8 Trouble Shooting
Product Manual, Control Cabinet IRC5P 3HNA009834-001 en Rev.06 181
8.3 Fault Symptoms and Malfunctions
8.3.7 Pendant does not Communicate
Description The pendant starts up, but does not display any proper screen.
No operator input is possible, and no functions are available.
The pendant is not completely ‘dead’. If it is ‘dead’, proceed as described in section
’Pendant Dead’ on page 180.
Consequences The system may not be operated using the pendant.
Possible Causes The symptom may be caused by (the causes are listed in order of probability):
• The main computer has lost its power supply.
• Communication lines between pendant and main computer not ok.
Recommended Actions
Step Action Comment
1 Make sure the pendant has been correctly
connected to the controller.
How to connect the pendant is described
in ’Pendant Connection’ on page 103.
2 Make sure the power supply is OK and
communication lines are OK.
Check power supply system and signal
lines.
3 Check LED indicators on the front panel. For description, see ’LED Indicator
Panel’ on page 197.
4 Make sure all connections and supplies to the
TIB board are OK.
For information, see ‘Pendant Interface
Board, TIB’ in ‘Unit Description, IRC5P’.
5 Make sure the Ethernet cable between pendant
and TIB is OK.
For information, see ‘Pendant Interface
Board, TIB’ in ‘Unit Description, IRC5P’.
6 If all cables and supplies are OK, and nothing
else seems to solve the problem: Check SIB
board, PIB board and Main Computer.
How to replace the units are described in
chapter ’Repair’ on page 129’.
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