25-42 Staging Threshold
Range: Function:
90%
*
[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
Motor
Speed Low Limit
, par. 4-11 or 4-12, to the
Motor Speed High
Limit
, par. 4-13 or 4-14, expressed in percent.
Staging Threshold must range from
η
STAGE
%
=
η
LOW
η
HIGH
×100%
to 100%, where n
LOW
is Motor Speed Low Limit and n
HIGH
is
Motor Speed High Limit.
25-43 Destaging Threshold
Range: Function:
50%
*
[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
, par. 4-11 or 4-12, to the
Motor Speed
High Limit
, par. 4-13 or 4-14, expressed in percent.
Destaging Threshold must range from
η
STAGE
%
=
η
LOW
η
HIGH
×100%
to 100%, where n
LOW
is
Motor Speed Low Limit and n
HIGH
is Motor Speed High Limit.
VLT
®
AQUA Drive Programming Guide 2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
235
2
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