Operating Instructions Chapter 7
DME4000
8014584/ZN33/2017-07 © SICK AG • Germany • Subject to change without notice 103
7 Maintenance
The DME4000 does not require any maintenance.
We recommend that you (at regular intervals):
Clean the optical lens surfaces
Check the screw and plug connections
8 Troubleshooting and Explanation of Terms
8.1 Troubleshooting
BUS indicator
RS 422: request mode
PROFIBUS/DeviceNet: no data flow
CANopen: no data flow
check clock-pulse generator
RS 422: continuous mode
PROFIBUS/DeviceNet: check wiring and shielding
CANopen: (pre-)operational mode or check wiring
indicator
Pre-failure message for measurement
laser
The measurement laser is still ready for operation,
but it is at the end of its operating life;
have replace sensor ready
Pre-failure message: Attenuation
The measured values are still OK; clean the optical
surfaces (reflector, lens)
Internal sensor temperature at fringe
range
Check ambient temperature; if necessary, improve
ventilation. Protect against radiating heat, e.g.,
provide shade against direct sunlight. Use the
sensor with heating when the temperature is low
Light path to reflector interrupted
With simultaneous ATT indicator: Lens
or reflector soiled
c)With simultaneous LSR indicator:
Laser defect
Observe light spot on the reflector; it may not move
away from the reflector. If necessary, realign or use a
larger reflector
Clean lens or reflector
c) Laser is defect; replace the sensor
(blinking
indicator)
Check supply voltage, voltage off/on, if not self-
repairing; Contact the service department
Sensor temperature not within
specifications
(internal temperature < –15 °C: Wait until warm-up
phase finishes. It might be necessary to use the
sensor with heating
Sensor too warm
(internal temperature > 80 °C:
Let sensor cool down
Effect: Measured value output is set to
zero
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