Centroid Community CNC Support Forum

Raceman17 wrote: ↑Mon Apr 06, 2020 5:08 pm Can someone tell me if these dyn4 drives can be wired up to 240 volt single phase power. I have regular US house power where each hot leg it 120volts and they share the ground. All my problems seemed to go away when the drive was hooked up to a single 120volt wall outlet. I was under the impression that these could be wired 240v single phase. If they can be wired to 240 volt what is the placement of the wires for R T L1 and L2?

I noted quadrature errors when running on 240 way back during early testing. The problem seemed to go away when logic power was 120V.
The issue was that the DB connectors on the drive were floating. As soon as I took the DB shield and grounded it, the fault went a way. THIS IS WITH AN OAK system NOT ACORN.

Did you order the drives for 120 or 240? Best to double check with DMM.
US Household single phase 3 wire power is 240VAC Phase to Phase, and 120V phase to ground.
And no, you can not use the chassis ground as a neutral. You would have to bring IN a neutral to the control cabinet. That is you would have 4 wires. 2 hots, a neutral and a ground.

Marty

I think the drives they sell right now you can use both 120 or 240 volt input. The drives say they're rated from 100 to 230vac input. I was/am using a 3 wire 240 plug. 2 hots and a ground. I just bought everything to change the wiring over to 2 hots a ground and a neutral. With it being said how would you wire the 240 volt with two hots a ground and a neutral. Could my problem be I am sharing a ground and neutral?

Define sharing a ground and a Neutral

You are using the ground FOR a neutral?

Neutral and ground should only EVER be connected at the entrance panel of the building. Ground is a safety feature and not a current carrying conductor.

tblough wrote: ↑Mon Apr 06, 2020 7:04 pm Neutral and ground should only EVER be connected at the entrance panel of the building. Ground is a safety feature and not a current carrying conductor.

Tom is absolutely correct.

My ground and neutral are separated in the panel box in my shop. They are not shared. I guess I'm really not sharing a ground since they are separated in the panel. Like I said my setup has two hots and a ground. So if something called for a ground I connected it to the ground wire.

So for all intents and purposes of this conversation I do not have a neutral wire connected to the system.

Raceman17 wrote: ↑Mon Apr 06, 2020 7:10 pm So for all intents and purposes of this conversation I do not have a neutral wire connected to the system.

And you are NOT using the ground as a neutral. That is, you have NOTHING requiring 120vac in your cabinet and everything is wire 240vac correct?

I originally had the acorn powered with 120vac with the power supply provided. I had to add a second dedicated 24v power supply to power the brake release coil in the z axis servo. I also have a 120vac transformer to get 24vac for a contactor.

Using a 240 to 120vac step down transformer is acceptable for 120vac devices