Chapter
7
Operating instructions
IN4000 Direct
80
© SICK AG • Germany • All rights reserved
8012183/ZWH0/2018-06-05
Subject to change without notice
Fault diagnosis
en
7.2
Troubleshooting
Problem
Possible cause
Rectification of the
error
No LED
indication
No supply voltage
⋅
Switch the voltage
supply on.
•
Power
LED does
not flash.
•
Sensor
does not
switch.
•
Undervoltage
•
Overvoltage
⋅
Check supply
voltage (see 9.1
“Data
•
Power
LED is
off.
•
Signal
LED
flashes.
Internal or
external fault
⋅
Undamp/damp
⋅
Switch the voltage
supply off and
back on again.
⋅
Test the
connections and
their wiring.
⋅
Rectify possible
cross-circuits.
⋅
Test the
components
connected, e.g.
the PLC.
⋅
Replace the
device.
Tab. 8: Trouble-
shooting for the
IN4000 Direct
(LED indicators
see 3.4 on
page 62)