When your CNC machine suddenly stops working what is the first thing that you do? Probably open the cabinet and check the controller or amplifier? If your machine is equipped with Fanuc Automation components, you probably check the status display on your Fanuc servo amplifier and see a number displayed?
These numbers are called alarm codes, or error codes. There could be 9 possibilities. The drive and amplifier technicians at Repair Zone use these alarm codes, also called fault codes, to help them troubleshoot during a repair. When repairing Fanuc amplifiers, many times our technicians see the same fault codes come up. Here is a list of the most common Alarm codes found on the status display on C-Series, Fanuc servo amplifiers:
Alarm Code #1
Overvoltage alarm (HV). If DC voltage of main power supply is abnormally high, overvoltage alarms occurs (HV level: 430V DC). Alarm occurs when regenerative discharge resistor is disconnected. For 200V AC input, main circuit voltage is 283V DC (200 x 1.414). Discharge operation is started at voltage of main circuit voltage plus 60V.
Alarm Code #3
DC link undervoltage alarm (LVDC). Alarm occurs if DC voltage of main circuit power supply is abnormally low (LVDV level: 120V). *Causes may include power supply voltage (+15V) being 10Vor lower and driver module PCB not inserted normally.
Alarm Code #8
Overcurrent alarm (HCL). 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, abnormal PWM signal, faulty motor, and grounded wiring.
Alarm Code #2
Control power supply undervoltage alarm (LV5V). Alarm occurs if control circuit power supply voltage (+5V) is abnormally low (LV5V level: 4.6VDC).
Alarm Code #5
Excessive regenerative discharge alarm (DCOH). Alarm occurs when average regenerative discharge energy is too high. *Causes may include operation of thermostat for regenerative discharge resistor or thermostat between (15) and (16) on terminal block T1; this operation results from too frequent acceleration/deceleration operations.
If you have any questions or need assistance, please call 989-922-0043. To view our Fanuc Amplifiers in stock and repair capabilities at RepairZone, click here:Fanuc Servo Amplifiers
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