We bought an equipment asking for 220V power supply. What we have now is 208V or 600V. The manufacturer said the machine can not run under 208V definately. Then there is a spare 600-240V transformer available and a guy in my office says it is okay for a 220V machine run under that transformer. Can anybody tell me why? for me, 240 minus 5% is 228V,still larger than 220V. thanks for any input in advance.
I have personally burned up european 220v equipment trying to run it on 208, both motors and control relays. Even flew this specialist from Germany to tell me so. (Turns very red.) I fixed it with three single phase transformers to boost the voltage. Just remember when sizing the transformers that you don't need to calculate for the entire draw when sizing, just the difference.
#72665 - 12/06/0609:02 PMRe: 220V equipment runs on 240V
Even if the equipment will operate successfully on 208V, when a manufacturer specs 220V, it's in your own best interest to give them what they ask for, if only for warranty's sake. It saves a World of negotiating when some part on their machine breaks, if only because they can't claim the old "Electrician Supplied the Wrong Voltage" line.
16/32 volt transformers can be used in a boost arrangement to get about 222 Volts. You can almost hear the manufacturer's smile when verifying with them if that's OK over the phone.
All too commonly, guys will use 12/24 volt transformers and boost the voltage up to about 239 from 208, thinking they've hit the "target". The target is 220.
Take away their excuse!
#72666 - 12/06/0610:27 PMRe: 220V equipment runs on 240V