IM-P693-07
EMM Issue 2
17
LCS3051 High Water Level Switch
6.2 Action against high frequency interference
Should sporadic failures occur in installations susceptible to faults (e. g. malfunctions due to out-of-phase
switching operations) we recommend the following actions in order to suppress interferences:
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Provide inductive loads with RC combinations according to manufacturer's specification to ensure
interference suppression.
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Make sure that connecting cables leading to the level probes are segregated and run separately from
power cables
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Increase the distance to sources of interference.
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Check the connection of the screen to the central earthing point (CEP) in the control cabinet.
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HF interference suppression by means of hinged-shell ferrite rings.
6.3 Interlock and interlock deactivation
In the event of an alarm the level switch LCS3051 does not interlock automatically.
If a lockout function is required by the installation it must be provided in the follow-up circuitry (safety circuit).
The circuitry must meet the requirements of the EN 50156.
6.4 Checking the switchpoints
To check the switchpoint “High water level (HW) exceeded” you have to fill the boiler until the max. water level
is reached. As soon as the high level is reached the level switch must trigger an alarm and open the safety
circuit after the de-energizing delay has elapsed The deactivation of the heating is interlocked in the safety
circuit and the lockout can only be reset when the level probe is exposed again. Always check the switchpoint
when commissioning the equipment, after replacing the level probe and at regular intervals, e. g. every year.
6.5 Decommissioning/replacing level switch
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Switch off supply voltage and cut off power supply to the equipment.
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Unscrew the right and left fixing screws 3 and remove the upper and lower terminal strips 1, 2, Fig. 2
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Undo the fixing slide in order to snap out the level switch and take it off the supporting rail.
6.6 Disposal
Remove the level switch and separate the waste materials in accordance with the material specification.
Electronic component parts such as the circuit board must be disposed of separately!
For the disposal of the level switch observe the pertinent legal regulations concerning waste disposal.
