Danfoss VLT AQUA Drive FC 200 Programming Manual page 180

Parameter Description
25-46 De-staging Speed [RPM]
Range:
0 [000 -
3 3
RPM 0 RPM]
*
25-47 De-staging Speed [Hz]
Range:
0 [0 -
Hz 0 Hz]
*
3-154
Function:
Readout of the value calculated below for De-
staging Speed. When removing a fixed-speed
pump, 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, 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%
MG20O622 - VLT
®
VLT AQUA Drive Programming Guide
is Motor
HIGH
is the value
Figure 3.78
3.22.4 25-5* Alternation Settings
Parameters for defining the conditions for alternation of
the variable-speed pump (lead) if selected as of the control
strategy.
25-50 Lead Pump Alternation
Option: Function:
[0] OFF No alternation of lead pump function will take place. It
NOTICE!
It is not possible to select other than [0] Off if 25-05 Fixed
Lead Pump is set to [1] Yes.
®
is a registered Danfoss trademark
Lead pump alternation equalizes the use of pumps by
periodically changing the pump that is speed
controlled. This ensures that pumps are equally used
over time. Alternation equalizes the usage of pumps by
always choosing the pump with the lowest number of
used hours to stage on next.
is not possible to set this parameter to options other
that [0] Off if 25-02 Motor Start is set other than [0]
Direct on Line.