8.2.4
Fault indicators for a safe series connection with T-connectors or in the control cabinet
If an error occurs in a device in a series connection, the affected device displays the
error and switches off the OSSDs (STATE LED flashes red). All downstream devices
switch off their OSSDs (LED STATE flashes red, LED DIAG flashes yellow).
1
DIAG
STATE
2
3
4
5
DIAG STATE
DIAG
STATE
DIAG
STATE
DIAG
STATE
6
6
7
8
8
!
Figure 19: Fault indicators for safety switches in series connection In the example: Internal error
on safety switch 3
1
–
5
Safety switch
6
LED STATE lights up green
7
LED STATE flashes red
8
LED STATE flashes red, LED DIAG flashes yellow
What to do with safety switches switched in series:
•
Isolate the faulty sensor and check it separately.
•
Check wiring for cross-circuits and short-circuits.
•
Switch the voltage supply off and on. If the fault still occurs after this, the sensor is
defective. Replace sensor.
8.2.5
Fault displays during teach-in
Table 17: Fault displays during teach-in
STATE light emitting
diode (red/green)
STATE light emitting
diode (yellow)
Cause
Ö
red/green
Ö
yellow
The maximum number of actuators has been
taught in. It is not possible to carry out another
teach-in process.
Ö
red/green
O
yellow
An actuator that has already been taught in
needs to be taught in again. This is not possi‐
ble.
Ö
red/green
o
Teach-in sequence failed. Teach in the actuator
again. Possible fault:
•
Actuator removed from response range too
early.
•
Voltage supply not isolated in a timely man‐
ner.
Fault displays are repeated until the equipment is reset.
b
To perform a reset, disconnect the voltage supply for at least 3 s.
8
TROUBLESHOOTING
32
O P E R A T I N G I N S T R U C T I O N S | STR1
8018754/12IU/2020-01-30 | SICK
Subject to change without notice
