25-44 Staging Speed [RPM]
Range:
Function:
0
RPM
*
[000 -
0 RPM]
Readout of the below calculated value for
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
parameter 25-42 Staging Threshold
and
parameter 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
Hz
*
[0 -
0 Hz]
Readout of the below calculated value for 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
parameter 25-42 Staging Threshold
and
parameter 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
*
[000 -
0 RPM]
Readout of the below calculated value for
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
parameter 25-43 Destaging Threshold
and
parameter 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
Hz
*
[0 -
0 Hz]
Readout of the below calculated value for
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
parameter 25-43 Destaging Threshold
and
parameter 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.
Seconds
Variable speed
pump
Motor speed
high limit
Destaging
speed
Motor speed
low limit
Fixed speed
pump
Motor speed
low limit
Destaging
speed
Motor speed
high limit
Seconds
Fixed speed
pump
Motor speed
high limit
Destaging
speed
Motor speed
low limit
Seconds
Controlled stop
command
activated
130BA368.10
Illustration 3.80 Destaging Speed
3.23.4 25-5* Alternation Settings
Parameters for defining the conditions for alternation of
the variable speed pump (lead), if selected as control
strategy.
25-50 Lead Pump Alternation
Option:
Function:
NOTICE
It is not possible to select other than
[0]
Off
if
parameter 25-05 Fixed Lead Pump
is
set to
[1] Yes
.
Lead pump alternation equalises the use of
pumps by periodically changing the pump that
is speed-controlled. This ensures that pumps
are equally used over time. Alternation
equalises the usage of pumps by always
selecting the pump with the lowest number of
used hours to stage on next.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
196
Danfoss A/S © 03/2015 All rights reserved.
MG11CE02
3
3