Standard Electric Help with wiring my Lathem Master Clock to a Standard Electric Secondary Clock?

Discussion in 'Electric Horology' started by StandardElectricCollector, Jul 4, 2017.

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  1. StandardElectricCollector

    StandardElectricCollector Registered User

    May 26, 2017
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    #1 StandardElectricCollector, Jul 4, 2017
    Last edited by a moderator: Jan 24, 2018
    I have a Lathem Master Clock Model No. LTR8-512M, Serial No. L-103383, Eprom V5.01, Volts/Cycle 120/240 50/60, Amps/watts 30W Max, Signal Circuit 10 Amps which will be wired to a Standard Electric Time Co. Secondary Clock, Type: FMT-SQ-12, GRC,
    Volts 120, Cycles: 60, Drive Motor: 5 Watts Max, Reset Motor: 5 Watts Max,
    Manufactured MAR 1961 Flextron. I am not sure on how to wire this properly from this wiring diagram. Can someone please help! Thank You in advance S.E.C.~


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  2. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    The motors are AC motors and don't care which way they are wired.
    Choose one end of the each motor's wires as the common return. The others
    go to the terminals shown in the schematic.
    Tinker Dwight
     
  3. StandardElectricCollector

    StandardElectricCollector Registered User

    May 26, 2017
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    Thank you for your response. I would like to follow the schematic but still having issues with what wire goes what #
    Terminal. If possible could you be more specific? The run motor in goes to what number ?
    The correction motor goes to what number?
     
  4. StandardElectricCollector

    StandardElectricCollector Registered User

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    Also, what are the #1's in the triangles V250LA4 MOV. OR EQUIV./Transient Voltage Suppression Diodes/external diodes or MOV's (Metal-Oxide Varistors) protect all relay contacts? Those triangle looking figures. How do these work in this diagram circuit? What does it mean by all circuits should be fused or protected by a circuit breaker (10Amp maximum). Would I need to include these things or are they already in the circuit board from looking at the pictures?

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  5. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    #5 Tinker Dwight, Jul 6, 2017
    Last edited: Jul 6, 2017
    The first schematic you show is for the old style movement, like
    you have. You could use either CLK1 or CLK2.
    The schematic shows that you need an external MOV across each
    motor.
    I states you need a fuse in the AC input.
    The circuit board has MOVs but the schematic shows external one in
    addition. They go across the motor leads.
    Note 4 is quite clear that these are external that you need to add.
    The fuse, on the board, is for the controller electronics and not for the
    movement.
    You need an additional fuse for the clock ( I'd advise a 1 to 3
    amp fuse for just one clock movement ).
    I'm not sure what your confusion with the motors is. The run motor
    has one lead to terminal 2 and the correction to terminal 8. I think
    the schematic is clear on that. The other two leads go to the AC
    return.
    The schematic shows a jumper from 1 to 3 and another from
    4 to 7 when these terminals are used for a clock.
    Maybe you can be more clear on your problem??
    If you really don't understand the schematic, you really should
    have an electrician wire it for you. The schematics are quite
    clear and it worries me that you have issues with them.
    The manual shows the old style ( like you have ) on either CLK1 or
    CLK2.
    P4 is power for the electronics. It shows two different jumper options.
    One for 120 and the other for 240. If you are going to use 120, only
    put the two jumpers.
    Your picture shows your unit configured with two jumpers
    for 120V.
    You are not using P3.
    Tinker Dwight
     
  6. StandardElectricCollector

    StandardElectricCollector Registered User

    May 26, 2017
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    Thank You for taking your time in writing this response, and for all your help. I have basic electrical skills and have wired many things before. I was mostly confused on the MOV's and how they are to be put in line wired to the AC return.
    S.E.C.~
     
  7. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    At the clock end, use wire nuts to connect the wires to the controller.
    Put the leads of the MOV into the two wire nuts, along with the wires
    returning to the controller. There are two leads from the motor. The MOV
    must be parallel with the motor.
    I would run 4 wires to the clock and connect the two common return wires
    at the controller to the neutral AC with a wire nut there.
    Tinker Dwight
     
  8. StandardElectricCollector

    StandardElectricCollector Registered User

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    Thank You very much for all your responses
     
  9. StandardElectricCollector

    StandardElectricCollector Registered User

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    Yay! I finally got one of my clocks running, but I would like to get my other two clocks running in series. When running the Standard Electric Secondary Clock's in series do I run the AC return to the AC in of the next clock and so on down the line?
    Thank You in advance and I look forward to every ones responses!
    ~S.E.C.
    (Special Thanks to Tinker Dwight)
     
  10. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    The clocks should all be in parallel, not series. The motors are synchronous
    AC motors.
    Think of 3 long lines from the master. Each clock has one run, one correction and
    one return, to attach to one of the three lines.
    Tinker Dwight
     

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