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8.7.48 Monitoring functions (4.4)
Fig. 102 Monitoring functions
Description
The system has a series of functions that constantly monitor the
operation of the system.
The primary purpose of the monitoring functions is to ensure that
faults do not damage pumps or the system.
Setting range
•
Dry-running protection (4.4.1)
•
Min. pressure (4.4.2)
•
Max. pressure (4.4.3)
•
External fault (4.4.4)
•
Limit 1 exceeded (4.4.5 - 4.4.6)
•
Pumps outside duty range (4.4.7)
•
Log values (4.4.9)
•
Fault, primary sensor (4.4.10)
•
Night flow monitoring
(4.4.11).
Setting via operating panel
•
Settings > Monitoring functions.
8.7.49 Dry-running protection (4.4.1)
Fig. 103 Dry-running protection
Description
Dry-running protection is one of the most important monitoring
functions, as bearings and shaft seal may be damaged if the
pumps run dry. We thus always recommend dry-running
protection.
The function is based on monitoring of the inlet pressure or the
level in a possible tank or pit on the inlet side.
Level switches, pressure switches or analog sensors signalling
water shortage at a set level can be used.
There are three different methods for detection of water shortage:
•
Pressure switch on inlet manifold or float switch/electrode
relay in the supply tank. See section
switch
(4.4.1.1).
•
Measurement of inlet pressure in the inlet manifold by means
of an analog pressure transmitter. See section
8.7.51 Measurement, inlet pressure
•
Measurement of level in the supply tank by means of an
analog level transmitter. See section
tank level
(4.4.1.3).
Setting via operating panel
•
Settings > Monitoring functions > Dry-running protection >
Select method.
8.7.50 Pressure/level
(4.4.1.2).
8.7.52 Measurement,
51
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