Endress+Hauser Liquisys M CCM223, Operating Instructions Manual

Page: 81 / 124

Liquisys M CCM223/253 Diagnostics and troubleshooting
Hauser 81
Measured values
fluctuate
Interference in measuring cable Connect cable screen as per connection
diagram. Connection diagrams
Interference in signal output line Check line installation, possible route
line separately. Route signal output and measuring input
lines separately
Interference potential in medium Eliminate interfering potential.
No potential matching on
symmetrical input Connect PM pin in assembly to
instrument terminal PA/PM.
Controller or timer cannot
be activated
No relay module installed Install LSR1-2 or LSR1-4 module.
Controller / limit contact
do not work
Controller switched off Activate controller. See fields R2xx.
Controller in "Manual/Off" mode Choose "Auto" or "Manual/On" mode. Keyboard, REL-key
Pickup delay setting too long Disable or shorten pickup delay. See fields R2xx
"Hold" function active “Automatic Hold” during calibration,
“Hold” input activated;
“Hold” via keyboard active.
See fields S2 to S4
Controller/limit contact
works continuously
Controller in "Manual/On" mode Set controller to "Manual/Off" or "Auto". Keyboard, REL and AUTO keys
Dropout delay setting too long Shorten dropout delay. See field R2xx
Control loop interruption Check measured value, current output,
actuators, chemical supply.
No current output signal
Line open or short-circuited Disconnect line and measure directly on
instrument. mA meter 0–20 mA
Output defective See chapter "Instrument specific error.
Fixed current output
signal
Current simulation active Switch off simulation. See field O3
Impermissible operating state of
processor system
Switch instrument off and back on. EMC problem: check installation, screen,
grounding if problem persists
Incorrect current output
signal
Incorrect current assignment Check current assignment: 0–20 mA or
4–20 mA? Field O311
Total load in current loop excessive
(> 500
 )
Disconnect output and measure directly
on instrument. mA meter for 0–20 mA DC
Current output table not
accepted
Value interval too small Select practical intervals.
No temperature output
signal
Instrument does not have 2nd
current output Refer to nameplate for variant; change
LSCH-x1 module if necessary. Module LSCH-x2,
see chapter "Spare parts".
Instrument with PROFIBUS PA PA instrument has no current output!
Chemoclean function not
available
No relay module (LSR1-x) installed
or only LSR1-2 available
Additional function not enabled
Install LSR1-4 module.
Chemoclean is enabled using the release
code supplied by E+H in the Chemoclean
retrofit kit.
Module LSR1-4,
see chapter "Spare parts".
Plus package functions
not available
Plus package not enabled (enable
with code that depends on serial
number and is received from E+H
with order of extension package)
– When upgrading instrument with
Plus package: enter code received
from E+H.
– After replacing defective LSCH/LSCP
module: first enter instrument serial
number (s. nameplate) manually,
then enter code.
For a detailed description, see chapter
"Replacement of central module".
Error Possible cause Tests and / or remedial measures Equipment, spare parts, personnel