The DL3 is a generator-set controller. It is used on generator sets from Cummins/Onan, including the DL3.
| Symptom | Cause | Remedy |
|---|---|---|
| Engine cranks but does not start | K1 fuel solenoid does not energize when S11 is in Start position | Check B+ circuit through K14 to K1; check relay K14 per Checkout [E]; check K1 fuel solenoid per Checkout [F] |
| Engine does not crank | Battery dead | Check battery per Checkout [A] and recharge or replace; check battery charger operation |
| Engine starts but stops after running several seconds | Fault condition indicated by fault breaker CB12 on control panel | Check for a possible fault condition; if none, check fault monitors S1, S2 and fault breaker CB12 for proper wiring |
| No AC output voltage at rated engine RPM | Load circuit breakers open or bad | Close circuit breakers, or replace if bad |
| Output voltage too high, too low, or unstable | Engine not running stable and at correct r/min | Set r/min per instructions in appropriate engine manual |
| Unbalanced generator output voltage | Output still unbalanced with load removed at generator terminals | Check for correct grounding of generator and load |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.