Chapter 10
183
UM10349_PCNC1100_Manual_0916A
Troubleshooting
Power Distribution Subsystem Checklist
Table 1.3b
Coolant pump will not run when coolant switch is in auto position
Note: Review Table 1.3a rst
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
DB-25 controller
cable not plugged
in
Medium Re-seat DB-25 controller cable
Likely this symptom will
accompany other motion
symptoms such as no axis or
spindle control. If you can hear
the small relay on the main
control board clicking when
turning the coolant on and off
with the controller, then cables
are seated and working ne.
Fuse on control
board blown
Low
Check fuse F2 on the main control
board.
Remove existing fuse and check
continuity. Replace as needed.
Auto coolant
control relay on
main control
board has failed
Low
With auxiliary input power removed,
measure continuity from wire 202 to
205 while switch pump in auto.
If the relay on the main control
board is not good, then there
should be continuity from 202
to 205 when the pump is on.
NOTE: This relay will fail
if too high of a current draw
passes through it. This is
common when electrical loads
much larger than the Tormach
coolant pump are plugged into
the coolant outlet.
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