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Trouble-shooting
9.4
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
• Responsible 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
No line voltage
Supply voltage wrong/too low
Connection faulty
Display dark, no light-
emitting diode active
Device fuse defective
Power unit defective
Central module defective
OPM253: ribbon cable item 310
loose or defective
Display dark, light-
Central module defective
emitting diode active
(module: LSCH/LSCP)
Device or module in device not
Display is on but
correctly mounted
– No change in display
and/or
Operating system in unpermitted
– Device cannot be
mode
operated
Voltage wrong/too high
Device gets hot
Power unit defective
Transmitter module defective
Measured value pH/mV
(module: MKIC), please first carry
and/or temperature
out tests and take measures as per
measured value
the "Process errors without
incorrect
messages" section.
Adjustment not correct
Load too big
Current output, current
Shunt/short to ground in current
value incorrect
loop
Incorrect mode of operation
Current output stage defective
No current output signal
(module LSCH/LSCP)
84
Instrument specific errors
Tests and/or remedial measures
Check whether line voltage is present.
Compare actual line voltage and
nameplate data.
Terminal not tightened;
Insulation jammed;
Wrong terminals used.
Compare line voltage and the
nameplate data and replace fuse.
Replace power unit, note variant.
Replace central module, note variant.
Check ribbon cable, renew if
necessary.
Renew central module, note variant.
OPM223: reinstall insert.
OPM253: remount display module.
Switch device off and then on again.
Compare line voltage and nameplate
data.
Replace power unit.
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
Check with installed current simulation,
connect mA metre directly to current
output.
Check whether 0–20 mA or 4–20 mA is
selected.
Check with installed current simulation,
connect mA metre directly to current
output.
OPM223/253
Execution, tools, spare parts
Electrical technician/e.g. multimeter
User
(data for energy supply company or
multimeter)
Electrical technician
Electrical technician/suitable fuse;
see drawing in "Spare parts" section.
On-site diagnosis by responsible
service, test module necessary
On-site diagnosis by responsible
service, test module necessary
See "Spare parts" section.
On-site diagnosis by responsible
service, test module necessary
Perform with the aid of the installation
drawings in the "Spare parts" section.
Poss. EMC problem: if this persists,
check the installation or have checked
by responsible service.
User, electrical technician
Diagnosis only by responsible service
If test negative: replace module (note
variant).
Perform with the aid of the exploded
drawings in the "Spare parts" section.
If simulation value incorrect: adjustment
in factory or new module LSCH/LSCP
required.
If simulation value correct: check
current loop for load and shunts.
If test negative:
Renew central module LSCH/LSCP
(note variant).
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