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8.1.3 Fault diagnosis
In case of a fault switch the safety relay off and on again!
LED display
Cause of the fault
Troubleshooting
K1
E1
T1
POWER
K2
E2
Fault
T
Faul
t
• No voltage supply
• Overvoltage
• Connection A1/A3 or A1/A2
reversed
► Check wiring
► Check power supply
K1
E1
T1
POWER
K2
E2
Fault
T
Faul
t
• Wire break
• Feedback contacts open
► Check wiring
► Switch the safety relay off
and on again
K1
E1
T1
POWER
K2
E2
Fault
T
Faul
t
• When voltage is applied:
Feedback contacts open
► Check output circuit
► Check feedback contacts
► Exchange external
contactor
K1
E1
T1
POWER
K2
E2
Fault
T
Faul
t
• Wiring fault
• Short circuit
• Inputs S34 and S43 “1” when
voltage is applied
► Check wiring
► Switch the fail-safe sensor/
switch off and on again
K1
E1
T1
POWER
K2
E2
Fault
T
Faul
t
• Short circuit S33/S43
► Check wiring
K1
E1
T1
POWER
K2
E2
Fault
T
Faul
t
• Short circuit S33/S43
► Check wiring