Trouble-shooting
Liquisys M CPM223/253
90
Hauser
Measured value fluctuations
Interference on measuring cable
Connect cable as per wiring diagram.
See "Electrical connection" section.
Interference on signal output line
Check line routing, lay line separately if
necessary.
Signal output and measuring input lines
Interference potential in medium
Measure symmetrically (with PML).
Poss. ground medium with PM/PE
connection.
No potential matching (PA/PM) for
symmetrical input
Connect PM pin in assembly with devices
PA/PM.
Controller/limit contact
does not work
Controller switched off
Activate controller.
See "Relay contact configuration" section or
fields R2xx.
Controller in operating mode
"Manual/off"
Select "Auto" or "Manual on" mode.
Keyboard, REL key
Pick-up delay set too long
Switch off or shorten pick-up delay time.
See fields R2xx.
"Hold" function active
“Auto hold” for calibration,
“Hold” input activated,
“Hold” active via keyboard.
See fields S2 to S4.
Controller/limit contact
works constantly
Controller in operating mode
"Manual/on"
Set controller to "Manual/off" or "Auto".
Keyboard, REL and AUTO keys
Drop-out delay set too long
Reduce drop-out delay time.
See fields R2xx.
Control circuit interrupted
Check measured value, current output or
relay contacts, adjusters, chemical supply.
No pH/mV current output
signal
Line open or short-circuited
Disconnect line and measure directly at the
device.
mA metre 0–20 mA DC
Output defective
See "Diagnosis" section.
Fixed pH/mV current
output signal
Current simulation active
Switch off simulation.
See field O2.
Impermissible processor system
operating status
Switch device off and then on again.
EMC problem: if it persists, check the
installation.
Incorrect current output
signal
Incorrect current assignment
Check current assignment:
0–20 mA or 4–20 mA?
Field O211
Overall burden in the current loop too
high (> 500
Ω
)
Disconnect output and measure directly at
the device.
mA metre for 0–20 mA DC
Current output table is not
accepted
Value distance too small
Select practical distances.
No temperature output
signal
Device does not have a second current
output
Check version using nameplate, if
necessary, replace module LSCH-x1.
Module LSCH-x2,
See "Spare parts" section.
Device with PROFIBUS-PA
PA device does not have any current
output!
Chemoclean function not
available
No relay module (LSR1-x) installed or
only LSR1-2 available
Install LSR1-4 module.
The Chemoclean is enabled using the
release code supplied by E+H in the
Chemoclean retrofit kit.
Module LSR1-4, see "Spare parts" section.
No functions from Plus
Package available
Plus Package not enabled (enable by
entering a code which depends on the
serial number and which is supplied by
E+H when a Plus Package is ordered)
– For Plus Package retrofit: enter code
supplied by E+H.
– Following replacement of a defective
module LSCH/LSCP: first enter device
serial number (see nameplate) by hand,
then enter existing code number.
For a detailed description, see "Replacing
central module" section.
No HART or PROFIBUS
communication
Several devices at the same address
Check addresses and re-enter if necessary.
No communication possible for several
devices of the same address.
Errors
Possible cause
Tests and/or remedial measures
Tools, spare parts
