Danfoss VLT FC 100 Series Programming Manual page 195

Parameter Description
25-46 De-staging Speed [RPM]
Range:
0 [0 - 0
3 3
RPM RPM]
*
25-47 De-staging Speed [Hz]
Range:
0.0 [0.0
Hz - 0.0
*
Hz]
3-168
Function:
Readout of the value calculated below for De-
staging Speed. When removing a fixed-speed
pump, in order to prevent an undershoot 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 de-staged. De-staging Speed is
calculated based on 25-43 De-staging Threshold,
and 4-13 Motor Speed High Limit [RPM].
De-staging Speed is calculated with the
following formula:
DESTAGE %
where n
DESTAGE = HIGH
100
Speed High Limit and n
DESTAGE100%
of De-staging Threshold.
Function:
Readout of the value calculated below for De-
staging Speed. When removing a fixed-speed
pump, in order to prevent an undershoot 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 de-staged. De-staging Speed is calculated
based on 25-43 De-staging Threshold, and
4-14 Motor Speed High Limit [Hz].
De-staging Speed is calculated with the following
formula:
DESTAGE %
DESTAGE = HIGH
100
where n is Motor Speed High Limit and
HIGH
n is the value of De-staging Threshold.
DESTAGE100%
MG11CD22 - VLT
®
VLT HVAC Drive Programming Guide
is Motor
HIGH
is the value
Figure 3.79
3.23.4 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.
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