Danfoss VLT Programming Manual page 174

Parameter Description
25-43 Destaging Threshold
Range:
Size related [0 - 100 %]
*
Motor speed
high limit
Destaging
speed
Fixed speed
pump
Motor speed
low limit
0 1 3
If the set-point is reached after staging before the variable
speed pump reaches its maximum speed - the system will
enter the state closed loop as soon as the feedback pressure
is crossing the set-point.
25-44 Staging Speed [RPM]
Range: Function:
0 [0 - 0 Readout of the below calculated value for Staging
RPM RPM] Speed When adding a fixed speed pump, in order
*
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, in order 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 = HIGH
Speed High Limit and n
Staging Threshold.
®
VLT HVAC Drive Programming Guide
Function:
Variable speed
pump
5 Seconds
STAGE %
100
STAGE %
where n is Motor
HIGH
100
is the value of
STAGE100%
®
MG.11.CB.02 - VLT is a registered Danfoss trademark
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, 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 "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
Motor Speed High Limit and n
value of Destaging Threshold.
25-47 Destaging Speed [Hz]
Range: Function:
0.0 [0.0 Readout of the below calculated value for Destaging
Hz - 0.0 Speed. When removing a fixed speed pump, in order
*
Hz] 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 = 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
DESTAGE %
where n is
HIGH
100
is the
DESTAGE100%
DESTAGE %
100
Variable speed
pump
Seconds
Seconds
Fixed speed
pump
Seconds
173
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