Manages the blowdown valve and the load/unload solenoid valve to regulate air generation.
| Symptom | Likely Wiring Issue (check via diagram) | |----------------------------|-------------------------------------------------------------| | Unit dead, no LEDs | L/N reversed; missing PE; external fuse blown | | Output relay clicks but load inactive | Contact wired to NC instead of NO; load voltage missing | | Erratic Modbus communication | Missing termination resistor; A/B swapped; shield grounded at both ends | | Analog input reads stuck | Signal loop broken; sensor power missing; shield grounded improperly | delcos 3100 wiring diagram
If the wiring diagram reveals no obvious faults in the CAN interface, fuses, or terminal connections, the next step is to contact an authorized service technician, as the issue may be a hardware fault within the control board or SR drive. Manages the blowdown valve and the load/unload solenoid
Connected to monitor air temperature. Pressure Transducer: Connected to monitor line pressure. Pressure Transducer: Connected to monitor line pressure
Wired to a dedicated, fail-safe digital input that immediately cuts power to the contactor coils.
The motor starter coil (labeled M1 ) connects to Output Card Slot 3, Terminal 8 . The other side of the coil goes to L2 (Neutral) . The diagram also notes: "Use snubber across M1 coil (Delcos P/N 234-01)." This is a critical detail—ignoring it can cause false triggering.