Chapter9 Troubleshooting; Checking The Condition By Each Problem - Mitsubishi Electric MELSEC QS Series User Manual

9
TROUBLESHOOTING

CHAPTER9 TROUBLESHOOTING

This chapter describes the details of the problems that may occur in the CC-Link Safety
System, and lists the check items and procedures for each of the possible problems.

9.1 Checking the Condition by Each Problem

The following lists the details of the check items and procedures for each problem
occurrence.
Description of problem
Is there any breakage on
CC-Link dedicated
cables?
Are terminating resistors
connected to the stations
located at both ends of the
CC-Link Safety system?
Are correct terminating
resistors used?
Unable to perform data
link for the entire system.
Are CC-Link dedicated
cables being used?
Are different types of CC-
Link dedicated cables
used together?
Has any error occurred in
the safety CPU module?
Has any error occurred on
the safety power supply
module?
Check item Check procedure
Check the CC-Link
dedicated cables (for
breakage, short-circuit,
incorrect wiring, poor
contact or
nonconformance) visually
or by the CC-Link
diagnostics line test.
Visually check the
connection of the
terminating resistors.
Visually check the
terminating resistors.
Check the specifications
of the cables.
Check the "ERR" LED of
the safety CPU module.
Check the "POWER" LED
on the safety power
supply module.
9.1 Checking the Condition by Each Problem
Check result
Remove the cause of the
A cable fault is found. fault and correct the
connection.
No cable fault is found. Check other items.
Terminating resistors are Connect the terminating
not connected to the resistors supplied with the
terminal stations, or they safety master module to
are connected to any the terminal stations in the
other stations. CC-Link Safety system.
Terminating resistors are
connected to the terminal Check other items.
stations.
Terminating resistors Connect the terminating
other than the ones resistors supplied with the
supplied with the safety safety master module to
master module are the terminal stations in the
connected. CC-Link Safety system.
Terminating resistors that
are supplied with the
Check other items.
safety master module are
connected.
They are not CC-Link Use CC-Link dedicated
dedicated cables. cables.
Different types of CC-Link
Use only one type of CC-
dedicated cables are used
Link dedicated cables.
together.
Only one type of CC-Link
Check other items.
dedicated cables is used.
Perform troubleshooting
"ERR." LED is ON or
for the safety CPU
flashing.
module.
"ERR." LED is OFF. Check other items.
Turn OFF the power and
then ON. If the error
"POWER." LED is OFF. persists, replace the
safety power supply
module.
"POWER." LED is ON. Check other items.
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Corrective action
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