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Background

The spindle is the rotating assembly that holds the tool/tool holder. It’s powered by a motor that can either be integral or – like most of our machines – external, relying on a belt and pullies to transmit the power.

Info

The VFD that controls the motor doesn't power on with the machine. Instead, it turns on after you command the spindle to start.

Tools

  • Multimeter

  • Adjustable wrench

  • Screwdriver set

Table of Contents

Table of Contents
minLevel2
maxLevel7
stylenumber

Verify speed was commanded properly

Reason: Commanded speed did not execute.

To command a specific RPM in PathPilot, you enter your desired speed, and then you MUST press enter for the machine to accept the commanded speed. Then proceed to hit FWD or REV.

Verify all safety switches are closed

Reason: A door is open, tripping the machine into reset or emergency stop condition.

  1. Verify that the spindle door is closed.

  2. If you mill is equipped with the optional door safety switch, make sure your enclosure doors are closed, and the switch is latched.

Inspect and/or re-tension the belt

Reason: The belt is loose, worn, or damaged.

...

  1. Open the spindle motor door and visually inspect the belt to ensure there is not excessive wear or damage.

  2. Firmly push the spindle belt between the pulleys. If it is properly tensioned, the spindle belt should move between 3 mm (0.125 in.) and 6 mm (0.25 in.). If it's not properly tensioned, continue with the following steps.

  3. Unclamp the motor mounting plate: Loosen the clamp handle.
    This allows the spindle motor plate to pivot.

  4. Tighten the spindle belt: Push the pivot handle backward (toward the machine column).

  5. Secure the motor mounting plate: Tighten the clamp handle.

  6. Firmly push the spindle belt between the pulleys. If it is properly tensioned, the spindle belt should move between 3 mm (0.125 in.) and 6 mm (0.25 in.). If it's not properly tensioned, repeat Steps 3 through 5.

  7. Close the spindle motor door.

The Variable Frequency Drive (VFD) isn’t getting power

Examine the spindle door and its switch

Reason: The door is open or the switch is malfunctioning.

  1. Examine the spindle cover door to verify that it's closed, being held closed, and the switch is being depressed.

Reset the brake resistor’s thermal switch

Reason: The thermal switch tripped and needs to be reset. (770M, 770MX, 1100M, 1100MX)

  1. Reset the thermal switch (TS1) as follows:

    1. Power off the machine.

    2. Allow the brake resistor to cool.

    3. Press the reset button (between the thermal switch’s two terminals) to reset the thermal switch.

Verify that the spindle run/start is working

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

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title24R

  1. Examine wires 420 and 422 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 421 to wire 422. Make a jumper wire and, carefully,
      momentarily jumper wires 422 and 420.

      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 422 to 420 via a relay to create the start pulse. Measure wire 422 for 24 Vdc power. If present, the control board or wire 420 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 420 may be broken. Lift the connections of wire 420 at the control board and K2 and measure continuity.

Verify that the VFD is getting power

Reason: The VFD is defective.

  1. Using a multimeter, confirm you have power getting to the VFD between L1 and L3.

    1. If there is power but nothing on the display, contact Tormach Technical Support.

    2. If there is no power, review the previous solutions to try and re-establish power.

  2. If there is a trip or error code that does not clear after power cycling the machine, contact Tormach Technical Support.

Measure the motor resistance (Ω)

Reason: The motor has an internal short and is malfunctioning.

  1. Power off the machine.

  2. Wait 30 seconds, and then remove the U, V, and W wires from the VFD terminals.

  3. Measure the resistance between the following wires to see if it is approximately 2-4 Ω:

    1. Wires U and V

    2. Wires U and W

    3. Wires V and W

  4. Measure the resistance between the following wires to verify that it is >1M Ω or OL, indicating that there is no short:

    1. Wire U and Ground (bare exposed metal or a green and yellow wire with a PE label)

    2. Wire V and Ground (bare exposed metal or a green and yellow wire with a PE label)

    3. Wire W and Ground (bare exposed metal or a green and yellow wire with a PE label)

  5. Numbers outside of the specified range indicate that the motor or its wiring is bad and needs to be replaced. Perform the same test on the motor cable connector, if applicable.

Identify the VFD code and solution

Reason: The VFD is tripped and showing an error.

Trip Code

Condition

Likely Cause

boot

Boot from SD card.

Displayed for first 5-6 seconds after power up when booting from SD card. (M200/C200 only)

UU

DC-BUS under-voltage.

This happens when the VFD is powered down or loses power.

OU

DC-BUS over-voltage.

Braking resistor failed open or wiring connection open between the VFD and the resistor. Resistance to measure 70 ohms.

OI.AC

VFD output instantaneous over current.

Phase-to-phase or phase-to-ground short on output of VFD to motor. This trip code cannot be reset until 10 seconds after the trip was initiated.

OI.br

Braking resistor instantaneous over current.

Braking resistor shorted or partially shorted out or short in wiring between the VFD and the resistor. Resistance to measure 70 ohms. Check brake resistor wiring.

It.br

I2t (power) on braking resistor.

Excessive braking resistor energy caused by too frequent and too severe deceleration cycles or AC supply voltage too high.

It.AC

I2t (power) on VFD output current (used to
protect motor).

Spindle motor is working too hard. Ensure that the spindle is not jammed or sticking. Consider running the spindle motor at half speed for 10 minutes with no load to cool the motor down.

Oht.C

VFD is working too hard and stops to cool power electronics down to prevent failure.

Spindle motor is working too hard. Stop running the spindle but leave the VFD power on and let the power electronics cool down.

Oht.I

Heat sink temperature is too high because the VFD is working too hard and stops to cool power electronics down to prevent failure. Cabinet may also be too hot.

Spindle motor is working too hard or it is too hot in work location. Stop running the spindle but leave the VFD power on and let the power electronics cool
down. Check to see if the fan on the VFD is running and check filters on the cabinet. Cool work location down if required.

HF01 through HF23

Hardware fault.

Failed drive.

Inspect the VFD program

Reason: The wrong program has been loaded or is running on the VFD.

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