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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
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.
Water pressure Hx filtered
Dyn Drucküberw Überw´zeit
7471d61e/1210
Valid pressure range
after pump on
(e.g. 0.4 bar)
Time
T0 T1 T2
Pump off Pump on Pump off
Figure 46: Dynamic water pressure supervision with LMS14...
Key
Line no. Meaning
8327 Water pressure
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