Spray Booth Motor Troubles

[vinnygalbo]

I recently wired 2 3-phase WEG motors of 2HP and 10HP for a spray booth in a paint shop. Page 26 of the following catalog has this motor listed.

http://www.clrwtr.com/PDF/WEG/WEG-3-Phase-General-Purpose-Motors.pdf

The 10HP motor is for the air compressor. The Compressor is wired for low voltage delta. The 3-pole 40amp breaker at the panel trips after the compressor runs for 10 seconds. I checked the rotation of the fan on the compressor and everything checks out. What else can I do to get this motor running?

Should I reconnect the motors in the Wye configuration? What's the risk?

 

[Ingenieur]

what voltage?
208 or 240?
have you measured the amp draw?
does the compressor have an unloader?

 

[kwired]

I recently wired 2 3-phase WEG motors of 2HP and 10HP for a spray booth in a paint shop. Page 26 of the following catalog has this motor listed.

http://www.clrwtr.com/PDF/WEG/WEG-3-Phase-General-Purpose-Motors.pdf

The 10HP motor is for the air compressor. The Compressor is wired for low voltage delta. The 3-pole 40amp breaker at the panel trips after the compressor runs for 10 seconds. I checked the rotation of the fan on the compressor and everything checks out. What else can I do to get this motor running?

Should I reconnect the motors in the Wye configuration? What's the risk?

Have no idea which particular motor you have or the specifics of that motor. If it is dual voltage and shows wye and delta connections - the wye connection would be for the higher rated voltage.

Otherwise assuming you have an otherwise good motor there are many possibilities of what might be happening here and the more details you can give us of the installation the more we can narrow down the problem from just guesses.

You could have too low of voltage, incorrect nominal voltage, mechanical problems, incorrectly selected motor for the application, single phasing conditions- though it probably won't turn the motor shaft at all from a dead stop condition if you completely lost a phase. Running is on 208 nominal when it is rated for 240 volts could cause some problems but that alone probably doesn't result in overcurrent tripping in just 10 seconds.