ADV200 WA • Functions description and parameters list
179
Staging & Destaging the pumps
At system start, the pump that has accumulated the fewest work hours always starts first, following the required pres-
sure/flow reference and rotating at Vref speed. If the active pump is insufficient to ensure the required reference, a
second pump is started (always based on accumulated work hours), followed by others if needed. The Staging phase
is activated by the controller’s
Start/Stop digital output
. The controller activates only the available follower pumps
(i.e., not broken or in maintenance). The controller monitors pump status via the
Available / Not Available
digital out-
put and activates only the available ones.
Likewise, if lower pressure/flow is required, pumps have to be switched off (Destaging phase). You can use parameter
11412
Sort Down
to select whether destaging will follow the criterion of work hours accumulated by each pump (the
one with the most work hours will be switched off first), or will start from the last one staged (LIFO sequence). The
pumps are destaged via the controller’s Start/Stop digital output.
Subsequent pumps are staged/destaged by considering a speed threshold value configurable via parameters 11402
/11404 and a staging/destaging delay configurable via parameters 11406/11408. Therefore, the pump is staged when
the already active pump has reached the threshold speed for a set time. Likewise for destaging, the pump is switched
off if the pump has reached a Stop threshold speed for a set time. This is done to avoid continuous starts & stops,
which would be inefficient.
An additional parameter 11410
Hold Time
lets you control the staging of added pumps and avoids instability. This
parameter gives the added pump the time needed to reach full running speed, so that in this interval the controller (not
seeing the effect of pump 2) will not uselessly stage another one.
Speed
Time
Pump 1
Pump 2
V ref
11402
Stage Threshold
11406
Start Delay
11410
Hold Time
The controller activates only the available pumps (i.e., not broken or in maintenance). It receives this information from
the
Pump Available / NOT Available digital output.
Note:
staging is disabled if “All same Speed” control mode is used.
Maintenance of pumps
All pumps can be put into maintenance and thus excluded from the group. A pump is put into maintenance by activat-
ing the “
Pump Maintenance
” digital input.
The pump commanded by the controller drive can be put into maintenance as long as the control card is powered
by an ex
24V supply.
In this way, the controller card remains active even if the power part of the inverter (and
therefore the pump) is switched off.
The pump can be put into maintenance via parameter 11354 and the “
Pump Maintenance
” source digital input can be
selected via parameter 11356.
Pump work time
The control algorithm can stage/destage the pumps and keep the work hours of each pump almost equal.
You can initialize and reset the pump’s work hour counter by selecting the specific pump via parameters 11362, 11364,
11366.
You can read the timer value via read-only parameters 12042 – 12056.
Содержание ADV200 WA
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Страница 274: ...274 ADV200 WA Block Diagrams G Block Diagrams System Diagrams Index Drive overview ...
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