The Qc1002 is a generator-set controller. It is used on generator sets from Atlas Copco, John Deere and Volvo Penta, including the QAS 100 Pd, QAS 14, QAS 150 John Deere and QAS 20.
Used across brands: Atlas Copco, John Deere, Volvo Penta
Also fitted to: Atlas Copco QAX 20/24, Atlas Copco QAX 30/35.
| Symptom | Cause | Remedy |
|---|---|---|
| After being excited alternator does not excite | Connections are interrupted | Check connection cables as per attached drawings |
| After being excited the alternator still gives 0 Volt | Connections are interrupted | Check connection cables, measure winding resistances and compare with values mentioned in the alternator manual |
| After being excited the alternator still gives 0 Volt. | Connections are interrupted. | Check connection cables, measure winding resistances and compare with values mentioned in the alternator manual. |
| Alternator does not excite | Blown fuse | Replace fuse |
| Alternator gives 0 Volt | Blown fuse. | Replace fuse. |
| Bad compression | Restriction in air filter/cleaner or induction system | |
| Black exhaust smoke | Restriction in air filter/cleaner or induction system; Fault in atomisers or atomisers of an incorrect type; Fault in cold start system; Wrong type or grade of fuel used; Restriction in exhaust pipe; Engine temperature is too low; Incorrect valve tip clearances; Engine overload | |
| Blue or white exhaust smoke | Wrong grade of lubricating oil; Fault in cold start system; Engine temperature is too low | |
| Crankcase pressure | Restriction in breather pipe | |
| Failed regulator. | Substitute regulator. | |
| High fuel consumption | Restriction in air filter/cleaner or induction system; Fault in atomisers or atomisers of an incorrect type; Fault in cold start system; Wrong type or grade of fuel used; Restricted movement of engine speed control; Restriction in exhaust pipe; Engine temperature is too low; Incorrect valve tip clearances | |
| High voltage at no load | Voltage potentiometer out of setting | Reset voltage potentiometer |
| Higher than rated voltage at load | Voltage potentiometer out of setting | Reset voltage potentiometer |
| Intervention by protection. | Current too high, power factor lower than 0.8; speed lower than 10% of rated speed. Failed regulator. Substitute regulator. | |
| Intervention of protection. | Check frequency/voltage regulator. | |
| Low voltage at no load | Voltage potentiometer out of setting | Reset voltage potentiometer |
| Lower than rated voltage at load | Voltage potentiometer out of setting | Reset voltage potentiometer |
| Misfire | Restriction in a fuel pipe; Fault in fuel lift pump; Dirty fuel filter element; Air in fuel system; Fault in atomisers or atomisers of an incorrect type; Fault in cold start system; Engine temperature is too high; Incorrect valve tip clearances | |
| No residual voltage. | Excite the alternator by applying a 12V battery voltage with a 30 W resistor in series on the + and - terminals of the electronic regulator, respecting the polarities. | |
| Not enough power | Restriction in a fuel pipe; Fault in fuel lift pump; Dirty fuel filter element; Restriction in air filter/cleaner or induction system; Air in fuel system; Fault in atomisers or atomisers of an incorrect type; Restriction in fuel tank vent; Wrong type or grade of fuel used; Restricted movement of engine speed control; Restriction in exhaust pipe; Engine temperature is too high; Engine temperature is too low | |
| Regulator out of setting. | Regulate stability of regulator by acting on STABILITY potentiometer. | |
| Rotating bridge failure. | Check diodes, disconnect cables. | |
| The engine does not start or is difficult to start | Starter motor turns engine too slowly; Fuel tank empty; Fault in fuel control solenoid; Restriction in a fuel pipe; Fault in fuel lift pump; Dirty fuel filter element; Air in fuel system; Fault in atomisers; Cold start system used incorrectly; Fault in cold start system; Restriction in fuel tank vent; Wrong type or grade of fuel used; Restriction in exhaust pipe | |
| The engine knocks | Fault in fuel lift pump; Fault in atomisers or atomisers of an incorrect type | |
| The engine runs erratically | Fault in fuel control | |
| The engine shuts down after approx. 15 sec. | Bad connection towards oil pressure | |
| The engine starts and stops | Dirty fuel filter element | |
| The engine temperature is too high | Restriction in air filter/cleaner or induction system | |
| The pressure of the lubricating oil is too high | Wrong grade of lubricating oil | |
| The pressure of the lubricating oil is too low | Wrong grade of lubricating oil; Not enough lubricating oil in sump; Defective gauge; Dirty lubricating oil filter element | |
| The starter motor turns the engine too slowly | Battery capacity too low; Bad electrical connection; Fault in starter motor; Wrong grade of lubricating oil | |
| Unstable voltage | Speed variation in engine | Check regularity of rotation |
| Vibration | Fault in atomisers or atomisers of an incorrect type | |
| Winding failure. | Check windings. |
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.