What is Fanuc AC Serial Spindle Drive Alarm 33?
A Fanuc Drive Alarm 33 is generated by the CNC when it detects that the top board is receiving insufficient DC voltage. Here is the Fanuc Spindle Drive Alarm 33 message:
| Alarm Code | Message | Description |
|---|---|---|
| 33 | Insufficient DC link section charging | Detects insufficient charging of direct current power supply voltage in the power circuit section when the magnetic contactor in the amplifier is turned on. |
Fanuc Alarm 33 covers the following Spindle Drive product series:
| Product Series | Popular Parts |
|---|---|
| A06B-6062 | A06B-6062-H208, A06B-6062-H212, A06B-6062-H206, A06B-6062-H222, and A06B-6062-H215. Browse our selection of new and refurbished A06B-6062 Spindle Drives. |
| A06B-6063 | A06B-6063-H212#H510, A06B-6063-H226#H510, A06B-6063-H222#H510, and A06B-6063-H218#H510. Explore our inventory of Fanuc A06B-6063. |
| A06B-6064 | A06B-6064-H302, A06B-6064-H303, A06B-6064-H326, A06B-6064-H322, and A06B-6064-H312. See more Fanuc A06B-6064 Drives. |
If your unit falls under the A06B-6062, A06B-6063, or A06B-6064 product series and has generated a Fanuc Alarm 33, you will need to check and test the PCBs to properly troubleshoot the issue.
How to Troubleshoot a Fanuc Spindle Drive Alarm 33:
Step 1
Check all the jumpers, especially the S5 jumper.
Step 2
Apply three-phase power to the drive and turn on the control.
Step 3
If the drive comes up with a display, then check test pins VDC and SDC to the ZERO volt test pin. All three pins are located on the A16B-2201-0440 PCB with the LED display. The VDC and SDC to the ZERO volt test pin reading should both measure close to 3 volts DC.
Step 4
If the VDC and SDC to the ZERO volt test pin reading doesn’t measure close to 3 volts DC, then measure the DC voltage between the B+ and B- test pins. The B+ and B- test pins are located on the A20B-2000-0220 PCB. There should be 300 volts DC across the B+ and B- test pins. Make sure you can hear the contactor in the drive engage.
Fanuc Spindle Drive Alarm 33 Diagnosis:
Diagnosis A
If the B+ and B- test pins DO measure 300 volts DC, then there is probably a problem with the alarm circuitry on the drive, i.e. the Fanuc Spindle Drive Alarm 33 was inaccurately detected and generated. Verify that the LEG-TO- LEG and LEG-TO-GROUND AC voltage into the drive is correct.
Diagnosis B
If the B+ and B- test pins DO measure 300 volts DC, then there is probably a problem with the alarm circuitry on the drive, i.e. the Fanuc Spindle Drive Alarm 33 was inaccurately detected and generated. Verify that the LEG-TO- LEG and LEG-TO-GROUND AC voltage into the drive is correct.
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