

Range: F00.00～F25.xx

25.00

F25.15

User function code 16

Range: F00.00～F25.xx

25.00

F25.16

User function code 17

Range: F00.00～F25.xx

25.00

F25.17

User function code 18

Range: F00.00～F25.xx

25.00

F25.18

User function code 19

Range: F00.00～F25.xx

25.00

F25.19

User function code 20

Range: F00.00～F25.xx

25.00

F25.20

User function code21

Range: F00.00～F25.xx

25.00

F25.21

User function code 22

Range: F00.00～F25.xx

25.00

F25.22

User function code 23

Range: F00.00～F25.xx

25.00

F25.23

User function code 24

Range: F00.00～F25.xx

25.00

F25.24

User function code 25

Range: F00.00～F25.xx

25.00

F25.25

User function code 26

Range: F00.00～F25.xx

25.00

F25.26

User function code 27

Range: F00.00～F25.xx

25.00

210

7 Detailed function specification

F25.27

User function code 28

Range: F00.00～F25.xx

25.00

F25.28

User function code 29

Range: F00.00～F25.xx

25.00

F25.29

User function code 30

Range: F00.00～F25.xx

25.00

This parameter is the User-defined parameter, user can choose the at most 30 from

F0 to F30 that are reflect into F25, in order to check and alter more convenient.

Use F25.00 setting the first function code parameter that users plan to. then use

F25.01 setting the second function code parameter that users plan to, so after the

maximum 30 User-defined parameter that can define is finished, then setting

F00.00=3(user list view, press

.If users want to drop out user-defined

parameter mode, setting F00.00 3,then press.

For example: user plan to set three User-defined parameter :F02.01,F03.02 和

F04.00 , following the steps below :

⑴Use F25.00 to set the first function code parameter02.01, press

;

⑵Use F25.01 to set the second function code parameter03.02, press

;

⑶Use F25.02 to set the third function code parameter04.00, press

⑷Set F00.00=3(user list view, press

).

After the setting is finished , if users do not change F00.00 function code, when

enter function code display state, the operation panel will display

F00.00,F02.01,F03.02 and F04.00 only, if the user do not want to display

User-defined parameter, setting F00.00 to the display expected mode.

1. xx represent function code.

2.F25.xx represent no reflection.

Note

When the setting function parameter is not available into the

range of EN500/EN600 permit, setting the User-defined parameter

Note

will not make effective.

211

7 Detailed function specification

7.27 Fault Record Function Parameter Group: F26

F26.00

The last fault record

Range: 0～50

0

F26.01

The last two fault records

Range: 0～50

0

F26.02

The last three fault records

Range: 0～50

0

F26.03

The last four fault records

Range: 0～50

0

0:No fault.

1～26: E-01～E-26 fault.

27～29: Reserved.

30～39: E-30～E-39 fault.

40～50: Reserved.

F26.00~F26.03 definite the four times previous four code of faults and the two

times previous fault for the voltage, current terminal and etc of inverter , users

base on fault code and refer to fault function& fault handle process, then getting

the results for different types of fault and reasons.

Setup frequency at the

Range:0.00Hz～upper limit

F26.04

0.00Hz

last one fault

frequency

Output frequency at the

Range:0.00Hz～upper limit

F26.05

0.00Hz

last one fault

frequency

Output current at the last

F26.06

Range: 0.0～6553.5A

0.0A

one fault

DC bus voltage at the last

F26.07

Range: 0.0～6553.5V

0.0V

one fault

Module temperature at

F26.08

Range: 0～125℃

0℃

the last one fault

Input terminal status at

F26.09

0

the last one fault

Accumulated run time at

F26.10

Range: 0～65535min

0min

the last one fault

Setup frequency at the

Range:0.00Hz～upper limit

F26.11

0.00Hz

last two fault

frequency

Output frequency at the

Range:0.00Hz～upper limit

F26.12

0.00Hz

last two fault

frequency

Output current at the last

F26.13

Range: 0.0～6553.5A

0.0A

two fault

DC busbar voltage at the

F26.14

Range: 0.0～6553.5V

0.0V

last two fault

Module temperature at the

F26.15

Range: 0～125℃

0℃

last two fault

Input terminal status at

F26.16

0

the last two fault

212

7 Detailed function specification

7.28 Password and Manufacturer Function Parameter Group:

F27

F27.00

User password

Range: 00000～65535

00000

User password setting function is used for preventing unauthorized persons from

checking and modifying the functional parameters.

Set F27.00 to 00000 if the user password function is unnecessary.

If user password function is necessary, input a 5-digitnone-zero figure, and press

to confirm. The password is effective at once.

To change the password:

Press

and input the primary password, selectF27.00 (F27.00＝00000 at the

moment), then input new password and press

to confirm. The password is

effective at once.

To cancel the password：

Press

into the state of verification, and enter the original correct 5-digit

password into the state of parameter editing, then select F27.00 (F27.00=00000 at

the moment), and directly press

to confirm, the password can be canceled

Please memorize the password. Seeking advice from manufacturer

in case it is lost.

Note

F27.01

Manufacturer password

Range: 00000～65535

00000

Factory setting function, the user can't modify.

214

8 Troubleshooting

8 Troubleshooting

8.1 Failure and countermeasure

Possible failure types in EN500/EN600 are shown in Table 8-1, the fault types

including fault and alarm two kinds. Such as if inverter fault display E-XX, while

the corresponding alarm is displayed in A-XX. Once the inverter failure , fault types

are stored in the F26 fault recording parameter group, and if alarm, alarm status has

been revealed, until the alarm source release, alarm status are not logged to the F26

parameter group. Some failure code is reserved for intelligent automatic diagnosis

function which will be executed continuously in future. When failure takes place in

the inverter, the user should check according to note of these table first and record

failure phenomena detailedly. Please contact our after-sale service and technical

support Department or agent in your local place when technical service is needed.

Table 8-1 Failure type and the countermeasure

Failure

Failure type

Possible reason

Countermeasure

code

Accelerating time is too

Prolong accelerating time

short

Adjust V/F curve setting，adjust

Improper V/F curve

manual torque boost or change to

automatic torque boost

Overcurrent during

Restart rotating motor

Set speed checking restart function

E-01

accelerating

process

Low power source voltage

Check input power supply

Too small power of the

Choose inverter with high-power

inverter

Output phase lose under

Check whether the motor wiring is

vector control

in good condition

Decelerating time is too

Prolong decelerating time

short

Increase braking power of external

Overcurrent during

Have potential energy load

energy consumption braking

E-02

decelerating

or big Inertia load

subassembly

process

Power of inverter is a bit

Choose inverter with high-power

small

Load change suddenly or

Check or reduce saltation of the

have unwonted phenomena

load

Acc./Dec. time is set to too

Prolong accelerating /decelerating

Overcurrent during

short

time properly

E-03

constant

speed

process

low power source voltage

Check input power supply

Power of inverter is a bit

Choose inverter with high-power

small

E-04

Overvoltage

Unwonted input voltage

Check input power supply

during accelerating

process

Acc. time is set to too short

Prolong accelerating time properly

215

8 Troubleshooting

Restart rotating motor

Set speed checking restart function

Decelerating time is too

Prolong decelerating time

Overvoltage during

short

E-05

decelerating

Increase braking power of external

Have potential energy load

process

energy consumption braking

or big inertia load

subassembly

Unwonted input voltage

Check input power supply

Acc/Dec time is set to too

Prolong accelerating decelerating

Overvoltage during

short

time properly

E-06

constant

speed

Input voltage change

process

Assemble reactor

abnormally

Use energy consumption

Load inertia is a bit big

subassembly

Inverter control

Check input power supply or look

E-07

power supply

Unwonted input voltage

for service

overvoltage

Low-voltage when

E-08

Input voltage is too low

Check the input voltage

running

Acc time is set to too short Prolong accelerating time

DC injection braking is too

Reduce DC injection braking

big

current，prolong braking time

Inverter overload

improper V/F curve

Adjust V/F curve and torque boost

E-09

protection

Restart rotating motor

Set speed checking restart function

power source voltage is too

check power source voltage

low

Load is too big

Choose inverter with high-power

Improper V/F curve

Adjust V/F curve and torque boost

Power source voltage is too

check power source voltage

low

General motor run at low

Can choose frequency conversion

E-10

Motor overload

speed with big load

motor for long time low speed run

（A-10）

protection

Motor overload protection

to set motor overload protection

factor set incorrectly

factor correctly

Motor blocked up or load

change too suddenly and

Check the load

quickly

The operating current of

Confirm whether the parameters

inverter less than underload

F19.08,

F19.09 setting

are

E-11

Motor underload

threshold

reasonable

（A-11）

protection

Checking whether the load divorced

load divorced from motor

from motor

The input phase

The three-phase input

Check the three-phase input power

E-12

lose

power supply is abnormal

line is off or poor contact

216

8 Troubleshooting

Power

supply

board

Look for service from manufacturer

anomaly

or agent

Look for service from manufacturer

The control board anomaly

or agent

Anomaly wire between

Check the motor wire

motor and inverter

When the motor runs

Check whether the motor

inverter three-phase output

The output

three-phase winding is balance

E-13

unbalanced

phase lose

Power

supply

board

Look for service from manufacturer

anomaly

or agent

Look for service from manufacturer

The control board anomaly

or agent

Transient overcurrent of the

Refer to countermeasure for

inverter

overcurrent

phase to phase short circuit or

earthing short circuit of

wiring again

output 3 phase

Air-path blocked or fan

To clear air-path or replace the fan

damaged

Ambient temperature is too

Lower ambient temperature

high

Inverting module

Connecting wire or insert

E-14

Check and connect the wire again

protection

on control board loose

Unwonted current wave

caused by missing output

Check wiring

phase etc.

Assistant power supply

Look for service from manufacturer

damaged and drive voltage

or agent

lacking

Look for service from manufacturer

Unwonted control board

or agent

Motor short circuit to

The replacement of cable or motor

ground

Short circuit to

E-15

ground when

Hall component is damaged

operation

or the hall wiring is poor or

Look for service from manufacturer

the current detection circuit

or agent

is abnormal

Motor short circuit to

Change the cable or motor

ground

Short circuit to

The power supplier of the

E-16

ground when

inverter and the motor

Change the cable or motor wiring

power on

wiring are reversed

Hall component is damaged

Look for service from manufacturer

or the hall wiring is poor

or agent

E-17

Continuous alarm on A-17

Cleaning or to improve the

Inverter overheat

（A-17）

for more than 30 minutes

ventilation duct

Cleaning or to improve the

Duct blockage

ventilation duct

217

8 Troubleshooting

To improve the ventilation

The ambient temperature is

conditions, decreasing the carrier

too high

frequency

Fan damage

Change new one

External fault emergency

Open external failure terminal after

stop terminal closed

external failure is settled

E-18

External device

Sudden stop terminal for

Open external failure terminal after

（A-18）

failure

external failure closed

external failure is settled

Connecting wire or insert

Check and connect the wire again

on control board loose

Assistant power supply

Look for service from manufacturer

Current detecting

damaged

or agent

E-19

circuit failure

Look for service from manufacturer

Hall component damaged

or agent

Unwonted

amplifying

Look for service from manufacturer

circuit

or agent

The interruption protection

of CPU is triggered, but

Press "STOP/RESET" button to

External

none of

the

actual

E-20

reset or add external power supply

interference failure

overcurrent,

overvoltage

filter from power input side

and short circuit signals

have been detected

Power off and restart, if the failure

Internal

E-21

Internal disturbance serious

persists, seek the manufacturer or

interference failure

dealer service

PID given loss threshold

To reset the relevant parameters

setting is not reasonable

E-22

External

given

PID given loss

Check external given wiring

（A-22）

disconnection

Look for service from manufacturer

The control board anomaly

or agent

PID feedback loss threshold

To reset the relevant parameters

setting is not reasonable

E-23

Feedback signal

Check external feedback signal

PID feedback loss

（A-23）

disconnection

wiring

Look for service from manufacturer

The control board anomaly

or agent

PID

error

abnormal

detection threshold setting

To reset the relevant parameters

E-24

PID error

is not reasonable

（A-24）

amount abnormal

Look for service from manufacturer

The control board anomaly

or agent

Start terminal

Terminal

command

Check the external input terminal

E-25

protection

effective when power on .

state

E-26

Communication

Baud rate set improperly

set Baud rate properly

（A-26）

failure

Serial port communication

Press “STOP/RESET” key to reset，

error

look for service

Failure warning parameter

Modify F05.04, F05.05

set improperly

218

8 Troubleshooting

Check if upper device work and

Upper device doesn’t work

wiring is correct

E-27

Reserved

E-28

Reserved

E-29

Reserved

E²PROM read

Mistake take place when

Reset by pressing “STOP/RESET”

E-30

and write

read or write control

Look for service from manufacturer

（A-30）

wrongly

parameter

or agent

Look for service from manufacturer

Temperature

Temperature sensor fault

or agent

E-31

detecting

The temperature detection

Look for service from manufacturer

disconnection

circuit anomaly

or agent

Parameter

setting

not

set parameter correctly according

according to the motor

to the motor nameplate

nameplate

E-32

Self tuning failure

current

anomaly when

Select inverter match the motor

tuning

Motor wiring error

Check the motor three-phase wiring

Look for service from manufacturer

E-33

Power board anomaly

Contactor anomaly

or agent

（A-33）

Contactor anomaly

Replace contactor

E-34 The factory fault 1

Debugging use in factory

E-35 The factory fault 2

Debugging use in factory

Improve

the

inverter

heat

Poor cooling environment

dissipation environment

The bus

E-36

The inverter capacity is too

capacitor

Select inverter match motor

（A-36）

small

overheating

Bus capacitance cooling fan

Replace the bus capacitor cooling

is damaged

fan

Encoder

Damaged encoder or poor

E-37

Check the wiring or the encoder

disconnection

wiring

Short acceleration time

Prolong the acceleration time

Low inverter power

Select high-power inverter

Overspeed

E-38

Overspeed detect parameter

protection

Set the parameter properly

F19.39 and F19.40 is set

according to the situation

improperly

Short Acceleration/

Prolong the acceleration time

deceleration time

Low inverter power

Select high-power inverter

Large speed

E-39

deviation

Over velocity

protection

misalignment. Parameter

Set the parameter properly

F19.41 and F19.42 is set

according to the situation

improperly

E-40

～

Reserved

E-50

The main and

auxiliary

F01.00 and F01.03 cannot be set to

given frequency

A-51

Parameter setting error

the same channel

(9: terminal

channel

encoder given except)

exclusiveness

alarm

219

8 Troubleshooting

Terminal

Terminal

function

function

A-52

parameters

Check the terminal function settings

exclusiveness

setting repeatedly

alarm

The details, see 5.2.6 keypad lock

LOCH1.

Keypad lock

Keypad lock

operation

8.2 Failure record lookup

This series inverter can record latest 4 failure code and inverter run parameter of the

last 2 times failure, refer to these information can redound to finding out reason of

the failure.

Failure information is all stored in F26 group parameter，please enter into F26 group

parameter to see about information by referring to keypad operation method.

Code

Content

Code

Content

Input terminal state at previous

F26.00

Previous one failure record

F26.09

failure

F26.01

Previous two failure record

F26.10

Running time at previous failure

F26.02

Previous three failure record

F26.11

Set freq. at previous 2 failure

F26.03

Previous four failure record

F26.12

Output freq. at previous 2 failure

Output current at previous 2

F26.04

Set freq. at previous failure

F26.13

failure

F26.05

Output freq. at previous failure

F26.14

DC bus volt. at previous 2 failure

Module temp. at previous 2

F26.06

Output current at previous failure

F26.15

failure

F26.1

Input terminal state of previous 2

F26.07

DC bus volt. at previous failure

6

failure

F26.1

Running time of previous 2

F26.08

Module temp. at previous failure

7

failure

8.3 Failure reset

1. Before reset you must find out reason of failure downright and

eliminate it,

otherwise may cause permanent damage to the inverter.

2. If can’t reset or failure takes place again after resetting, should

look for reason and continuous resetting will damage the inverter.

3. Reset should take place 5 minutes later after overload, overheat

!

protection action.

4. For the fault of E-14, the reset is invalid, the motor wiring should

be checked after power off, and restart the inverter.

5. When there is a fault of E-16 after power on, do not directly run

the inverter after reset, and need to check whether the input，out

wiring are reversed.

220

8 Troubleshooting

To resume normal running when failure takes place in the inverter, you can choose

following any kind of operation:

(1) After you set any terminal of X1~X8 to be inputted by external RESET, it

will be reset after connected to COM.

(2) When failure code is displayed，press

key after confirmed that it

can be restoration.

(3) Communication reset. Please refer to annex description.

(4) Cut off power supply.

8.4 Alarm reset

When an alarm occurs, must eliminate alarm source which cause alarm, otherwise

the alarm cannot be eliminated, also cannot be reset by reset button.

221

9 Maintenance

9 Maintenance

9.1 Routine maintenance

When you use this series you must assemble and operate it according to demand

listed in this “service manual” strictly. During run state, temperature, humidity,

vibration and aging parts will affect it, which may cause failure of the inverter. To

avoid this, it is recommended to perform routine inspections and maintenance.

Table 9-1 Daily inspection and maintenance items

Period

Inspection item

Daily

Periodic

Daily cleaning:

(1)Inverter should be maintained in a clean state

√

(2)Clean up the dust on the surface of inverter, prevent the dust into the

inverter internal (especially metal dust).

(3)Clean up the oil stain of cooling fan

√

Check the air duct, and regularly clean.

√

Check whether the screws is loose

√

Check whether the inverter is corrode

√

Whether inverter installation environment changes

√

Whether the inverter cooling fan is working properly

√

Whether the inverter is overheating

√

When running whether voice of motor abnormal change.

√

Whether occur abnormal vibration when motor running

√

Check wiring terminals have arc trace

√

The main circuit insulation test

Recommend to inspect with following instrument:

Input voltage: electric voltmeter；output voltage: rectifying voltmeter；input output

current: pincers ammeter.

9.2 Inspection and replacement of damageable parts

Some component parts in the inverter will be abraded or bear descending

performance for long-term usage，to assure that the inverter can run stably and

reliably, it is recommended to perform defending maintenance and replace

corresponding parts if necessary.

222

Appendix A Modbus communication protocol

Appendix A Modbus communication protocol

A.1 Summary

We provide general RS485 communication interface in our inverters for the user.

Through this communication interface upper device (such as HMI, PC, PLC

controller and etc.) can perform centralized monitor to the inverter (such as to set

inverter parameter, control run of inverter, read work state of the inverter).

This communication protocol is interface criterion file designed for realizing

above-mentioned function, please read it earnestly and program according to it so

that realize long-distance and network control to the inverter.

A.2 Communication net buildup mode

mainframe is PC

or

mainframe is PLC

RS232

232-485 conversion

module

RS485

EN600

EN600

EN500

EN500

Fig.A-1 net buildup graph

A.3 Communication mode

At present, EN500/EN600 inverter can be used only as Slave device in RS485 net.

Can realize communication between inverters through PC, PLC or HMI if it’s

needed. Specific communication mode is as mentioned below:

(1) PC or PLC as mainframe，inverter as Slave device, point-to-point

communication between mainframe and Slave device.

(2) Slave device don’t response when mainframe send out command by broadcast

address.

(3) User can set local address, baud rate and data format of the inverter through

Slave device keypad or serial communication mode.

(4) EN500/EN600 provides the RS485 interface.

(5) Default mode: Asynchronous serial，semiduplex transport mode. There are

RTU and ASII two mode . Default format and transport rate: 8-N-1, 9600bps.

225

Appendix A Modbus communication protocol

A.4 Transmission mode

Asynchronous serial, semiduplex transport mode. Default format and transport

rate: 8-N-1, 9600bps. The detail setting parameter, please refer to the F05 group

function mode.

(Remark: the parameter is valid under the Modbus communication, the other

parameter comply with the original service manual)

F05.00

Protocol

0:Modbus protocol

1

0

×

selection

1:Reserved

2:Profibus protocol(expansion is valid)

3:CanLink protocol(expansion is valid)

4:CANopen protocol(expansion is valid)

5:free protocol 1(revision all the parameter of

EN500 is valid)

6: free protocol 2(only revising part parameter

of EN500 is valid)

Remark: expansion card is needed when select

2,3,4 communication

F05.01

Baud rate

The unit digital: free protocol and Modbus

1

005

×

setting

Baud rate selection

0:300BPS

1:600BPS

2:1200BPS

3:2400BPS

4:4800BPS

5:9600BPS

6:19200BPS

7:38400BPS

8:57600BPS

F05.02

Data format

LED the unit digital: free protocol and Modbus

00

×

protocol Data format

0:1-8-1 format，no checkout，RTU

1:1-8-1 format，Odd Parity，RTU

2:1-8-1 format，Even Parity，RTU

3:1-7-1 format，no checkout，ASCII

4:1-7-1 format，Odd Parity，ASCII

5:1-7-1 format，Even Parity，ASCII

F05.03

Local address

0～247，00 is broadcast address

1

1

×

A.5 Data communication structure

A.5.1 Data frame format

Using RTU mode, messages are sent at least 3.5 character time interval pause.

The first transmitted field is device address, the character you can transfer is

hexadecimal 0x00 ~ 0xFF. Network equipment Continuously monitor the bus,

including pauses. When the address field is received, all equipment determine

whether it is sent to their own. when the last character of the packet transfer is

complete, at least a 3.5 character times pause mean the end of the message. A new

226

Appendix A Modbus communication protocol

message can begin after this pause.

The entire message frame must be transmitted as a continuous flow. If a new

message start transmitting in less than 3.5 character times after a message and

then receiving device will consider it a continuation of the previous message. This

will cause an error, because in the final CRC field value can not be right.

RTU frame format as the table below:

Frame Header

3.5 characters time pause

Slave address

Slave address:0~247

03H:read slave parameter

Communication command code

06H:write slave parameter

Data content DATA

The contents of packet:

Parameter address(16bit);

Data content DATA

Number of parameter or bytes of parameter

……

value;

……

Parameter value(16bit)

CRC check value low byte

16bit Unsigned check value

CRC check value high byte

Closing Flag

3.5 characters time pause

Regarding generation method of CRC check value, please refer to Section A.9.

ASCII frame format as the table below:

Frame Header

‘:’(0x3A)

Slave address Hi

Slave address: Combined by 2 ASCII code

Slave address Lo

8 bit slave address 0~247

Command code: 8 bit command code

Command code Hi

combined by 2 ASCII code

03H:read slave parameter

Command code Lo

06H:write slave parameter

Data content DATA

The contents of data packet:

N pieces of 8bit data content combined by 2*N

Data content DATA

pieces of ASCII code

……

……

LRC CHK Hi

LRC check value includes 2 pieces of ASCII

LRC CHK Lo

code

Closing Flag Hi

Closing Flag Hi = CR(0x0D)

Closing Flag Lo

Closing Flag Lo = LF(0x0A)

A.5.2 Host read slave parameter

Command code 03H. Host can read one or more parameter( up to ten) by

initiating a communication transaction .

E.g., read 2 contiguous inverter parameter values from the address 0000H of

inverter whose address is 01, the contents of host command :

227

Appendix A Modbus communication protocol

ADR

01H

CMD

03H

Parameters initial address high byte

00H

Parameters initial address low byte

00H

Number of parameter high byte

00H

Number of parameter low byte

02H

CRC check value low byte

C4

CRC check value high byte

OB

The contents of slave reply:

ADR

01H

CMD

03H

Parameter value bytes

04H

Address 0000H content high byte

00H

Address 0000H content low byte

00H

Address 0001H content high byte

00H

Address 0001H content low byte

03H

CRC check value low byte

BA

CRC check value high byte

F2

A.5.3 Host write slave parameter

Command code 06H. Host can write an parameter by initiating a

communication transaction .

E.g.,The decimal system 5000 (1388H) written to the inverter 0101H address

whose slave address is 02，host command including:

ADR

02H

CMD

06H

Parameter address high byte

01H

Parameter address low byte

01H

Parameter value high byte

13H

Parameter value low byte

88H

CRC check value low byte

D4

CRC check value high byte

93

The contents of slave reply:

ADR

02H

CMD

06H

Parameter address high byte

01H

Parameter address low byte

01H

Address 0101H content high byte

13H

Address 0101H content low byte

88H

CRC check value low byte

D4

CRC check value high byte

93

228

Appendix A Modbus communication protocol

A. 6 Data communication address allocation

A.6.1 Function code F00-F26 group communication address

Inverter function parameter’s MODBUS communication address addressing

process follows PPnn way: PP means high byte of the address, corresponding to

function parameter’s group number; nn means low byte of the address,

corresponding to function code parameter’s group internal code. For example:

F3.21 function code’s communication address is 0315H, 03H is the hex form of

group number 3, 15H is the hex form of group internal code 21.

F00.00~F26.17 communication address is 0000H~1A11H, F26 group fault record

parameter start address is 1A00H.

A.6.2 control command and status word communication address

Variable

Communicat

Reading-writin

Command data or response value meaning

Name

ion address

g attribute

1: reserved

2: reserved

3: forward JOG run

4: reversal JOG run

Run

Reading and

5: run

command

1 E 00H

writing

6: stop

word

7: forward run

8: reversal run

9: fault reset

10: reserved

Serial

port

Reading and

1E 01H

0~10000(0~max)

value

writing

setting

BIT0: bus voltage set

BIT1: the ordinary run command effectively

BIT2: JOG command effectively

BIT3: Running

BIT4: the current running direction is reverse

BIT5: the operating instructions is reverse

direction

BIT6: deceleration braking

Inverter

1E 02H

Reading only

BIT7: acceleration

status

BIT8: deceleration

BIT9: alarm

BIT10: fault

BIT11: current limit

BIT12: fault self recovery

BIT13: self tuning

BIT14: Free stop State

BIT15: speed tracking start

229

Appendix A Modbus communication protocol

Alarm

0: no alarm

1E 03H

Reading only

code

1 ~ 50: the current alarm code

Modbus communication address 1E01(frequency given)can be

torque setting and pressure setting address

Note

A.6.3 Monitor parameter communication address

Communication

read-write

Variable name

Command data or response value

address

attribute

C-00

1C00H

Reading

Monitoring parameters 1

C-01

1C01H

Reading

Monitoring parameters 2

C-02

1C02H

Reading

Monitoring parameters 3

C-03

1C03H

Reading

Monitoring parameters 4

C-04

1C04H

Reading

Monitoring parameters 5

C-05

1C05H

Reading

Monitoring parameters 6

A.6.4 Inside hidden parameters

Communicatio

read-write

means of command data or response

Variable name

n address

attribute

value

Reserved

1D00H

/

Reserved

1D01H

/

Communication AO1

1D02H

read-write

Range: 0～4000

given value

Communication AO2

1D03H

read-write

Range: 0～4000

given value

Communication

1D04H

read-write

Range: 0～4000

EAO1 given value

Communication

1D05H

read-write

Range: 0～4000

EAO2 given value

Communication

1D06H

read-write

Range: 0～4000

DO given value

Communication

1D07H

read-write

Range: 0～4000

EDO given value

BIT0:Y1

BIT1:Y2

BIT2:Y3

BIT3: Y4

The communication

BIT4: RLY

output terminal given

1D08H

read-write

BIT5: EY1

value

BIT6: EY2

BIT7: EY3

BIT8: EY4

BIT9: ERLY1

BIT10: ERLY2

Communication

1D09H

read-write

BIT0:CX1

230

Appendix A Modbus communication protocol

virtual input terminal

…

given value

BIT7: CX8

Reserved

1D0AH

/

Reserved

1D0BH

/

Reserved

1D0CH

/

Reserved

1D0DH

/

A.7 Communication error processing

Inverter receiving data packet detection error, it finds reading&writing parameter

address or parameter value invalid, so reply to the host with communication error

response packet. Communication error response packet (host command code

+80H) as command code, with 1 byte error code.

Format for communication error response packet as follows:

ADR

01H

CMD

83H/86H

01H~06H (for details, please check below

Communication error code

table)

Low byte of CRC checksum

Obtain by calculating

High byte of CRC checksum

Obtain by calculating

Meaning for each communication error code value as follows:

Communication error

Communication error type

Priority

code value

0x01

CRC checksum error

1

0x02

Command code illegal

2

0x03

Register address visited illegal

3

0x04

Value to register illegal

4

0x05

Not allow to modify parameters

5

0x06

Register number read illegal

6

A.8 Data frames examples

A.8.1 RTU Mode

1. Start #1 inverter running

host

command

01

06

1E

00

00

05

4F

E1

frames

Slave

respond

01

06

1E

00

00

05

4F

E1

frames

231

Appendix A Modbus communication protocol

2. Stop #1 inverter running

host

command

01

06

1E

00

00

06

0F

E0

frames

Slave

respond

01

06

1E

00

00

06

0F

E0

frames

3. Set #1 inverter given value to 25Hz (the upper limitation frequency is

50Hz)

host

command

01

06

1E

01

13

88

D3

74

frames

Slave

respond

01

06

1E

01

13

88

D3

74

frames

4. Read #1 inverter running state

host

command

01

03

1E

02

00

01

23

E2

frames

Slave

(Respond value

respond

01

03

byte quantity)

00

01

79

84

frames

02

232

Appendix A Modbus communication protocol

A.8.2 ACSII Mode

Host read Slave，command code: 03

The host frame

The host frame format

Send

1

2

2

4

4

2

2

byte

Remark:

¾ Begin symbol:

The lower computer judge the frame header of ASCII based on this.

It is:’:’

¾ Slave address:

Single inverter ID code，range:0~247.

Thereinto, 0 is broadcast address. Broadcast address can control all

the lined Slave simultaneously，and the Slave will not send back

any Data to the host. That means the Slave only accept and do not

send.

Modbus protocol without host address.

¾ Command code:

Reading the command of parameter or data from inverter ，the

value is:’0’’3’.

¾ Register address:

The internal memory address of inverter function parameter is of 4

byte, which is ASCII mode transformed from Hexadecimal.

Corresponding relation between specific parameters and

memory address can be seen in the later table.

¾ Register number:

The number of parameters read by a frame, it is 4 byte. It is ASCII

mode transformed from Hexadecimal.

¾ Checksum:

From “slave address” to the character before checksum, the LRC

checksum of the character string. Function terminal can be seen on

the end of the text.

233

Appendix A Modbus communication protocol

¾ Ending code: enter，line break. is:0x0D,0x0A

Response frame

Response frame format

Send

1

2

2

2

N*2

2

2

byte

remark:

¾

Begin code:

The lower computer judge the frame of ASCII frame. This is :’:’

¾

Slave address:

Single inverter ID code，range:0～247.

Thereinto, address 0 is broadcast address. Broadcast address can

control all the lined Slave simultaneously，and the Slave will not

send back any Data to the host. That means the Slave only accept

and do not send.

Modbus protocol is without host address.

¾

Command code:

The command of reading parameter or data from inverter, the value

is:’0’’3’.

¾

Data byte:

The number of parameters read by a frame. It is 4 byte, which is

ASCII mode transformed from hexadecimal.

¾

Data string value:

The detail return Data，the length of Data string is the register

address

“Data byte”, which is ASCII mode transformed from

hexadecimal. Range: 4~40 byte

¾

Checksum:

From “slave address” to the character before checksum, the LRC

checksum of the character string.

The function terminal can be seen in the later text.

¾ Ending symbol: enter, line break. Is 0x0D,0x0A

The followings are the example of command frame and return frame,

all the Data are ASCII character.

234

Content      ..     4      5      6      7     ..