Diagnosis with LED
Potential cause of error
What must be done?
LED
doesn’t
blink green
Wrong power supply
Check the power supply
12…30V DC
, the correct polarity and the cable
connection
Reset of MWF necessary
Interrupt the power supply in order to restart the device
If the LED is not blinking after the restart, please proceed with step 27.1
LED blinks green
DIP switch not in position 0
Put
all
DIP switch levers in the upper position off/0
Analysis device or display shows no or
wrong values
Measure current of the analogue output signal
4..20mA
with a multimeter
1.
If no current is measurable, interrupt the power supply in order to
restart the device
2.
If no current is measurable after the restart, please proceed with step
27.1
3.
If the measured current correlates to the filling level (e.g. 12 mA at a
filling height of 50 %), please check the analysis device, display or the
connection
LED blinks green and the
measured current
doesn’t
correlate to the filling level
Probe touches silo wall, installed
equipment or nozzle
Remove probe from silo wall, installed equipment or nozzle and make
sure that the distance to them is sufficient
Cornice near the probe
Remove cornice near the probe
Bridges in the silo
Remove bridges in the silo and avoid bridge building
Larger caking to the probe
Remove larger caking and clean the probe
Probe buckled
Straighten the probe or renew it
Probe released from the device
Install probe or renew it
Tensioning weight released from the
rope
Install tensioning weight or renew it
Parameterisation not correct
Adapt parameterisation after consultation of MOLLET
27.1
If the malfunction persists, the MWF has to be returned to MOLLET for review of the device function.
28. Returns
e. g. flammable, toxic, caustic or cancer-producing.
28.2
Furthermore please state:
- Chemical and physical characteristics of the the bulk goods or
liquid
28.1
Remove all adherent material residues of filling material from the
MWF. Be aware of seal grooves and cracks where material residues
could stick.
In particular if the bulk goods or liquids has been dangerous to
health,
- Operating time of the MWF
- Description of the failure occurred
- Description of the application
M LLET
Füllstandtechnik
GmbH
10
MWF-BA-10 03/20
©
by MOLLET
27. Troubleshooting
Operating instruction MOLLET D-74706 Osterburken Tel. +49 6291 6440-0 Fax +49 6291 9846
Microwave level measurement
MWF
