# VFD Question regarding fault signal

**URL:** <https://forum.avidcnc.com/t/vfd-question-regarding-fault-signal/4957>\
**Category:** General Chat\
**Created:** [July 5, 2025, 1:21pm UTC](https://forum.avidcnc.com/t/vfd-question-regarding-fault-signal/4957 "2025-07-05T13:21:33Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Rab3rd](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/rab3rd/32/5271_2.png) [@Rab3rd](https://forum.avidcnc.com/u/Rab3rd)\
**Post date:** [July 5, 2025, 1:21pm UTC](https://forum.avidcnc.com/t/vfd-question-regarding-fault-signal/4957/1 "2025-07-05T13:21:33Z")

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Here is my senerio. I dont have 230vac in my garage, I built a heavy duty (more than large enough cable) extension chord that I plug into a 230 vac plug that I added to by my breaker box. When I want to run just the laser, which only requires 110vac, I have to drag my extension cord out just to power the VFD so I can overcome the fault signal and get the EX controller running. Which pins do I need to jumper on the interface cable to “trick” the Controller into thinking the VFD is not faulted.

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**Author:** ![Rab3rd](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/rab3rd/32/5271_2.png) [@Rab3rd](https://forum.avidcnc.com/u/Rab3rd)\
**Post date:** [July 5, 2025, 1:34pm UTC](https://forum.avidcnc.com/t/vfd-question-regarding-fault-signal/4957/2 "2025-07-05T13:34:21Z")

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It appears that the warning can be disabled in the Acorn Wizard, maybe thats my eaisest route.

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**Author:** ![grossmsj](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/grossmsj/32/4903_2.png) [@grossmsj](https://forum.avidcnc.com/u/grossmsj)\
**Post date:** [July 5, 2025, 1:34pm UTC](https://forum.avidcnc.com/t/vfd-question-regarding-fault-signal/4957/3 "2025-07-05T13:34:46Z")

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If my air pressure runs low on the ATC setup, the VFD will send a fault signal. When I don’t need to use the ATC or spindle, I just turn off the power to the VFD box. The fault signal isn’t sent.  
I have stock CNC12 and the CNCDepot VFD box designed for Avid (pre-dating EX controller). That box has its own power and power switch.

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**Author:** ![Rab3rd](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/rab3rd/32/5271_2.png) [@Rab3rd](https://forum.avidcnc.com/u/Rab3rd)\
**Post date:** [July 5, 2025, 1:44pm UTC](https://forum.avidcnc.com/t/vfd-question-regarding-fault-signal/4957/4 "2025-07-05T13:44:05Z")

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Thanks, I just turned of the warning in the Acorn wizard for VFD fault and it lets me run. Easy solution. Thanks for your reply.

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**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\
**Post date:** [July 5, 2025, 6:40pm UTC](https://forum.avidcnc.com/t/vfd-question-regarding-fault-signal/4957/5 "2025-07-05T18:40:19Z")

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That solution only works on stepper systems. On servo systems you need to flip a dip switch in the control box.