8
Troubleshooting
8.1
Safety
DANGER
Hazard due to lack of effectiveness of the protective device
In the case of non-compliance, it is possible that the dangerous state of the machine
may not be stopped or not stopped in a timely manner.
b
Immediately shut the machine down if the behavior of the machine cannot be
clearly identified.
b
If a machine fault cannot be definitively determined or safely rectified, immediately
shut the machine down.
b
Secure the machine so that it cannot switch on unintentionally.
NOTE
Additional information on troubleshooting can be found at the responsible SICK sub‐
sidiary.
8.2
Status indicator (LED)
Table 4: Fault indicators and operational statuses
LED
Status
Possible cause
PWR
o
No supply voltage
All LEDs
Ö
All colors
Initialization with LED test
PWR
O
Green
No fault
PWR
Ö
Red
•
Supply voltage too low temporarily or per‐
manently
•
Internal error
PWR
Ö
Red/green
Error
Additional LEDs flash for accurate diagnosis.
OUT
o
Enabling current paths open
OUT
O
Green
Enabling current paths closed
OUT
Ö
Green
Error in enabling current path
S1
Ö
Green
When using without restart interlock: Input
error (e.g. stuck at HIGH)
S1
O
Green
Reset pushbutton actuated, N/C contact of the
actuator closed
I1 and I2
Ö
Green, alternate
Input error: discrepancy time expired
I1 and I2
Ö
Green, simultane‐
ous
Input error: cross-circuit, process error
Y1
o
Enabling current paths closed
Y1
O
Green
Enabling current paths open
Y2
o
Output with LOW status
Y2
Ö
Green
Reset required
Y2
O
Green
Reset pushbutton actuated
8
TROUBLESHOOTING
24
O P E R A T I N G I N S T R U C T I O N S | ReLy EMSS1
8020868/ZX84/2018-11-15 | SICK
Subject to change without notice
