New motor blowing fuses 2

[Brycol]

I recently bought a 2hp. 110/220 V. motor made by Kohlbach in Brasil. The motor has 7 wires. the wire up info plate states the following. Wires 1&5. go together and are hooked to one side of 220V. Wire 4 goes to the other side of 220V. wich leaves wires 3,6 and 2 which are tied together, lastly wire 7 is left. I WAS TOLD, wire 7 goes to ground and 3,6&2 are just bound together with a Marrett insulator. I have followed all instructions to the letter, However when I turn the motor on it always blows a fuse on one side of the 220.V. line I have 20Amp. time delay fuses and still it blows. The strange thing is the motor runs after it has blown the fuse so therefore must only be running on 110 V. I am baffled and would appreciate any help. Thanks.

 

[Marke]

Hello Brycol

I would check to see if wire 7 is internally connected to the windings. If this is the case, then I would definietly not connect it to ground!
It is possible that this wire is internally connected to the windings and you are creating another circuit path via earth. This would not be a problem if the motor was the only appliance connected to a floating system, but if there is an earth elsewhere on the system, you could have a return path.

Best regards,

Mark Empson

http://www.lmphotonics.com

 

[mc5w]

I too have encounterd situations where the directions are somehow wrong. Take the motor apart and trace out how all of the wires are connected.