Gary Gagnon
Member
- Location
- 49461
- Occupation
- Electrical tech
Hey guys. I have a need to isolate a production cell from the rest of the plant. Its fed from a standard 60 amp buss switch down through a 60 amp disconnect, with 40 amp fuses directly to servos, then a single phase 5kva transformer for 120 volts that runs all the PLC, pneumatics, conveyor motors, ect... We have experienced a few isolated issues where the servos (AB Kinetix) have picked up stray high voltage (brownouts/spikes?) from the plant and I'm wanting to put this machine on its own transformer, or figure out some protection.
I know the machine draws around 12'ish amps while running. I have 3 questions:
1.) should I reduce the disconnect fuse size and run a smaller ISO transformer (9 & 10 KVA seem to be common sizes)
2.) what type of isolation transformer should I purchase? I've never spec'd one before. They seem to be mostly delta/wye, but I'm not sure if I want or need 3ph neutral. Delta/Delta xfomers seem kind of rare in smaller applications like mine.
3.) is there a better way to protect our expensive servo machines, other than an isolating xformer on the 480, for reasonable money?
I know the machine draws around 12'ish amps while running. I have 3 questions:
1.) should I reduce the disconnect fuse size and run a smaller ISO transformer (9 & 10 KVA seem to be common sizes)
2.) what type of isolation transformer should I purchase? I've never spec'd one before. They seem to be mostly delta/wye, but I'm not sure if I want or need 3ph neutral. Delta/Delta xfomers seem kind of rare in smaller applications like mine.
3.) is there a better way to protect our expensive servo machines, other than an isolating xformer on the 480, for reasonable money?