The VFT Data Center is a generator-set controller. It is used on generator sets from Cummins/Onan, including the P9500df.
| Symptom | Cause | Remedy |
|---|---|---|
| Engine runs erratic; does not hold a steady RPM. | 1. Dirty air filter. 2. Applied loads maybe cycling on and off. | 1. Clean the air filter. 2. As applied loads cycle, changes in engine speed may occur; this is a normal condition. |
| Engine will not start or remain running while trying to start. | 1. Fuel shutoff valve is in the OFF position. 2. Generator is out of gasoline. 3. Fuel flow is obstructed. 4. Starting battery may have insufficient charge (only for electric start models). 5. Dirty air filter. 6. Low oil level shut down switch is preventing the unit from starting. | 1. Move the fuel shutoff valve to the ON position. 2. Add gasoline to the generator. 3. Inspect and clean fuel delivery passages. 4. On electric start models only, check battery output and charge battery as necessary. 5. Check and clean the air filter. 6. Check oil level and add oil if necessary. 7. Firmly push down on the spark plug boot to ensure the boot is fully engaged 8. Remove and check the spark plug. Replace if faulty. 9. Check and clean the spark arrestor. 10. Drain fuel and replace with fresh fuel. |
| Frost on the propane tank or regulator. | 1. This can be a normal occurrence caused when liquid propane changes phase to a gas. 2. The propane tank is not equipped with an OPD (rollover protection device) and has been stored in a horizontal position allowing liquid propane to enter the downstream fuel handling equipment. | 1. As this can be normal, providing all the propane fuel handling equipment is functioning normally, no remedy is needed. 2. If you suspect your propane fuel tank is |
| Generator suddenly stops running. | 1. Generator is out of fuel. 2. The low oil shut down switch has stopped the engine. 3. Too much load. | 1. Check fuel level and add fuel if necessary. 2. Check oil level and add oil if necessary. 3. Restart the generator and reduce the load. |
| Push button start is not working and the cranking speed drops after each attempt. | 1. Battery is not adequately charged. | 1. Turn the engine switch to “STOP” and hook up the battery charger for 1 hour. 2. Try manually starting the generator to let the battery charge while it is operating. |
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.