10.3
Device not functioning
Table 20: Device not functioning
Possible cause
Action
Power supply not connected.
1
Check power cable and connections.
Main power supply has failed.
b
Check power supply (e.g. socket, external disconnecting device).
Internal operating temperatures are
incorrect.
1
Check whether error messages exist.
Internal software not functioning.
Can only occur with complex internal malfunctions or after strong external influences
(e.g., strong electromagnetic interfering pulse).
1
Switch device off and then back on again after a few seconds.
Ex control unit does not switch on.
1
Protective gas feed interrupted or too low.
2
Ex control unit displays an error (see Pressurized Enclosure Manual).
10.4
Evaluation unit not functioning
WARNING
Risk of explosion
Some of the work described in this Chapter assumes an Ex free zone.
b
Wait 20 minutes after switching off the main power supply before opening the
enclosure.
Table 21: Device not functioning
Error indication
Possible cause
Action
Malfunction LED blinks,
(Warning LED possibly
on)
Plain-text error messages indicate possible
causes.
1
Trigger Diagnostic mode by pressing the
“diag” button.
2
Call menu Malfunction (and/or Warning).
3
Check and clear the specified malfunction.
Evaluation unit not
responding
Operating voltage not set correctly.
1
Check operating voltage set.
2
If necessary, replace fuse.
Power supply on evaluation unit incorrect.
1
Provide power supply from plant.
2
Check/reconnect connections on the sys‐
tem components
Defective fuse.
1
Check fuses in the evaluation unit.
2
Exchange when necessary.
Cause cannot be determined.
1
Disconnect all system components from
the power supply and reconnect one at a
time.
2
Check the CAN bus cable from the evalua‐
tion unit to the SR-unit resp. terminal box.
Error occurs again.
b
Replace the last component connected,
contact Service.
24V/5V supply defective.
1
Check 24V/5V supply.
2
Exchange evaluation unit and/or electron‐
ics board module.
3
Contact Service.
TROUBLESHOOTING
10
8019532/100Q/V1-1/2018-08 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM700 Ex
81
Subject to change without notice