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.

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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.