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  1. PLCs, VFDs, Motors and Controls
    I am dealing with a piece of equipment that is using SSRs to pulse the output to a standard 120VAC motor to achieve speed control. The motors are currently tripping out on thermal overload. I cannot find anybody using SSRs this way, and I have a feeling that pulsing the motors like this is...
  2. Commercial Electrical Forum
    We installed some fans for a customer with a speed control for them, all worked fine. The customer then asked for them to be put on a timer so they could be set to run for a few hours and then shut off. We installed a 30A clapper relay before the speed controllers that was controlled by a...
  3. General Electrical Discussion
    I am looking for information for the connection of a four speed motor. If someone can point me in the right direction that will be great. The motor is a Crompton Parkinson 3 phase 415 volts and 25 bhp. The motor is on a lathe to give different speeds thats the eazy part. The motor has two...
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