Service manual

4. Service 9-2013
4.6.1 Generator Control
General: The generator control is an integrated microcontroller-based engine, generator and
transfer switch control. It provides all the control, monitoring and diagnostic functions required to
operate a standby generator set.
Transfer Switch Control: When a transfer switch without a built-in controller is used, all
transfer and retransfer signals come from the generator control. Transfer times are pre-set and
not adjustable. Power transfer from the utility to the genset is set at five seconds. Retransfer to
the utility is set for ten minutes. After retransfer, there is a generator cool down period of ten
minutes.
Connections: All DC control connections to the control are through connector J1. Utility sense
and control connections are through connector P7. Optional Ethernet connections are through a
Cat 5 Ethernet cable connector. Refer to the appropriate wiring diagrams and wiring harness
drawings.
Mounting: The control is mounted on the left inner panel, under the finger guard. The finger
guard and control panel each have 4 screws for mounting.
Configuration: Perform Generator Set Configuration when replacing the control board.
Software Updates: To update the control software:
1. Disconnect the harness to the in-home display at J4 before updating the control software.
Refer to the appropriate wiring diagrams for more information.
2. Connect the InPower Onan service tool harness (PN 0338-4840) to remote connector J5.
3. Hold the stop button to wake up the control.
4. Connect InPower Onan and update the software.
5. Disconnect the service tool harness and reconnect the in-home display to J4.
4.6.2 START/STOP Switch S2
Unsnap the connector from the back of the switch for access to its terminals. Replace the switch
if it does not:
• close across terminals 2 and 3 when the switch is held in the Start position
• close across terminals 1 and 2 when held in the Stop position
• the status indicator light does not light when 12 VDC is connected across terminals 7 (-)
and 8 (+)
4.6.3 Line Circuit Breaker CB1/CB2
Disconnect all wiring and check electrical continuity across the terminals of each circuit breaker.
Replace a circuit breaker that does not reset or that does not close or open as the handle is
turned ON and OFF.
4.6.4 Current Transformers CT1/CT2
The current transformers are tied to the line side of the circuit breakers with polarity dot toward
the generator.
32 A030A239 (Issue 10)