7: TROUBLESHOOTING
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Specifications subject to change without notice.
Page 73 UM10753: 8L Operator's Manual (Version 0321B)
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Cause: There's no power to the VFD.
Probability How-To Steps
Low
1. Power off the machine and the PathPilot controller.
a. Push in the Emergency Stop button on the operator box, which removes power to motion control.
b. From the PathPilot interface, select Exit.
c. Turn the Main Disconnect switch to OFF on the side of the electrical cabinet.
d. Follow correct lockout/tagout procedures.
2. Remove the VFD's cover with a Phillips screwdriver.
3. Identify motor wires #401 and #402 (on the bottom of the VFD). Loosen the set screws above wires #401 and #402
and swap the wire connections. Then, retighten the set screws.
4. Put the VFD cover back, and close the electrical cabinet door.
5. Power on the machine and the PathPilot controller.
a. Turn the Main Disconnect switch to ONon the side of the electrical cabinet.
b. Twist out the Emergency Stop button on the operator box, which enables movement to the machine axes and
the spindle.
c. Press the Reset button on the operator box.
d. Bring the machine out of reset and reference it.
6. From the PathPilot interface, on the Main tab, select Spindle Fwd.
7. Confirm the spindle is rotating in the correct forward direction.
7.15.2 The Spindle Won't Turn
Cause: The motor runs, but the spindle doesn’t turn.
Probability How-To Steps Need More?
Low
Examine the spindle belt for wear or damage.
If the display on the VFD is on, the belt
may be loose or broken. You'll hear the
spindle motor running.
Cause: There's no power to the VFD.
Probability How-To Steps Need More?
—
Examine the VFD display: it has power if its digital lights are on.
When power is removed, the VFD
display remains active until the internal
capacitors dissipate their energy. That
usually takes about five seconds.
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