C Series Servo Amplifier Alarms
Fanuc Servo Amplifier C Series Alarm and Error Codes.
These FANUC C Series servo amplifier alarms and error codes cover the A06B-6066 series.
Please contact us if you need testing, a repair or an exchange part. For further information please visit our dedicated Fanuc Servo Drive C Series Page.
| Alarm Code | Type | Description of Alarm/Error |
| 1 | HV
(Overvoltage Alarm) |
If DC voltage of main circuit power supply is abnormally high, over voltage alarm occurs ( HV level: 430V DC). Alarm occurs when regenerative discharge resistor is disconnected. For 200V Ac input, main circuit voltage is 283V DC (200×1.414). Discharge operation is started at voltage of main circuit voltage plus 60V. |
| 2 | LV5V
(Control power supply undervoltage) |
Alarm occurs if control circuit power supply voltage (+5V) is abnormally low (LV5V Level: 4.6 VDC) |
| 3 | LVDC
(DC Link undervoltage alarm)
|
Alarm occurs if DC voltage of main circuit power supply is abnormally low. (LVDV level: 120V). Causes may include power supply voltage (+15V) being 10V or lower and driver module PCB not inserted normally. |
| 4 | DCSW
(Regenerative control circuit abnormality) |
Alarm occurs when short time regeneration discharge energy is too high. Cause can be disconnection of regenration discharge resistor. If IGBT for discharge is continuously on for 1 second or longer, cause may be short circuit between C and E for IGBT for discharge. |
| 5 | DCOH (Excessive regenerative discharge alarm) |
Alarm occurs when average regenerative discharge energy is too high. Causes may include operation of thermostat for regenrationdischarge resistor or thermostat between (15) and (16) on terminal block T1: this operation results from too frequent acceleration/deceleration operations. |
| 6 | OH (Servo amplifier overheat) |
Alarm occurs when thermostat in amplifier operates ( when thermostat contact on PCB opens). Check if motor load exceeds rated current. |
| 7 | MCC (Magnetic contractor welding alarm) |
Alarm occurs when magnetic contactor contact welds. Check for contact welding immediately after use of magnetic contactor is specified. Causes may include short circuit of 3 phase diode bridge. |
| 8 | HCL (Overcurrent alarm) |
Alarm occurs when abnormally high current flows in main circuit of 1-axis amplifier or in main circuit of L axis of 2-axis amplifier. Causes may include faulty IC, abnomral PWM signal, faulty motor, and grounded wiring. |
| 9 | HCM (Overcurrent alarm) |
Alarm occurs when abnormally high current flows in main circuity of M axis of 2-axis amplifier. Causes may include faulty IC, abnormal PWM signal, faulty motor, and grounded wiring. |
| b | HCLM (Overcurrent alarm) |
Alarm occurs when abnormally high current flows in main cirucits of L and M axes of 2 axis amplifier. Causes may include faulty IC, abnormal PWM signal, faulty motor, and grounded wiring. |