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Fanuc Servo Amplifier Alarm 456 - ILLEGAL CURRENT LOOP

FANUC Alarm Codes >> FANUC Servo Amplifier Alarms >> Servo Amplifier Alarm 456

Description: The current control cycle settings (parameter No. 2004, bit 0 of parameter No. 2003, and bit 0 of parameter No. 2013) are incorrect.

Possible problems are as follows:

  • For the two axes whose servo axis numbers (settings of parameter No. 1023) are an odd number followed by an even number (a pair of axes 1 and 2 or axes 5 and 6, for example), a different current control cycle is set for each of the axes.
  • The requirements for slaves needed for the set current control cycle, including the number, type, and connection method of them, are not satisfied.


Contact Tri Star CNC Services

Nationwide FANUC Servo Alarm 456 Troubleshooting, Repairs & Replacement Service

Give Tri Star CNC a call and we’ll help you determine the source of the FANUC Servo 456 error and find solutions ASAP. We offer FREE phone support (call 815-578-9145 now), competitive repair pricing, or quick turnaround on a replacement component from our exchange stock if necessary. If you need on-site support we can point you in the right direction through our field service network.

FANUC-GE Parts Exchange & Repair Warranty Information

Exchange FANUC parts and repaired parts include a 1-year warranty. Tri Star CNC, LLC warrants the COMPLETE ASSEMBLY REPAIR – not just the parts and labor.

Get more details on our FANUC warranty and please contact us for further CNC machine support.

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