Fanuc DC Axis Alarms
Fanuc DC Axis Alarm and velocity control unit error codes listed on this page. Only covering the M Series DC Axis units series 6047 (Yellow cap motors). No alarm info for older N thyrister based drives.
If your interested in finding stock of Fanuc DC Axis drive units (Velocity Control Unit).
| Indication | Type | Description of Alarms |
| NC | Overload | Overload alarm occurs if the motor current exceeds the current required to actuate the thermal relay. Or if the power transformer thermostat or the regenerative discharge unit thermostat operates |
| TGLS | Tacho Generator | Motor speed exceeds the specified upper limit due to a break in in the velocity feedback wire, the TGLS indicator goes on. The motor is stopped by the dymanic brake. |
| OVC | Over Current | Motor current exceeds the specified upper limit for more than the fixed period ( about 600 msec), the OVC indicator goes on. The motor is stopped by the dynamic brake. |
| BRK | Circuit Breaker | Abnormal current exceeding the rating limit of the breaker is applied to the motor, the circuit breaker operates. The motor is stopped by the dynamic brake. |
| HVAL | Over Voltage | AC input voltage applied to the servo transformer exceeds the allowable value, the HVAL indictator goes on. The motor is stopped by the dynamic brake. |
| HCAL | Low Voltage | AC power source voltage drops abnormally, the LVAL indicator goes on. The motor is stopped by the dynamic brake. |
| DCAL | DC Issue | Abnormal current is applied to the transistor bridge circuit, the HCAL indicator goes on. The motor is stopped by the dynamic brake. |
CNC are Fanuc specialists: Parts – Exchange – Repair – Test – Surplus
- Exchange -> Emergency breakdowns; swap the bad for the good immediately. Order Monday to Friday 9am to 4.30PM to ship same day!
- Repair -> Save money avoid paying deposit, keeping your own unit with known history. Current clean, inspect, repair and test turnaround 24-48 hours (normal).
- Surplus -> Either for stock critical parts or for drives that are not repairable or exchangeable due to burn outs, corrosion, etc.
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