Chapter 10
182
UM10350_PCNC770_Manual_0916A
Troubleshooting
Power Distribution Checklist
Table 1.2a
Coolant pump will not run when coolant switch is in the On position
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
Coolant pump
not plugged into
outlet
High Check the plug Plug it in if required
Breaker turned
off in electrical
cabinet supplying
PCNC tripped
Medium Check the breaker
Turn it on and/or reset
if required
Main Disconnect
in off position
Low Check the switch Turn it on if required
Fuse in FU6
cabinet is blown
Low Check fuse Replace as needed
Power Distribution Checklist
Table 1.2b
Coolant pump will not run when coolant switch is in Auto position
Note: Review Table 1.2a 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, like no axis or
spindle control. If you can hear
the small relay on the main
control board clicking when
turning coolant on and off via
the controller, then cables are
seated and working ne.
Fuse on control
board blown
Low Check fuse F2 on 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 no continuity from
wires 120 to 126 when pump is
commanded 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 factory coolant pump are
plugged into the coolant outlet.
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