8 Troubleshooting
Mycom S CLM 153
92
EHauser
Current output signal
incorrect or different
than expected
Incorrect current assignment
Check current assignment: 0–20 mA or
4–20 mA selected?
Incorrect signal assignment
Any current output can be assigned to
any measured value (conduct. 1 or 2,
temp. 1 or 2, characteristic value)
Check under "PARAM" / current
output.
Total load in current circuit too high
(> 500 ohms)
Disconnect output and measure
current directly on instrument
mA Meter for 0–20 mA DC
Feed forward control
does not work
Additional module M3R-x missing
Additional module M3R-2I with 1 or
M3R1I with 2 current inputs
See spare parts list in chap. 8.3
Incorrect version
Resistance input only permissible
with non-Ex.
Feedback input does
not work
Additional module M3R-x missing
See spare parts list in chap. 8.3
Resistance input only permissible
with non-Ex.
Feedback incorrect
Feedback potentiometer outside
range
Smallest permissible potentiometer
1 kOhm, largest permissible
potentiometer 10 kOhms
Feedback range not set or not set
correctly
Set lower and upper range value in
"PARAM" menu
Feedback varies
Connecting cable in non-screened
version
Replace cables with screened cables.
Cable screening not applied to
transmitter.
Apply cable screening to PE rail.
Feedback cable is parallel to h.c.
power line (inductive coupling).
Apply cable screening on PE, both
sides.
Data cannot be saved
No DAT memory module available
DAT available as accessory, s.
chap. 9
Error
Possible cause
Remedial action
Equipment needed, spare
parts
