Originally Posted by msteph
The equipment is a 90 ln ft combination of grinders, separators, glue spraying and pressing machines with mostly 480 v 3 phase motors. However there are several 480 v electric heating elements in a oven unit controlled by thermal couples. All the control voltage is 120v 60 hz in the control panel now. I would say the equipment is 10-12 years old. There are a few timing devices/counters on the over all set-up. The new owners (from India) ask if we could change the voltage and hz before the control panels so they would only have to make a single point connection once the equipment is reassembled. The transformer is no problem, and I have got that taken care of. It is the hz difference that I am not sure how to address.
Yes, you can do as they ask. They are going to spend a mighty dollar for a rotary converter to run all this equipment. But, if they want it, start getting quotes for the complete system.
No issue with the heating elements or control. Make sure all control devices can work with 50/60 Hz. I am fairly sure they are listed for both but not absolutely sure. Just check nameplates on everything. And make a list.
You can buy motors that are listed 230/460 @ 60 HZ and 380/415 @ 50 Hz. Check the motors you have.
As said above a VFD for each motor will solve all the motor issues.
You also can run the 460 volt motors on 412 volts until they crap out, then let them get replacements in India. I did this 10 years ago for Caterpiller and the motors are still running. If this is your company in India, this may be a good choice. Just run them. Size would be the determining factor.
I wish you good luck. You have to make some decisions. If I were in your position I would make the machines work. Not buy a very expensive rotary converter.