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we have seen problems like this occasionally when a pump has a bad check valve. pump spins backwards until motor is energized and then BANG major repair bill...

Thank you!

how much difference will it make if I replace the squirrel cage in an AHU where all dimensions are identical except for the number of blades. original has 16, and my new blade will only have 10. will there be a need to speed the fan up to move the same amount of air?

maintenance guys in the plant told me nobody touches those valves, but i have no referene to where they should be set at. the "tech" manuals they have are little more than sales pamphlets. 42 amps no load is not high for this motor at all, its just a little over a third of rated amperage which...

I'm having a problem with a 75kw doubleshaft electric motor, it drives two hydraulic pumps and when these pumps reach their high pressure the motor is drawing 200+ amps (it is rated at 118A @460vac) this situation only lasts for a second or two at a time, but it happens 10-12 times a minute and...

Rewinding single phase motors are few and far between these days. When they they do come in they are special or obsolete, my question about the rewinding o them is this: WHY do the main windings seem to be installed in layers? It used to be a four pole winding with six leads would have two...

Jraef, you are absolutely right. The unit is 15 years old (outdated by most standards) the transistors and diodes both test good, it really is time to upgrade this unit (they got their moneys worth) and my question (s) have been for my own benefit. The more capable I am at troubleshooting the...

Hidden sync? Where would I look for that in a magnetek drive...

that helps, but is there a way to test the firing sequence to verify this is the problem? If so, what would cause this problem?

its an older magnetek e505 model (I think its a 505) we deal with a lot of Yaskawa now and I'm pretty sure they actually made these units under the magnetek name. I will be able to check the model tomorrow to be sure.

I have a VFD, when we hook a motor to it the shaft just rocks back and forth; when the same motor is hooked up to the drive next to it it works fine... Why are the motor shafts just rocking back and forth on this drive and not running? I have tested the the diodes and transistors as well as the...