Chapter 10
210
UM10350_PCNC770_Manual_0916A
Troubleshooting
Spindle Drive Subsystem Checklist
Table 5.1 (...continued)
Spindle will not turn on in manual or auto
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
VFD has tripped Low
The display will show if the VFD has
tripped. Record the information from
the display should the trip be happening
frequently or should the trip not clear.
VFD trips may be cleared by
removing power from the
VFD for 30 seconds by use of
the Spindle Lockout Key.
The letters tr on the left side
of the display indicate a VFD
trip and the letters on the
right dene the type of trip.
See Table 5.3 for a list of
Spindle VFD Trips.
Err 0 occurs Low Check wiring to braking resistor.
Spindle takes a long time to
slow down.
Belt is loose or broken
or
Sheaves are not xed
to motor or spindle
Low Check the mechanical system.
Power off Main Disconnect
before investigating.
Defective VFD Low
If the display is not on and there is
nominal 120 VAC between wires 143
and 144, the VFD is defective.
If the VFD displays a trip
condition that does not clear
with removal of power, VFD
may be defective.
(connued on next page...)
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