Grundfos Control MPC Montage- Und Betriebsanleitung Seite 64

8.6.56 Monitoring functions (4.4)
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)
• Pressure relief (4.4.8)
• Log values (4.4.9)
• Fault, feedback sensor (4.4.10).
Setting via the operating panel
• Settings > Monitoring functions.
Related information
8.6.57 Dry-running protection (4.4.1)
8.6.61 Min. pressure (4.4.2)
8.6.62 Max. pressure (4.4.3)
8.6.63 External fault (4.4.4)
8.6.64 Limit 1 exceeded (4.4.5 - 4.4.6)
8.6.65 Pumps outside duty range (4.4.7)
8.6.66 Pressure relief (4.4.8)
8.6.67 Log values (4.4.9)
8.6.68 Fault, feedback sensor (4.4.10)
64
8.6.57 Dry-running protection (4.4.1)
Dry-running protection
Description
Dry-running protection is one of the most important monitoring
functions, as the bearings and the shaft seal may be damaged
if the pumps run dry. We thus always recommend that you use
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 Pressure/level switch (4.4.1.1).
• Measurement of inlet pressure in the inlet manifold by means of
an analog pressure transmitter. See section Measurement, inlet
pressure (4.4.1.2).
• Measurement of level in the supply tank by means of an analog
level transmitter. See section Measurement, tank level (4.4.1.3).
Setting via the operating panel
• Settings > Monitoring functions > Dry-running protection >
Select method.
Related information
8.6.58 Pressure/level switch (4.4.1.1)
8.6.59 Measurement, inlet pressure (4.4.1.2)
8.6.60 Measurement, tank level (4.4.1.3)