M&C LA Series - Adjustment of Alarm Holding Function; Maintenance and Repair

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14.4 ADJUSTMENT OF ALARM HOLDING FUNCTION
A self-retaining of the alarm is optionally configurable. In the event of an alarm, a manual reset must
then be carried out.
The following steps must be carried out to set up the alarm hold function:
• For the LA1.1 electronic controller, remove the 4 cover screws and then the cover.
• For the rail mounting version LA1.4, loosen the locking mechanism at the top and bottom behind
the terminals using a screwdriver. Then pull the printed circuit board together with the housing
front out of the rear housing part.
• Jumper at JP1 from position 2-3 (no alarm memory function) to position 1-2 (see Figure 4 or
Figure 6).
• For the LA1.1 electronic controller, screw on the cover again.
• For the LA1.4 electronic controller, push the printed circuit board back into the housing.
To reset the electronic controller LA1.1 manually, remove the 4 cover screws, remove the cover and
then press button “S1” (see Figure 4).
To reset the electronic controller LA1.4 manually, press the button “Al. Reset” at the housing front.
15 CLOSING DOWN
No special measures need to be taken for decommissioning.
16 MAINTENANCE AND REPAIR
NOTE!
Before any maintenance and repair work, the installation-specific
and process-specific safety measures must be observed!
The LA
®
series liquid control units operate maintenance-free over a long period of time.
It is possible that the electrodes of the LA1S or LA 25S sensors are soiled with deposits. Use a cloth
for cleaning, if necessary with solvent or cleaning agent. The sensor needs to be disassembled for
cleaning.
AT T E N T I O N !
In the event of a liquid ingress, the entire conditioning system,
including the mounting assembly with sensor, must be dried and
cleaned.