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Staging and destaging order
Here the staging and destaging order of the pumps
is chosen. Staging means switching on an additional
pump in order maintain pressure. Destaging means
swithing off a pump in order to maintain pressure.
Please notice: In modes with higher capacity pumps
(200% or 300%) adding capacity doesn't necessarily
mean switching on an additional pump. Nevertheless
the term "pump" is being used no matter how the
capacity of the system will be increased or decreased.
FILO: First in, last out
If a pump is to be added, the order is as follows:
P1 > P2 > P3 > P4 > P5 > P6 > P7
This means, that the pump, which is not running and
has the lowest number, will be staged. If a pump is to
be removed, the destaging order is as follows:
P7 > P6 > P5 > P4 > P3 > P2 > P1
This means, that the pump, which is running and
has the highest number, will be destaged.
LRHIMRHO: Least-running-hours-in, most
running-hours out
The advantage of this type, is the averaging of pump
running hours. Every pump in the system, will have
a timer in the VLT to count the running hours. This
is used to select the right pump when staging and
destaging, so that all pumps are equally worn. Please
notice, that in modes 3,4 and 7,8 there is a fixed lead
pump, which will always be running at demand.
If a pump is to be staged, the order is as follows:
Among the pumps that are not running, the one
with the least running hours is staged.
If apump is to be destaged, the order is as follows:
Among the pumps that are running, the one with
highest number of running hours will be destaged.
The lead pump will not be destaged, even if it
should have the highest number.
Default value for digital input on terminal 18 (DI18)
A digital input (high) on terminal 18, will either have
(NO OPERATION) as default, which means nothing
will happen, or have (START) as default. This start
MG.70.A1.02 - VLT is a registered Danfoss trademark
VLT® 7000 Booster
command will only start the lead pump. Please refer to
Start and stop functionality for further explanation.
No. of pumps, excl. AUX pump
The minimum and maximum number of pumps that
can be controlled by the different modes.
95
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