I am installing a VFD on a calendar Mill. Osha requires braking during a power failure. I was going to use a dynamic brake with a capacitor bank. The vendor I am dealing with insists that I have to install a mechanical brake. Does anyone know which standard states you need a mechanical brake ...
We need to perform a ground study for a Hexane process. Does anyone know what standard address how process pipes and tanks are suppose to be grounded ?
I have an application where we need to upgrade a drive on a two speed 5ooHP Synchronous motor. Can anyone tell me can I put an ac vectrol drive on this motor and if so what are the advntages and disadvantages ?
I have been told that if a have a Silcon carbide arrestor on the primary of a transformer and a MOV lightening arrestor on the secondary of the transformer. The Silicon carbide arrestors will cause the MOV arrestors to fail. Can someone confirm this?
Can anyone direct me to resources on Arc-Flash for DC. We have someone who uses 250VDC for overhead cranes. They would like some more infomation on how to comply with OSHA. They believe that NFPA-70E is gear towards AC and batteries. They are generating their own DC.
We need to use a vfd and pump to control flow for a pump down application, where the pump is at the bottom of the tank. The problem we are having is that when the static head in the tank changes the pump charcteristics change. This causes the PID to oscillate. Can anyone give us some pointers or...
we are using a Powerex CS241250 diode as a half-wave rectifier to energize a DC Brake. The brake pulls about 9 amps. The diode is rated for 50 amps. The cicuit consists of the diode feed by 120VAC. The DC side has several contacts to control the 53VDC. When the contacts are open we read 53VDC...
