Machine Wiring Help

[jbolt]

I am in the middle of a CNC conversion of a R45 clone mill. The mill came with power z-axis and a power table feed. I have moved the machine controls to another enclosure and have removed the motor contactors and switches for the z and table motors since I will no longer be using them. When I moved the controls and wiring I left most everything connected. Upon reconnecting the power I cannot get the motor contactor to energize. I'm pretty much out of my realm on chasing this down. I have 220vac to the contactor and transformer input. On the transformer output I get 13.9vac to terminal 31 and 6.2vac on terminal 30. If I understand the label correctly I think I should be getting 24vac at 30 & 31? Everything worked fine prior to disconnecting and reconnecting. Below are pictures of the original installation and the new enclosure installation. any help would be appreciated.

Jay

 

[rdhem2]

Before I could even start I would need an original wiring diagram. My first thought is you opened a circuit for the "Z" axis that told the other ones it was fine. You usually can not just remove wiring for one thing without affecting something else.

Good luck, this one could be fun!

 

[John Hasler]

I am in the middle of a CNC conversion of a R45 clone mill. The mill came with power z-axis and a power table feed. I have moved the machine controls to another enclosure and have removed the motor contactors and switches for the z and table motors since I will no longer be using them. When I moved the controls and wiring I left most everything connected. Upon reconnecting the power I cannot get the motor contactor to energize. I'm pretty much out of my realm on chasing this down. I have 220vac to the contactor and transformer input. On the transformer output I get 13.9vac to terminal 31 and 6.2vac on terminal 30. If I understand the label correctly I think I should be getting 24vac at 30 & 31? Everything worked fine prior to disconnecting and reconnecting. Below are pictures of the original installation and the new enclosure installation. any help would be appreciated.

You should have 24VAC between 30 & 31. Unless the winding is grounded (it probably isn't) what you read from either terminal to ground is meaningless.

I can't tell anything useful from the pictures. Sorry.

 

[jbolt]

Here is the wiring schematic from the manual.

 

[JimDawson]

Based on the voltages read from 30 and 31 is seems that you are measuring to ground. You should find 24VAC across 30 and 31 and not referenced to ground.

I'll look at the schematic and see if I can see anything.

Best of luck.

EDIT:

From the schematic that Jbolt posted, it looks like one side of the 24VAC should be grounded, this would be normal. The other side should go to wire 1, then through the breaker, and exits the breaker as wire 3. Follow the schematic through with your volt meter and see at what point you lose power.

 

[jbolt]

Based on the voltages read from 30 and 31 is seems that you are measuring to ground. You should find 24VAC across 30 and 31 and not referenced to ground.

I'll look at the schematic and see if I can see anything.

Best of luck.

Okay I get 27vac across 30 and 31.

Jay

 

[John Hasler]

Okay I get 27vac across 30 and 31.

Jay

That's close enough. Have you checked the fuse?

 

[jbolt]

That's close enough. Have you checked the fuse?

Fuse is good.

 

[chip_slinger]

Are both estops disengaged?

Fuse is good.

 

[jbolt]

Are both estops disengaged?

Both? There is only one e-stop.