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Member postings for John Lisle

Here is a list of all the postings John Lisle has made in our forums. Click on a thread name to jump to the thread.

Thread: AT1 inverter 3 wire control
28/02/2020 22:22:28

Hello again - OP here

Thanks everyone once again for sharing your expertise.

Stevie, not sure which manual you viewed that says "cannot be momentary pushbutton" - I can get start up and continuous run with momentary push with parameter 3 or 11. And I can get stop with momentary push on parameter 4 or 19. What I'm looking for is somethign activated when a circuit is broken momentarily, not when it is made momentarily.

Today I had a jolly time trying all the modes on flying lead-test and most again with the actual switches wired in.

The device behaves, to be honest, a bit oddly - I couldn't distinguish between some parameters, and others behaved differently to what the manual suggested, acting as change state switches (on and off) rather than one-time.

Bottom line is I didn't find an answer, so I think I need ot change my NC panic button to a NO one. That's a shame as my lathe has both in a single block )and imperial measurments), so replacing is going to be a bore.

Thanks again!

27/02/2020 19:24:14

Thanks everyone - lots to try there.

The manual linked (thank you martin) matches my machine. Alas there's no setting for 3 wire control.

I didn't explain very well - my setup was as the second picture just above - the switches in series.

It appears to me that the inverter only does "action when circuit closed" not "action when circuit broken", which seems surprising but there you are.

I can try to replace the NC stop with a NO one - I know from fly-lead testing that I can get that to work. I don't have a solution for the NC microswitches though.

I will have a go at the "keying operation" and "keying stop" tomorrow!

Thanks again - much appreciated.

27/02/2020 13:43:14

I've seen that several people on here have one of the "cheap Chinese" VFDs - in my case an AT1-2200X.

I'm trying to wire up a standard 3-wire control (run Normally open; Stop normally closed)... and it's doing my head in. Has anyone accomplished this?

I have X1 (say) set to 11 - keying forward switch. When I connect this to common across the NO button, the momentary push works perfectly - motor runs.

The problem comes with the NC stop button. I connect that across common and X5 and have tried:

X5 set to 1 - Starts normally but only get a momentary stop by pressing stop

X5 set to 2 - The motor runs immediately on turning on power at the wall. Stop works, but only on release of the button (as the circuit is re-made, not as it is broken)

X5 set to 4 - As 2 above, except the motor did not immediately run on startup. This seems to effectively make the NC button into a NO one.

X5 set to 19 (emergency stop) - Motor will not start, unless I hold in the stop button to break that circuit. Then stops when I release the button.

I'm obviously doing somethign foolish with either the wiring or the parameters, but I can't for the life of me see what.

I'd be very grateful if someone has done this and can tell me the two parameters!

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