Diagnostics and troubleshooting Liquiline CM44P
142 Endress+Hauser
No. Message Factory settings Tests or remedial action
S
1)
D
2)
F
3)
906 Cat.exchanger failure F On Off Invalid values for conductivity or flow
1. Check for valid measured values in the
menu of the mathematical function.
2. Check sensors.
3. Check minimum flow.
907 Cat.exchanger warning S On Off Limit values exceeded for conductivity or flow.
Possible reasons:
• Resin depleted
• Blocked pipe
‣
Check application.
908 IEX capacity low M On Off The capacity of the exchange resin will soon be
exhausted.
‣
Schedule resin regeneration or replacement.
909 IEX capacity exhausted F On Off The capacity of the exchange resin is exhausted.
‣
Regenerate or replace the resin.
910 Limit switch S On Off Limit switch activated
937 Controlled variable S On Off Controller input warning
Status of the controller variable is not OK
‣
Check application.
938 Controller setpoint S On Off Controller input warning
Status of set point is not OK
‣
Check application.
939 Control. disturbance S On Off Controller input warning
Status of disturbance variable is not OK
‣
Check application.
951 -
958
Hold active CH1 .. C On Off Output values and status of the channels are on
hold.
‣
Wait until the hold is deactivated again.
961 -
968
Diagnostic module 1
(961)
...
Diagnostic module 8
(968)
S Off Off Diagnostic module is enabled
969 Modbus Watchdog S Off Off The device did not receive a Modbus telegram
from the master within the specified time. The
status of Modbus process values received is set to
invalid
970 Curr. input overload S On On Current input overloaded
The current input is switched off from 23 mA due
to overload and reactivated automatically when a
normal load is present.
971 Current Input low S On On Current input too low
At 4 to 20 mA, the input current is less than the
lower failure current.
‣
Check the input for short-circuiting.
972 Curr. input > 20 mA S On On Current output range exceeded
973 Current Input < 4 mA S On On Current output range undershot
974 Diagnostics confirm. C Off Off User has acknowledged the message displayed in
the measuring menu.
975 Device restart C Off Off Device reset
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