Danfoss VLT AQUA Programming Manual page 235

®
VLT AQUA Drive Programming Guide
25-42 Staging Threshold
Range:
*
90%
25-43 Destaging Threshold
Range:
*
50%
Function:
[0 – 100%] When adding a fixed speed pump, in order to prevent an over-
shoot of pressure, the variable speed pump ramps down to a
lower speed. When the variable speed pump reaches the "Stag-
ing Speed" the fixed speed pump is staged on. The Staging
Threshold is used to calculate the speed of the variable speed
pump when the "cut-in point" of the fixed speed pump occurs.
The calculation of the Staging Threshold is the ratio of
Speed Low Limit
Limit , par. 4-13 or 4-14, expressed in percent.
Staging
η
STAGE
to 100%, where n
Motor Speed High Limit.
Function:
[0 – 100%] 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. The Destag-
ing Threshold is used to calculate the speed of the variable
speed pump when the destaging of the fixed speed pump oc-
curs. The calculation of the Destaging Threshold is the ratio of
Motor Speed Low Limit
High Limit
Destaging
η
STAGE
Motor Speed Low Limit and n
®
MG.20.O2.02 - VLT is a registered Danfoss trademark
, par. 4-11 or 4-12, to the
Threshold must
η
LOW
= × 100 %
%
η
HIGH
is Motor Speed Low Limit and n
LOW
, par. 4-11 or 4-12, to the
, par. 4-13 or 4-14, expressed in percent.
Threshold must
η
LOW
= × 100 %
%
η
HIGH
is Motor Speed High Limit.
HIGH
2. Parameter Description
Motor
Motor Speed High
range from
is
HIGH
Motor Speed
range from
to 100%, where n is
LOW
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