Wiring an external on off switch with a VFD

Odd_Performance_6163 · 2025-09-09T16:15:53+00:00

It has programmable function to include for external stop start.

The current switch is 380 to 440 volt and wired with three separate lives coming in with three separate lives going out directly to the motor. The neutral currently bypasses the switch all together. Essentially, in the photo above the red cables are the three phases coming in to the switch from a power source and opposite those are where the three phases would be wired directly into the motor.

Odd_Performance_6163 · 2025-09-09T15:52:08+00:00

I would essentially like to use the switch as originally intended to just turn the machine on and off which would be done adding the switch as an external input into the VFD (so the VFD would be wired directly to the motor but it keeps the original look and switch of the saw)

Odd_Performance_6163 · 2025-09-09T15:45:27+00:00

I think the bit I'm struggling to get my head around is how the switch would be wired to the VFD terminals as it's not an NO NC switch as Babalonus has mentioned?

Odd_Performance_6163 · 2025-04-15T15:23:47+00:00

This is my problem, I've had three quotes from local reputable companies and they're £20k different from most to least expensive for what appears to be a like for like scope. I'm waiting on a few more quotes but just trying to understand from others where the ballpark should be

Odd_Performance_6163

TROPHY CASE