3 phase motor connection plate

3 phase motor connection plate

This topic has 29 replies, 13 voices, and was last updated 31 October 2022 at 17:12 by John Templeman.

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30 October 2022 at 20:17 #619189
John Templeman
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@johntempleman87735
Good point, I had not actually thought of that, however I did use the original switch connected to the control inputs of the VFD but to be honest that was so I could keep the original switch gear on the machine. My next challenge is to work out how to incorporate the existing limit switches on the table into the electrical system.
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31 October 2022 at 09:32 #619239
Les Riley
Participant
@lesriley75593
There is always the other option of having 3 phase connected to your house.

That is the route I took.

I still use variable drives on some of my machines but only for speed control.

Les
31 October 2022 at 14:00 #619261
Clive Foster
Participant
@clivefoster55965
An effective way to avoid inadvertent speed switching whilst the VFD is running would be to use one of the mechanically interlocked contactor units used in forward – stop- reverse systems. With these the "on" contactor moves a mechanism preventing the other contactor from turning on. Need to use the stop button first to relase the latch before the other speed can be selected.

The one I got for when I finally finish sorting my American style vertical opening bi-fojd garage door was about £40, I think.

Clive
31 October 2022 at 16:28 #619268
Gary Wooding
Participant
@garywooding25363
When I upgraded my lathe to use a VFD I opened the CTL box to figure out the way to incorporate the VFD. I was faced with the maze of wires, switches and relays shown in the photo below. After a lot of head-scratching I realized that it was really all about controlling the forward/reverse power to the motor by means of the low voltage switches. The relay KM1 provided the mains power and all the motor switching was via the other relays.

The Original Layout diagram shows the salient features of the original CTL wiring and the Modified for VFD shows the far simpler layout when the VFD handles everything. All the original external controls of the lathe work as they did before the VFD, but I added a little speed control rheostat on the lathe control panel.
31 October 2022 at 17:12 #619273
John Templeman
Participant
@johntempleman87735
That looks a little bit like the inside of my cabinet lol, I am not that confident when messing with electrics so I think I will be rewiring my machine from scratch and probably removing all the original electrical equipment and wiring apart from the switches.
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