Danfoss VLT AQUA Programming Manual page 237

®
VLT AQUA Drive Programming Guide
25-47 Destaging Speed [Hz]
Option:
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:
*
[0]
[1]
η
DESTAGE
Speed High Limit and n
Threshold.
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
Motor Speed High Limit [Hz]
and
Destaging Speed is calculated with the following formula:
η
DESTAGE
where n
value of Destaging Threshold.
Function:
Off
At Staging
®
MG.20.O2.02 - VLT is a registered Danfoss trademark
η
DESTAGE
%
= η
HIGH
100
DESTAGE100%
Destaging Threshold
, par. 4-14.
η
DESTAGE
%
= η
HIGH
100
is Motor Speed High Limit and n
HIGH
2. Parameter Description
where n is Motor
HIGH
is the value of Destaging
, par. 25-43,
is the
DESTAGE100%
2
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