Wow Really? Seems like a pile would have to be built up between the back plane and the breaker body before an arc could be created.
Thanks for you help guys!
How much debris would it take to cause that arc to occur? There seems to be quite the void to fill up before debris could cause the arc?
Picture of aftermath
Its an Allen Bradley Molded case breaker. I think its actually made by Cutler Hammer. Its mounted to a back plane inside of a VFD. Im surprised stuff could get behind it the way it is mounted to back plane.
Here are some pics of the failure. What could cause this or what are some of the modes of failure?
Some information -
Its 480V main drive unit. The failure occurred on a model 140-R6 molded case circuit breaker.
The failure occurred on the line side between L2 and L3. The back of the input...
The motor is inverter duty rated.
Im hung up on this. Since HP is calculated by (Eff X V X Amps)/746 I wouldnt be losing any HP when hooking this motor up to 50hz. I would still lose torque though because I would lose speed BUT if I make the VFD provide the motor with 60hz then I should be...
Yeah Im sure. Here's the deal. The motor is going to CHina. They are 380/50Hz std.
The issue is I already this motor in 60hz. Buying another explosion proof motor in 50hz clothes means going up a frame size and adding 2000 bucks to the cost. If I can save about $11k - I would like to.
So knowing what I know about electric motors, which is nothing, why wouldnt this work with a VFD? Can I just "turn the knob" on the VFD to give the motor the 60hz its looking for to negate the 17% loss I would normally occur without a VFD?
My bet is its not that easy since nothing is that easy.
Who do you guys use for electric clutching pulleys on a belt drive system? We have a diesel engine belt driving a vacuum pump and a wash down pump but we dont want the wash down pump running all the time. We'd like to have it swtiched on an electric clutch so the operator can turn it on and off...
Tell me about it. I went to the back to check up on some stuff and asked about the slack tube. "Oh we dropped it. We cleaned it up though."
"How?" I asked knowing that I didnt want to know.
"With a broom and a dust pan."
Actually, this motor is hooked to a variable freq drive which allows us to test the blower at various RPM. We know the RPM by the freq displayed and was varified by a Browne and Sharpe tach.
Is the display on the VFD accurate? For instance, if the display shows 24 amps current draw, can I then...
Yo compositepro. In the directions for the Slack Tube manometer it states mercury can be used and they have it available - but I inquired about it and they specified they no longer carry it.
The slack tube was dropped and the mercury ran out.
Im moving to electronic from now on.
