Cummins Onan. Energy Command 30. Manual - part 4
Page 13
Wiring Installation
1. Use wire tags or labels to label each end of
every wire. Use Figures 5 and 6 to
determine the correct labels and
connections.
2. At the controller end of the harness, insert
the terminated and labeled wires into the
correct positions in the connector body. Use
Figures 5 and 6 to determine the correct
positions.
3. At the genset end of the harness, insert the
terminated and labeled wires into the correct
positions in the connector body. Use Figures
5 and 6 to determine the correct positions.
Use tie wraps at not less than 20-inch intervals to
keep the wire bundle neat. Use protective sheathing
where necessary to protect the wires from sharp
edges.
Genset Harness Installation
1. Route the harness from the genset to the
control panel, making sure that the
connectors on the harness match the
corresponding connectors at each end.
Wires must be protected from all hot, sharp,
and abrasive surfaces.
!CAUTION! When DC wires are run with AC
wires, electrical induction can occur and
cause operational problems. Route the
controller harness separately from AC load
wires.
2. Seal any holes where the harness passes
through bulkheads.
!WARNING! Exhaust gases are hazardous and
my cause severe personal injury or death. Seal
all holes to prevent the entrance of exhaust
gasses into the vehicle interior.
Connections (Definitions)
This section describes each connection to the EC-30.
Genset Connections
WIRE #1 BATTERY GROUND (NEGATIVE): This
wire supplies the ground or negative side of the
circuit for the EC-30. It must be supplied from the
genset.
WIRE #2 STOP OUTPUT: This wire supplies the
stop signal to the genset. It is an active low or
grounded output. It is controlled by the
STOP/START switch and in the automatic mode by
the EC-30.
Wire #3 START/PREHEAT: This wire supplies the
start/preheat signal to the genset. It is controlled by
the STOP/START switch and in the automatic mode
by the EC-30.
Wire #4 Request HVAC Active Low: This input
wire supplies a signal to the controller when the
HVAC system requires the genset to run. Typically
it is supplied from a thermostat or the HVAC system
controller. Unlike the other 3 HVAC request inputs,
see wires #10 - #12, this input is an active low or
ground input. This means it requires a transition
from +12V to ground to activate the auto-gen start
function. In contrast to the other 3 HVAC inputs
which require a transition from ground to +12V.
Wire #5 Switched B+ From Genset: This wire is
switched to the battery positive voltage when the
genset is running. It is used to provide a signal for
the genset hour meter and to indicate the genset is
running.
Wire #6 Genset Status Light: This wire supplies a
diagnostic output from the genset that flashes the
red light in the START/STOP switch to indicate a
genset fault. The status light output is decoded by
the EC-30 to display a text fault message.
Power and Voltage Connections
WIRE #7 8-35VDC Power +: This wire is the
positive power supply to the EC-30. It may be
supplied from the distribution side of the DC
disconnect if it is desirable to have all DC loads off
when the disconnect is off. It must be protected by a
5A inline fuse located as close to the battery or
source as possible. Do not install the fuse until
the installation is complete. Install fuse just
prior to testing the installation.
WIRE #8 House Battery Sense 12-24VDC: This
wire supplies the positive sense voltage to the unit
which is displayed as the house battery voltage and
is used to determine the house battery state-of-
charge indicator. It must be connected directly to the
battery. It must be protected by a 5A inline fuse
located as close to the battery as possible. Do not
install the fuse until the installation is complete.
Install fuse just prior to testing the installation.