This makes a very simple circuit with only three wires coming back from the motor and the simplest reversing circuit. Whichever winding is fed directly, becomes the run winding and the other winding, fed through the capacitor becomes the start winding. L2 goes to a common connection and L1 goes to a double throw switch with off position, or a similar relay. One variation is a small motor with two identical windings. PSCs or Permanent Split Capacitor motors are generally used in smaller sized motors. You may be able to see the centrifugal switch through the ventilation holes on the back of the motor. They may be identified by the click as they accelerate and a click followed by a slight dragging noise as they coast to a stop. Paul RE: Motor Wiring diagram confustion - P1/P2 ?Ĭapacitor start motors are very common. I have requested information from the blower manufacturer, but I was wondering if anyone here might be able to tell me what this P1/P2 connection might be?Īny suggestions will be greatly appreciated. At the end of P2, there is a triangle that appears to be making contact with a line at the end of P1.Ĭurrently, I have no documentation on this blower other than what I have shown above. The one on the right shows wires labeled "P1" and "P2" connected to W1 and V2. The one on the left shows a jumper between terminals W1 and V2. The manufacturer told us that this new blower should work if we follow the "High" diagram on the wiring diagram and apply 205 VAC across terminals U1 and W1. I know that the old blower worked when we applied 205 VAC across two of the motor terminals, without requiring us to do anything else. The wiring for this new blower/motor is different than that for the one we are trying to replace. The nameplate and wiring diagram for the new blower are shown below. The manufacturer of this machine sent us this blower as a replacement for a different one that had worked fine for quite some time, but then failed. I am trying to troubleshoot a machine that has a blower with a single phase motor.
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