Diagnostics and troubleshooting Liquisys M CPM223/253
86 Endress+Hauser
7.4 Instrument specific errors
The following table helps you during the diagnosis and points to any spare parts required.
Depending on the degree of difficulty and the measuring equipment present, diagnosis is
carried out by:
• Trained operator personnel
• The user's trained electrical technicians
• Company responsible for system installation/operation
• Endress+Hauser Service
Information on the exact spare part designations and on how to install these parts can be
found in the "Spare parts" section.
Error Possible cause Tests and/or remedial measures Execution, tools, spare parts
Display dark, no light-
emitting diode active
No line voltage Check whether line voltage is present. Electrical technician/e.g. multimeter
Supply voltage wrong/too low
Compare actual line voltage and
nameplate data.
User
(data for energy supply company or
multimeter)
Connection faulty
Terminal not tightened;
Insulation jammed;
Wrong terminals used.
Electrical technician
Device fuse defective
Compare line voltage and the nameplate
data and replace fuse.
Electrical technician/suitable fuse;
see drawing in "Spare parts" section.
Power unit defective Replace power unit, note variant.
On-site diagnosis by Endress+Hauser
Service, test module necessary
Central module defective Replace central module, note variant.
On-site diagnosis by Endress+Hauser
Service, test module necessary
CPM253: ribbon cable item 310
loose or defective
Check ribbon cable, renew if necessary. See "Spare parts" section.
Display dark, light-
emitting diode active
Central module defective
(module: LSCH/LSCP)
Renew central module, note variant.
On-site diagnosis by Endress+Hauser
Service, test module necessary
Display is on but
– No change in display
and/or
– Device cannot be
operated
Device or module in device not
correctly mounted
CPM223: reinstall insert.
CPM253: remount display module.
Perform with the aid of the installation
drawings in the "Spare parts" section.
Operating system in unpermitted
mode
Switch device off and then on again.
Poss. EMC problem: if this persists, check
the installation or have checked by
Endress+Hauser Service.
Device gets hot
Voltage wrong/too high
Compare line voltage and nameplate
data.
User, electrical technician
Power unit defective Replace power unit.
Diagnosis only by Endress+Hauser
Service
Measured value pH/mV
and/or temperature
measured value incorrect
Transmitter module defective
(module: MKIC), please first carry
out tests and take measures as per
the "Process errors without
messages" section.
Measuring input test:
– Connect pH, ref and PM directly at the
device with wire jumpers = display
pH 7
– Resistance 100 at terminals 11 /
12 + 13 = display 0 °C
If test negative: replace module (note
variant).
Perform with the aid of the exploded
drawings in the "Spare parts" section.
Current output, current
value incorrect
Adjustment not correct
Check with installed current simulation,
connect mA metre directly to current
output.
If simulation value incorrect: adjustment
in factory or new module LSCH required.
If simulation value correct: check current
loop for load and shunts.
Load too big
Shunt/short to ground in current
loop
Incorrect mode of operation
Check whether 0–20 mA or 4–20 mA is
selected.
No current output signal
Current output stage defective
(module LSCH)
Check with installed current simulation,
connect mA metre directly to current
output.
If test negative:
Renew central module LSCH (note
variant).
No function of additional
relay
CPM253: ribbon cable item 320
loose or defective
Check ribbon cable seating, renew cable
if required.
See "Spare parts" section.
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