Trouble-shooting
Liquisys M CPM223/253
92
Hauser
9.4
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
• 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 Hauser
Service, test module necessary
Central module defective
Replace central module, note variant.
On-site diagnosis by 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 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
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 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
Ω
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/LSCP
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/LSCP)
Check with installed current simulation,
connect mA metre directly to current
output.
If test negative:
Renew central module LSCH/LSCP (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.
Only 2 additional relays can
be triggered
Relay module LSR1-2 installed with 2
relays
Upgrade to LSR1-4 with 4 relays.
User or Hauser Service
