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Examine the Jumper Connection Between Terminals B2 and B4

ClosedOverview/Background Information

If you want background information on this problem, go to How Spindle Commands are Processed

ClosedWhat Steps Have I Already Taken?

  • The variable frequency drive (VFD) is powered on
  • The VFD has an inhibit (iH) error

Follow the Troubleshooting Steps to determine the cause of the spindle start failure.

Before You Begin

If you haven't yet done so:

  1. From the PathPilot® interface, in the RPM DRO field, type 1000 and press ENTER on the keyboard.

  2. Click FWD.

  3. Open the electrical cabinet door.

    WARNING! Electrocution Hazard: When servicing the machine from inside the electrical cabinet, always use caution. Points in the electrical cabinet have high voltages that can electrocute or shock you. Even after you've powered off the machine, electronic devices in the electrical cabinet may retain dangerous electrical voltages. Only qualified electrical machinery technicians should perform maintenance or troubleshooting procedures inside the electrical cabinet while power is still on.

  4. Locate the variable frequency drive (VFD).

Troubleshooting Steps

  1. Use a Phillips screwdriver to remove the cross-head screw on the VFD, and then remove the VFD faceplate.

  2. Locate terminals B2 and B4.

  3. Locate jumper J1-4.


Is jumper J1-4 connected to terminals B2 and B4?

  • Yes: This means that the VFD is defective and must be replaced. Tormach Technical Support for guidance on how to proceed.
  • No: You must power off and reconnect jumper J1-4 to terminals B2 and B4. Then, repeat the troubleshooting steps.