SICK ReLy EMSS3

8 Troubleshooting
8.1 Safety
DANGER
H
azard 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
A
dditional 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 Gr
een
No fault
PWR
Ö R
ed
•
Suppl
y voltage too low temporarily or per‐
manently
•
Internal error
PWR
Ö R
ed/green
Error
A
dditional LEDs flash for accurate diagnosis.
OUT
o
Enabling current paths open
OUT
O Gr
een
Enabling current paths closed
OUT
Ö gr
een (1 Hz)
Error in enabling current path
S1
Ö Gr
een
When using without restart interlock: Input
er
ror (e.g. stuck at HIGH)
S1
O Gr
een
Reset pushbutton actuated, N/C contact of the
ac
tuator closed
I1 and I2
Ö Gr
een, alternate
Input error: discrepancy time expired
I1 and I2
Ö Gr
een, simultane‐
ous
Input error: cross-circuit, process error
Y1
o
Enabling current paths closed
Y1
O Gr
een
Enabling current paths open
Y2
o
Output with LOW status
Y2
Ö Gr
een
Reset required
Y2
O Gr
een
Reset pushbutton actuated
TROUBLESHOOTING 8
8023937/2019-10-11 | SICK O P E R A T I N G I N S T R U C T I O N S | ReLy EMSS3
23
Subject to change without notice