Cummins Onan. Energy Command 30. Manual - part 2
Page 5
Adaptive Cycle Management
The automatic modes have unique features to
minimize repeatedly starting and stopping the
genset, also called short cycling, and to pre-fill the
battery prior to the start of Quiet Time.
Limiting Short Cycling
Onan genets have a minimum run time of 10
minutes. When in the automatic modes, the EC-
30 observes the minimum run time, even if the
automatic run request has been satisfied. For
example; suppose the HVAC only needs to run for
6 minutes to cool the coach. The genset will still
continue to run for a minimum of 10 minutes
before stopping.
If a new run request is detected, during the
minimum run, the Adaptive Cycle Management
feature will limit short cycling by extending the run
time as required
The EC-30 also compares the amount of HVAC on
time to the HVAC off time. Based on this ratio, or
percentage, it will continue to run in order to avoid
short cycling. The EC-30 will turn off the genset
after 10 minutes with no run request.
Quiet Time Pre-Fill
Two hours prior to the beginning of Quiet Time the
EC-30 checks the battery level, and if the batteries
are not full, the EC-30 will start the genset to
charge the batteries.
Preventing Automatic Starting When
Connected to Shore AC
The EC-30 has an input to prevent the genset
from automatically starting when connected to
shore power. For this feature to be active the
installation must include a sensor to detect the
presence of shore power. The Installation section
of this Operation and Installation Manual describes
how this feature is installed.
Note: This is an optional feature, See Testing the
System to determine if this feature is installed.
Using the Displays
The top line of the display is used to show key
system information and the second line of the
display typically shows the genset operating
Mode. Some displays require both lines. If the
genset operating mode is not displayed, the EC-30
returns to the default display after 10 minutes.
See Figure #1 Main Display Map.
House Battery Charge Level Indicator
The house battery charge level indicator uses both
short and long term voltage trends to determine
the battery level. It is intended as a guide to the
state-of-charge (SOC) of the battery and its ability
to sustain the load. When the EC-30 is in the
automatic modes it also serves as the default
trigger points for starting and stopping the genset
to charge a low battery. The genset is started
when the bar graph only shows one segment and
stopped when three bars are displayed.
House Battery Voltage
The house battery voltage can be used to assess
the performance of the charging system and to
estimate the battery SOC. To estimate battery
SOC, no loads should be on and the battery
should not be charging. Ideally, the battery will
have “rested” in this state for 24 hours. Letting the
battery rest for 30 minutes will give an idea but the
SOC estimate will be less accurate.
Open Circuit Voltage vs. State-of-Charge
12 Volt Batteries of Various Types
Battery Electrolyte Type
State of
Charge
Liquid AGM Gelled
100% 12.6 12.9 12.8
75% 12.4 12.7 12.6
50% 12.2 12.4 12.3
25% 12.0 12.0 12.0
0% 11.8 11.8 11.8
Engine (Chassis) Battery
If a separate engine battery is wired to the EC-30
it is shown in the ENGINE Bat V display. There is
no display if this feature is not wired. This is an
optional feature.
SERVICE IN Display
The SERVICE IN display is a countdown service
hour meter that indicates the genset next required
service interval. To determine specific service
items see the genset manual. When the service
interval has elapsed the display alternates as
shown below.
SERVICE
DUE
ENTER to
Reset
Display Alternates
Press ENTER to Reset
Service Hour-Meter