TM1 low DC bus

[Paulynanne]

We have a TM1 installed using a single phase supply of 220vac.. machine requires 240vac input.. I noticed the Dc bus is only 293vdc, it should read 320vdc. Wil this cause any problem to the machine?

[juxtoposed]

Is there not jumpers to set, by the transformers, to adjust for input voltage on your machine? I have a TL-1, TM-1P and a TM-3P and they all do.

[Paulynanne]

Theres no transformer to adjust the input voltage on our TM1. I just want to know if the low dc buss could cause any problem..thanks

[JohnJW]

There's a section in the setup manual where you measure the input voltage and connect the wires from the breaker to the corresponding section of the terminal block base on the input voltage. I don't know if this step applies to single phase power setup as well.

[Donkey Hotey]

Yes, low voltage will cause alarms and stop your programs.

Everybody is telling you that you have transformer connections and I think they're right. It's the terminal strip on the bottom, right corner of the control cabinet and each set of terminals is marked with the corresponding input voltage. Connect the three wires to the proper terminals and your DC buss will come up to where it's supposed to be.

[Geof]

I think 'everyone' is not (are not?) right telling you to look for the transformer taps because you will not find them on a machine with the 320 volt power supply. At least that is the case with my TL2.

It is possible that you could run the machine on 220 volts, I think the maximum spindle and servo power will be reduced but not noticeably. However, it might be a better idea to get a transformer to bump the supply up to 240. You should be able to find an autotransformer to do this.

If you do decide to run on 220 I suggest you occasionally check that the power supply is not overheating but remember to turn off the main power before poking around inside the cabinet.

[NWSERVICEGUY]

293vdc is within spec. Below 290vdc some machines will error out. There is a parameter that states what the lowest voltage is. I have seen many machines running at this level without any problems.