Danfoss vlt aqua - Page 237

η
DESTAGE
= η
HIGH
η
DESTAGE %
100
where n
HIGH
is Motor
Speed High Limit and n
DESTAGE100%
is the value of Destaging
Threshold.
25-47 Destaging Speed [Hz]
Option: Function:
Readout of the below calculated value for Destaging Speed.
When removing a fixed speed pump, in order to prevent an un-
dershoot of pressure, the variable speed pump ramps up to a
higher speed. When the variable speed pump reaches the “De-
staging Speed” the fixed speed pump is destaged. Destaging
Speed is calculated based on
Destaging Threshold , par. 25-43,
and
Motor Speed High Limit [Hz] , par. 4-14.
Destaging Speed is calculated with the following formula:
η
DESTAGE
= η
HIGH
η
DESTAGE %
100
where n
HIGH
is Motor Speed High Limit and n
DESTAGE100%
is the
value of Destaging Threshold.
2.21.5. 25-5* Alternation Settings
Parameters for defining the conditions for alternation of the variable speed pump (lead), if selected
as part of the control strategy.
25-50 Lead Pump Alternation
Option: Function:
[0]
*
Off
[1] At Staging
VLT
®
AQUA Drive Programming Guide 2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark 237
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