Mycom S CLM 153
8 Troubleshooting
Hauser
91
8.1.2
Process-specific errors
Error
Possible cause
Remedial action
Equipment needed, spare
parts
Instrument
unconfigurable,
Display for code prompt
is 9999
Instrument hardware is locked via
keypad (Keys "CAL" + "DIAG"
simultaneously = security locking)
Press "MEAS" and "PARAM"
simultaneously to unlock.
Permanent, incorrect
measured value
Sensor does not immerse
completely
Check installation position
Air cushion in assembly
Check assembly and installation
position
Earth fault at or in the instrument
Test measurement in insulated vessel,
possibly with calibration solution
Plastic vessel, calibration solutions.
Behaviour, when instrument is
connected to process?
Instrument in impermissible
operating state (no response on
pressing key)
Switch instrument off and on
EMC problem: If repeated, check
grounding and wire routing
Incorrect temperature
reading
Incorrect sensor connection
Check connections using wiring
diagram
Wiring diagram s. chap. 4.1.1
Measuring cable defective
Check cable
Ohmmeter
Incorrect sensor type selected
Set sensor type on instrument (Field
141)
Check temperature sensor with
Ohmmeter.
Sensor defective
Check sensor
Measured values
fluctuate
Interference in measuring cable
Connect cable screens as per terminal
diagram
Wiring diagram s. chap. 4.1.1
Faults in signal output line
Check line installation, possibly
route line separately.
Div. controller, timer or
clean functions cannot
be activated
Relay module not available for relay
3 - 5
Install 3 relay module M3R-3
Order number and installation
s. page 95.
Controller / limit contact
does not work
Controller switched off
Activate controller s. chap. 6.4
Controller in “Manual / Off” mode
Select "Auto" or "Manual on" mode.
Keypad / PARAM / manual operation /
contacts
Pick-up delay setting too long
Switch off or shorten pick-up delay
period
"Hold" function active
"Auto hold" during calibration
"Hold" input activated
Manual "hold" active using keypad
"Hold" active during configuration
Determine cause of hold and eliminate
if not desired
"Hold" is indicated in display when
active
Controller / limit contact
work continuously
Contact in "Manual/on" mode
Set controller to "Manual/off" or "Auto".
Dropout delay setting too long
Shorted dropout delay period
Control circuit interrupted
Check measured variable, current
output or relay contacts, actuators,
chemical supply
No conductivity/mV
current output signal
Line open or short-circuited
Disconnect both (!) lines and measure
directly on instrument
mA meter 0–20 mA DC
Output defective
Replace controller module
Fixed current
output signal
Current simulation active
Switch off simulation
s. DIAG / Service / Simulation
Processor system inactive
Switch instrument off and on
EMC problem: If repeated, check
installation
"Hold" is active.
"Hold" status see display.