3 phase change over box

[fizzy]

I wish to run my 3 phase drill and small mill off a single vfd. Does anyone do a box with a 2 position change over switch and 2 sockets or do I need to make something up?

 

[daleyd]

Just 1 socket is all you need? Then swap the plugs to whatever you want to power - I don't see a need for any switch?

 

[armalites]

I'm just going through the same process, I think you'll need to make something up.

You can buy a 4 pole changeover in a box but it does seem a bit wasteful on space. I've ordered a 32a 4 pole switch 1-OFF-2 switch and I'm going to mount it and the invertor in an enclosure. As the motor is only using 3 of the poles I should be able to use the 4th to switch the control feed so the one switch will switch fully between the machines. In my case a 4 post and a 2 post lift.

 

[fizzy]

Just 1 socket is all you need? Then swap the plugs to whatever you want to power - I don't see a need for any switch?

I always find 3 phase plugs and sockets a bit stiff and fiddly. Be easier to have both machines connected and use a 3 position change over switch. L OFF R for example.

 

[armalites]

Just 1 socket is all you need? Then swap the plugs to whatever you want to power - I don't see a need for any switch?

That's what I was going to do but it's not a huge amount of money for changeover switch and unless you have a plug and play inverter then you need to switch the control circuit too

 

[Matrixx]

There is, but they would be very expensive.

 

[daleyd]

That's what I was going to do but it's not a huge amount of money for changeover switch and unless you have a plug and play inverter then you need to switch the control circuit too

I'm sorry I don't follow - the control circuit will be more than 1 wire (Start, stop, common feed, pot...) assuming this is what you mean, so 3 phases + 1 spare doesn't make sense? Or do you mean 1 pole as an input to the drive to swap parameter sets?

 

[armalites]

I'm sorry I don't follow - the control circuit will be more than 1 wire (Start, stop, common feed, pot...) assuming this is what you mean, so 3 phases + 1 spare doesn't make sense? Or do you mean 1 pole as an input to the drive to swap parameter sets?

In my case I'm switching between two ramps, all that happens is the motor runs when asked. The control is done via linking two terminals on the VFD. On my 4 post there is a microswitch on the hydraulic valve which I used to trigger the VFD. On the 2 post I'm using the contactor that origianally controlled the motor as the switch so I can use the all the original buttons on the ramp. I can run the 3 poles for the motor, link the two commons and use the 4th pole to switch between controls. That way I'm fully switchable between the two with no risk of one ramps controls operating the motor on the other ramp

 

[daleyd]

In my case I'm switching between two ramps, all that happens is the motor runs when asked. The control is done via linking two terminals on the VFD. On my 4 post there is a microswitch on the hydraulic valve which I used to trigger the VFD. On the 2 post I'm using the contactor that origianally controlled the motor as the switch so I can use the all the original buttons on the ramp. I can run the 3 poles for the motor, link the two commons and use the 4th pole to switch between controls. That way I'm fully switchable between the two with no risk of one ramps controls operating the motor on the other ramp

Something like this would do if you wanted to switch 3 phase + 1

Rs part no 624-9223

 

[armalites]

Something like this would do if you wanted to switch 3 phase + 1

Rs part no 624-9223

I did mention in my orginal post that I ordered a 1-OFF-2 32A 4 pole changover switch. Cost £19 delivered

 

[daleyd]

I did mention in my orginal post that I ordered a 1-OFF-2 32A 4 pole changover switch. Cost £19 delivered

Yes, that wasn't aimed at you, but fizzy to give him some idea of what to look for...I din't mean to quote your original post....

 

[frank horton]

u can of course have them both wired into the same circuit but u don't use em at the same time....

all my machines are on 3phase plugs and socket...easy to isolate and move machines around....
spring is here and I can feel a workshop clean is in the offing...hahaha...
the same thing will be done in my new workshop but there will be a fused master switch by the door....
the only supply in the shop at night will be a separate supply for the camera's / burger alarm....

 

[eLuSiVeMiTe]

I wish to run my 3 phase drill and small mill off a single vfd. Does anyone do a box with a 2 position change over switch and 2 sockets or do I need to make something up?

Wait one. Asked the Sam question previously and found my own solution.

 

[eLuSiVeMiTe]

https://www.mig-welding.co.uk/forum/threads/switchgear.82568/

https://www.motorstarters.co.uk/en/25a-4-pole-change-over-switch-box-size-3

 

[eLuSiVeMiTe]

Dead link but here's another https://www.cef.co.uk/catalogue/categories/industrial-control-automation-changeover-switches

 

[armalites]

u can of course have them both wired into the same circuit but u don't use em at the same time....

You can't do this if you are running a VFD unless it's a plug and play one. If you running wired directly to the motor which most are then as soon as you operate the VFD it will operate both motors so you have to be able to isolate them by either unplugging or switching and you need to isolate the control circuits too or the controls from one machine could operate the motor on a different machine.

 

[eLuSiVeMiTe]

You can't do this if you are running a VFD unless it's a plug and play one. If you running wired directly to the motor which most are then as soon as you operate the VFD it will operate both motors so you have to be able to isolate them by either unplugging or switching and you need to isolate the control circuits too or the controls from one machine could operate the motor on a different machine.

But if you put the changeover switch between the vfd and motor then split to to the second motor only one at a time will run.
Use a magnetic pendant for controls and move to each machine.

Obviously need to shut off the vfd between switching but no need for interlocks in a home shop.

 

[armalites]

@fizzy I ordered one of these and it turned up today.

https://www.ebay.co.uk/itm/32-AMP-R...var=552838076024&_trksid=p2057872.m2749.l2649

I've just done a temporary lash up and it works a treat. I used used it to switch my trigger circuit using the 4th pole as well.

For you I think your best option would be to have the controls on a pendant and use with both machines and switch the motor feeds

 

[armalites]

But if you put the changeover switch between the vfd and motor then split to to the second motor only one at a time will run.
Use a magnetic pendant for controls and move to each machine.

Obviously need to shut off the vfd between switching but no need for interlocks in a home shop.

Absolutely, that's how I've done mine except I'm using the 4th pole to switch my trigger circuit.

My point was that Frank said you could have them both wired into the same circuit, you can't unless it's switched or the VFD will drive both motors unless that's what Frank meant IE leave one running with no load

You don't need to shut off the VFD, just need to make sure it's not running when you switch

 

[eLuSiVeMiTe]

Absolutely, that's how I've done mine except I'm using the 4th pole to switch my trigger circuit.

My point was that Frank said you could have them both wired into the same circuit, you can't unless it's switched or the VFD will drive both motors unless that's what Frank meant IE leave one running with no load

You don't need to shut off the VFD, just need to make sure it's not running when you switch

Ah. Crossed wires. Be running 3 identical motors to my machines to simplify things further here.