10
Troubleshooting
10.1
Safety
Prerequisites
DANGER
Risk of explosion through residual voltages and hot surfaces in the device
When the device is switched off, residual voltages and hot surfaces represent an
increased risk of explosion when the device is open.
b
Wait 20 minutes after switching off the main power supply before opening the
enclosure.
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.
DANGER
Risk of explosion through incorrect performance of maintenance work
Incorrect performance of maintenance work in potentially explosive atmospheres can
cause serious injuries to people and damage during operation.
•
Maintenance and commissioning tasks as well as checks should only be carried
out by experienced/trained personnel with knowledge of the rules and regulations
for potentially explosive atmospheres, especially:
–
Ignition protection types
–
Installation procedures
–
Zone classification
•
Standards to be applied:
–
IEC 60079‑14, Annex F: Knowledge, expertise and competence of responsi‐
ble persons, craftsmen and designers
–
IEC 60079-17: Electrical installations inspection and maintenance
–
IEC 60079-19: Equipment repair, overhaul and reclamation
CAUTION
Device damage through short circuit on the device
The internal electronics can be damaged when signal connections are established and
the power supply is switched on. This is also valid for plug connections.
b
Disconnect the GM32 Ex and any connected devices from the voltage supply.
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
79
Subject to change without notice