Chapter 10
190
UM10349_PCNC1100_Manual_0916A
Troubleshooting
Controller Communications Subsystem Checklist
Table 3.1
Controller communication cannot be established
(Controller LED cannot be turned on)
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
Control power is off
Medium
Power on control power following
power off/on procedure detailed in
chapter 3, Installation.
Refer to Control Power Subsystem
earlier in this chapter.
Ribbon cable J4
between bulkhead
connector and the
control board is
not plugged in
Medium
Check the connections on both ends
and ensure they are rmly seated.
The connection at the control
board has been known to
loosen up during shipping.
DB-25 cable is
not connected
properly between
the controller and
the mill
Medium
Check the cable connections. Check the
cable and connector (pins) for damage.
Swap out old cable for new
cable, if possible.
Mill interface board
defective
Low Try a new mill interface board. —
Control board
defective
Low Swap boards
Likelihood of defective board
is slim.
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