Error
Possible cause
Tests and / or remedial measures Equipment, spare parts, personnel
Display shows
measured values but
– value does not change
and / or
– instrument cannot be
operated
– Instrument or module not
properly installed in instrument
CUM 223: Reinstall module
CUM 253: Reinstall display module
Refer to assembly drawings in
chapters 8.2.1 and 8.3.1.
– Impermissible operating system
state
Switch instrument off and back on
Possible EMC problem: if problem
persists, call E+H Service to have
installation checked.
Instrument gets hot
– Incorrect voltage / too high
Compare mains voltage and rating
of nameplate
Correct voltage setting,
see chap. 8.4.1 / 8.5.1.
– Power supply unit defective
Replace power supply unit
Can only be diagnosed by E+H
Service.
Incorrect measured
turbidity and / or
temperature value
– Transmitter module defective
(module: MKT1).
Please perform tests and take
measures according to chap. 7.1
to eliminate the sensor or wiring
as the cause of the problem
Test measuring inputs:
Sensor simulation is not possible,
check with new or other sensor
If test fails: replace module (using
correct variant), refer to exploded
views in chap. 8.2.1 and 8.3.1.
If module tests out OK: check
peripherals once more.
– Data transfer fault
Replace LSGA module (AC power
supply unit) or LSGD (DC power
supply unit)
Spare parts list see chap. 8.4.4 or
8.5.4.
– Data transfer problem (EMC)
Check line routing. Separate
sensor line from supply lines
Connect sensor line screen to “S”
terminal, do not ground.
– Wrong sensor cable / cable too
long
Max. line length with extension is
200 m; use only calbe type CYK 8
Current outputs /
incorrect current
– Not calibrated correctly
Test with built-in current simulation,
connecting mA meter directly to
current output
If simulation value is incorrect:
recalibration at factory or new
LSCxx module required.
If simulation value is correct:
check current loop for load and
shunts.
– Load excessive
– Shunt / short-circuit to frame in
current loop
– Incorrect mode of operation
Check whether 0–20 mA or 4–20
mA has been selected
No current output signal
– Current output stage defective
(module: LSCH/LSCP)
Test with built-in current simulation,
connecting mA meter directly to
current output. First disconnect
current output line completely for
safety
If test fails:
Replace controller
(using correct variant)
Additional relays do not
work
– CUM 253: ribbon cable
Pos. 320 loose or defective
Make sure ribbon cable is properly
connected, replace cable if nec.
See Spare parts CUM 253 F
Only 2 additional relays
can be used
– Relay module LSR1-2 with 2
relays installed
Convert to LSR1-4 with 4 relays
Operator or E+H Service
Enhanced functions
(Plus package) not
available
– No or incorrect release code
used
If upgraded: verify that correct
serial number has been used to
order Plus package
Handled by E+H Sales
– Incorrect serial number of
instrument stored in LSCH/LSCP
module
Check whether serial number on
nameplate matches with stored
serial number (can be read in field
S8).
Serial number stored in
LSCH/LSCP module is required to
enable Plus package.
Enhanced functions
(Plus package and / or
Chemoclean) are not
available after
replacement of
LSCH-/LSCP module
– Plus package or Chemoclean
has not been enabled with release
codes.
For new LSCH / LSCP, the
instrument serial number can be
entered
once
in fields E114 to
E116. Next step is to enter release
codes for Plus package and/or
Chemoclean.
A detailed description can be
found in chap. 8.3.5
.
No HART or PROFIBUS
interface function
– Wrong controller
HART: LSCH-H1 or -H2
PROFIBUS-PA/-DP: LSCP-PA/-DP
module, see field E112
Replace controller;
operator or E+H Service
– Wrong software
SW version see field E111
– Bus problem
Remove some instruments and
repeat testing
Contact E-H Service for support
Diagnosis and corrective maintenance
Liquisys M CUM 223 / 253
62
Hauser