Atlas Copco QAS246 Gd USA troubleshooting: 13 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Atlas Copco QAS246 Gd USA — full specs, parts & maintenance.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| Blown fuse | Alternator does not excite. | Replace fuse. | |
| Increase the speed by 15 % | Insufficient residual voltage. | ||
| Reset voltage | Low voltage at no load. | Voltage potentiometer out of setting. | |
| Check rpm | Intervention of protection. | Winding failure. | Check windings. |
| Substitute regulator. | High voltage at no load. | Voltage potentiometer out of setting. | |
| Reset voltage potentiometer. | Lower than rated voltage at load. | ||
| Substitute regulator. | Current too high, power factor lower than 0.8; speed lower than 10 % of rated speed. |
| Symptom | Cause |
|---|---|
| No residual voltage. | |
| After being excited alternator does not excite. | Connections are interrupted. |
| Failed regulator. | Rotating bridge failure. |
| Higher than rated voltage at load. | |
| Unstable voltage. | Speed variation in engine. |
| Engine runs in idle speed. | No SAPE connected. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Connections are interrupted.. See the table for the matching fixes.
Documented causes: Voltage potentiometer out of setting.. See the table for the matching fixes.
Documented causes: Winding failure.. See the table for the matching fixes.