18
10 Troubleshooting
Problem
Possible cause
Troubleshooting
No LED display
No voltage supply
Apply voltage
The device does not
switch, not even after
undamping and re-
damping
The device was brought into the safe
state (logic "0"). Cause:
• Cross fault between both outputs A1
and A2
• Cross fault between one output (A1
or A2) and the supply voltage
• Error in the device detected
• Remove the cross
fault
• Replace device
11 Maintenance, repair and disposal
If used correctly, no maintenance and repair measures are necessary.
Only the manufacturer is allowed to repair the unit.
u
After use dispose of the device in an environmentally friendly way in
accordance with the applicable national regulations.
12 Terms and abbreviations
OSSD
Output Signal Switching Device
Output signal switch element
PDDB
Proximity devices with defined
behaviour under fault conditions
Näherungsschalter mit einem definierten
Verhalten unter Fehlerbedingungen
PFH
(PFH
D
)
Probability of (dangerous) Failure
per Hour
Probability of a (dangerous) failure per hour.
PL
Performance Level
PL to EN ISO 13849-1
SIL
Safety Integrity Level
Safety Integrity Level
SIL 1-4 to IEC 61508 The higher the SIL,
the lower the probability that a safety func-
tion will fail.
SIL
cl
Safety Integrity Level
claim limit
Safety Integrity Level
claim limit
(according to IEC 62061)
T
M
Mission time
Duration of use according to EN 60947-5-3
(= max. service life)
