Diagnostics and troubleshooting Liquisys M CUM223/253
82 Endress+Hauser
Current output, current
value incorrect
Adjustment not correct
Check with installed current simulation,
connect mA meter directly to current
output.
If simulation value incorrect: adjustment
in factory or new module LSCxx 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)
For safety reasons, first completely
disconnect the auxiliary power output.
Check with installed current simulation,
connect mA meter directly to current
output.
If test negative:
Renew central module LSCH/LSCP (note
variant).
No function of additional
relay
CUM253: 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 Endress+Hauser Service
Additional functions (Plus
package) missing
No or incorrect release code used
If retrofitting: check whether the correct
serial number was quoted when ordering
the Plus package.
Handled by Endress+Hauser Sales
Incorrect device serial number saved
in LSCH/LSCP module
Check whether serial number on the
nameplate matches SNR in LSCH/ LSCP
(field S 8).
The serial number of the device is
definitive for the Plus package.
Additional functions (Plus
package and/or
Chemoclean) missing
after LSCH/LSCP module
replaced
Replacement modules LSCH or LSCP
have the device serial number 0000
when they leave the factory. The
Plus package or Chemoclean are not
enabled on leaving the factory.
In the case of LSCH/LSCP with SNR
0000, a device serial number can be
entered once in fields E115 to E117.
Then enter the release code for the Plus
package and/or Chemoclean.
For a detailed description, see "Replacing
central module" section.
No HART or
PROFIBUS PA/ DP
interface function
Incorrect central module
HART: LSCH-H1 or H2 module,
PROFIBUS PA: LSCP-PA module,
PROFIBUS DP: LSCP-DP module,
see field E112.
Replace central module;
user or Endress+Hauser Service.
Wrong software SW version see field E111. SW can be modified with optoscope.
Bus problem
Remove some devices and repeat the
test.
Contact Endress+Hauser Service.
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: code received from E+H
enter.
– After replacing defective LSCH/LSCP
module: first enter instrument serial
number (s. nameplate) manually,
then enter code.
For a detailed description, see chapter
"Replacing the central module".
Error Possible cause Tests and/or remedial measures Execution, tools, spare parts
To Next Page
Loading...
