Danfoss VLT AQUA Drive FC 200 Programming Manual page 172

Parameter Description
25-44 Staging Speed [RPM]
Range: Function:
0 [0 - 0 Readout of the below calculated value for
RPM RPM] Staging Speed. When adding a fixed speed
*
pump, to prevent an overshoot of pressure, the
variable speed pump ramps down to a lower
speed. When the variable speed pump reaches
the "Staging Speed" the fixed speed pump is
staged on. Staging Speed calculation is based
on 25-42 Staging Threshold, and 4-13 Motor
Speed High Limit [RPM].
Staging Speed is calculated with the following
formula:
STAGE = HIGH
where n is Motor Speed High Limit and
HIGH
n is the value of Staging Threshold.
STAGE100%
25-45 Staging Speed [Hz]
Range: Function:
0.0 [0.0 - Readout of the below calculated value for Staging
Hz 0.0 Speed When adding a fixed speed pump, to
*
Hz] prevent an overshoot of pressure, the variable
speed pump ramps down to a lower speed. When
the variable speed pump reaches the "Staging
Speed" the fixed speed pump is staged on.
Staging Speed calculation is based on
25-42 Staging Threshold, and 4-14 Motor Speed High
Limit [Hz].
Staging Speed is calculated with the following
formula:
STAGE %
STAGE = HIGH
100
High Limit and n
Threshold.
25-46 Destaging Speed [RPM]
Range: Function:
0 [0 - 0 Readout of the below calculated value for
RPM RPM] Destaging 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 "Destaging Speed" the fixed speed pump is
destaged. Destaging Speed is calculated based
on 25-43 Destaging Threshold, and 4-13 Motor
Speed High Limit [RPM].
Destaging Speed is calculated with the
following formula:
DESTAGE = HIGH
Speed High Limit and n
of Destaging Threshold.
®
VLT AQUA Drive Programming Guide
STAGE %
100
where n is Motor Speed
HIGH
is the value of Staging
STAGE100%
DESTAGE %
where n is Motor
HIGH
100
is the value
DESTAGE100%
®
MG20O602 - VLT is a registered Danfoss trademark
25-47 Destaging Speed [Hz]
Range: Function:
0.0 [0.0 Readout of the below calculated value for
Hz - 0.0 Destaging Speed. When removing a fixed speed
*
Hz] pump, to prevent an undershoot of pressure, the
variable speed pump ramps up to a higher speed.
When the variable speed pump reaches the
"Destaging Speed" the fixed speed pump is
destaged. Destaging Speed is calculated based on
25-43 Destaging Threshold, and 4-14 Motor Speed
High Limit [Hz].
Destaging Speed is calculated with the following
formula:
DESTAGE %
DESTAGE = HIGH
where n is Motor Speed High Limit and
HIGH
n is the value of Destaging Threshold.
DESTAGE100%
Motor speed
high limit
Destaging
speed
Motor speed
low limit
Controlled stop
command
activated
Motor speed
high limit
Fixed speed
pump
Destaging
speed
Motor speed
low limit
Motor speed
high limit
Destaging
speed
Motor speed
low limit
Illustration 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.
100
Variable speed
pump
Seconds
Seconds
Fixed speed
pump
Seconds
171
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