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Reason: The spindle start signal from the control board isn’t working.

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title1100MX, 770MX, 1100M, 770M, 8L CLICK TO EXPAND

  1. Examine wires 434 and 436 for 24 Vdc on wires J10.1 and J10.3, respectively.

  2. Start the spindle and listen for a soft, audible click on the control board. If you hear this click (from a relay contact on the board), the machine control board is functioning properly. If you don't hear the click:

    1. Verify that there's 24 Vdc measured from wire 400 to wire 434. Make a jumper wire and, carefully,
      momentarily jumper wires 434 and 436.

      1. If contactor K2 pulls in (you will hear an audible clunk) while you have the jumper on but drops out as soon as you remove the jumper, review the previous solutions to inspect why the K2 isn’t holding.

      2. If K2 stays powered on, the control board is not passing the run signal to the circuit. The control board passes 24 Vdc from wire 434 to 436 via a relay to create the start pulse. Measure wire 434 for 24 Vdc power. If present, the control board or wire 436 connected to J10.3 is defective. Power off the machine, and jumper J10.1 to J10.3 Power on the machine and check the VFD for a display. If the VFD reads rdy, the control board is defective. If not, wire 436 may be broken. Lift the connections of wire 436

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title24R CLICK TO EXPAND

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Examine wires 420 and 422 for 24 Vdc on wires J10.1 and J10.3, respectively.

Start the spindle and listen for a soft, audible click on the control board. If you hear this click (from a relay contact on the board), the machine control board is functioning properly. If you don't hear the click:

Verify that there's 24 Vdc measured from wire 421 to wire 422. Make a jumper wire and, carefully,
momentarily jumper wires 422 and 420.

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If contactor K2 pulls in (you will hear an audible clunk) while you have the jumper on but drops out as soon as you remove the jumper, review the previous solutions to inspect why the K2 isn’t holding.

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      1. at the control board and K2 and measure continuity.

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titlePCNC 770, PCNC 1100, 15L CLICK TO EXPAND

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Verify that the VFD is getting power

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  • Push the M button on the front panel of the VFD. The display will change to 01___0.0 with the 01 blinking.

  • Momentarily push the up arrow key to the right of the M key.

    1. The 01 should change to 02.

    2. Take note of the number to the right of the 02.

    3. The VFD should read 170.x, where x designates the VFD program version.

  • If the VFD does not display this value, it needs to be reprogrammed.

    • Exit by pressing and holding the M button until the display reverts.

    VFD Model

    How to inspect the VFD program

    Commander SK

    M200 and C200

    1. Push Enter on the front panel of the VFD twice.

      1. The display changes to 00.000, with the .000 blinking.

    2. Repeatedly push the Up Arrow until .000 changes to .011.

    3. Push Enter again.

      1. The display shows the model of the mill or accessory (for example, 1100 for an 1100M, or RT11 for a RapidTurn on an 1100M).

    4. Push the Up Arrow once more, and the VFD displays parameter .012, which is the software version number (for example, version 2.01).

    5. Push Back to exit this mode.

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