Operating instructions

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
RPM
*
[0 - 0
RPM]
Readout of the below calculated value for Staging
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
par. 25-42 Staging Threshold, and par. 4-13 Motor
Speed High Limit [RPM].
Staging Speed is calculated with the following
formula:
STAGE = HIGH
STAGE %
100
where n
HIGH
is Motor Speed High Limit and
n
STAGE100%
is the value of Staging Threshold.
25-45 Staging Speed [Hz]
Range: Function:
0.0
Hz
*
[0.0
- 0.0
Hz]
Readout of the below calculated value for Staging
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 par. 25-42 Staging Threshold,
and par. 4-14 Motor Speed High Limit [Hz].
Staging Speed is calculated with the following
formula:
STAGE = HIGH
STAGE %
100
where n
HIGH
is Motor
Speed High Limit and n
STAGE100%
is the value of
Staging Threshold.
25-46 Destaging Speed [RPM]
Range: Function:
0
RPM
*
[0 - 0
RPM]
Readout of the below calculated value for Destag-
ing 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 destag-
ed. Destaging Speed is calculated based on
par. 25-43 Destaging Threshold, and par. 4-13 Motor
Speed High Limit [RPM].
Destaging Speed is calculated with the following
formula:
DESTAGE = HIGH
DESTAGE %
100
where n
HIGH
is
Motor Speed High Limit and n
DESTAGE100%
is the
value of Destaging Threshold.
25-47 Destaging Speed [Hz]
Range: Function:
0.0
Hz
*
[0.0
- 0.0
Hz]
Readout of the below calculated value for 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 par. 25-43 Destaging Threshold,
and par. 4-14 Motor Speed High Limit [Hz].
Destaging Speed is calculated with the following
formula:
DESTAGE = HIGH
DESTAGE %
100
where n
HIGH
is Motor Speed High Limit and
n
DESTAGE100%
is the value of Destaging Threshold.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CA.02 - VLT
®
is a registered Danfoss trademark 173
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