Applicable Systems
Series 0i
Series 16/18/21
Alpha
Beta
Symptoms
The servo control unit reports alarm SV 458 (CURRENT LOOP ERROR) on the Z. The servo amplifier for the Z may display an error state on its status LEDs. The axis may stop or fail to move until the condition is corrected.
Possible Causes
- Z servo amplifier fault: CURRENT LOOP ERROR
- Z servo amplifier wiring or connector issue
- Z servo amplifier power supply problem
Troubleshooting Steps
- Step 1: Check the Z servo amplifier status LEDs and record the displayed state.
- Step 2: Verify all power and signal cables to the Z servo amplifier are securely connected.
- Step 3: Measure the Z amplifier DC link and control voltages per the maintenance manual.
- Step 4: If the Z amplifier is faulty, replace it with a matching FANUC unit.
How to Reset
Power off the machine, correct the fault condition, power on, and press RESET. If the alarm reappears, service the servo amplifier.
Common Replacement Parts
- varies: Z servo amplifier (if confirmed faulty)
Frequently Asked Questions
- Q: What does Fanuc SV 458 Z alarm mean?
Fanuc SV 458 Z indicates a servo alarm (CURRENT LOOP ERROR) on the Z. Check the servo amplifier and its connections.
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Source: HelmanCNC.com - https://www.helmancnc.com/fanuc-alarm-codes-list/ (servo alarm with n-th axis)
Category: CNC
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