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Federal Pacific Contactor swap out of Deltrol/with thermal overload!

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  • Federal Pacific Contactor swap out of Deltrol/with thermal overload!

    I'm changing out the FP contactor with a new Deltrol contactor and thermal overload/with heater. I have the Motor Start Relay with 8 wires, I believe it's the 3 pole MSR. The Deltrol is I believe 110 volts and I'm not sure on the wiring for the 110v coil and the Motor Start Relay. I have two wires from the Fed Pac. contactor from terminal 2 & 10 that goes to the MSR and I see where the wire from terminal 10 goes on the thermal overload and not sure where terminal wire 2 goes on the thermal overload/deltrol contactor. Thanks for the help, Bruce

  • #2
    Bruce:
    Move the wire that is on the MSR that goes to terminal H down to G, this will give you 110VAC to the Deltrol coil.
    rfm

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    • #3
      Thanks Roscoe!! I hook it up like the directions and I burnt the coil of the Deltrol and new something was wired wrong!! Thanks again

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      • #4
        Originally posted by Roscoe View Post
        Bruce:
        Move the wire that is on the MSR that goes to terminal H down to G, this will give you 110VAC to the Deltrol coil.
        Sorry Roscoe...but that would actually be incorrect. That IS what the instructions state to do but it puts the coil of the contactor around the fuse and not in-line with it. You should have one wire going from the contactor coil (6) to E of the motor start relay. There should then be a wire from F of the motor start relay to TS1-H. On the other side of the motor contactor coil (5), there should be a wire going to TS1-G. (Some drawings show the motor contactor coil as being labeled 1 and 2 instead of 5 and 6)

        The reason the original instructions are incorrect is that the other wire from the motor contactor goes to TS1-E (or B which is jumpered to E on older converted machines)...this would give the old contactor coil a voltage of 208/230 between TS1-E and TS1-H. Properly wired, the original contactor coil should have two wires going to the motor start relay. Those two wires went to a switch for each one of those wires. From there...the other side of the switches would run to TS1. One of them would go to E (or B depending on age) while the other would go to H. By moving the one from H to G...you would not have the proper protection for the coil. Although you would have the proper voltage, there is no protection...and if the fuse does blow...you could send 208/230 to the coil and possibly burn it up.

        Hope this helps...
        TSM & TSM Training Development
        Main Event Entertainment
        480-620-6758 for help or information

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