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Key
Building Technologies Division
1. Checking the minimum pressure change:
During this period of time, the measured values of the differential pressure ∆P are
summed up at 200 ms intervals. At the end of the measuring time Dyn press superv
time (2495), the measured values summed up are compared with limit value Dyn
superv press diff min (2491), which means that the parameterization of Dyn superv diff
press min (2491) must be matched to the parameterization of Dyn press superv time
(2495). This approach enables the measured pressure increase to be amplified and
filtered.
2. Checking the maximum permissible pressure change:
During the measuring time Dyn press superv time (2495), the current measured value
of the differential pressure ∆P is compared with limit value Dyn superv diff press max
(2492) at 200-ms intervals and, if necessary, the LMS14... responds to the fault.
Caution!
If Dyn press superv time (2495) and Dyn superv diff press min (2491) are not
correctly parameterized, electromagnetic interference might adversely affect
the acquired pressure, erroneously indicating a correctly working pump.
Note!
The acquired differential pressure values are always absolute values.
Pump off
T0
Figure 46: Dynamic water pressure supervision with LMS14...
Line no.
Meaning
8327
User Manual LMS14...
6 The settings in detail
Valid pressure range
after pump on
(e.g. 0.4 bar)
Dyn Drucküberw Überw´zeit
Pump on
T1
Water pressure
Pump off
T2
Time
239/617
CC1U7471en
07.05.2014
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