25-43 Destaging Threshold
Range: Function:
50%* [0 –
100%]
When removing a xed speed compressor, in
order to prevent an undershoot of pressure, the
variable speed compressor ramps up to a higher
speed. When the variable speed compressor
reaches the “Destaging Speed” the xed speed
compressor is destaged. The Destaging
Threshold is used to calculate the speed of the
variable speed compressor when the destaging
of the xed speed compressor occurs. The
calculation of the Destaging Threshold is the
ratio of parameter 4-11 Motor Speed Low Limit
[RPM] or parameter 4-12 Motor Speed Low Limit
[Hz] to parameter 4-13 Motor Speed High Limit
[RPM] or parameter 4-14 Motor Speed High Limit
[Hz] expressed in percent.
Destaging Threshold must range from
η
STAGE %
=
η
LOW
η
HIGH
× 100 %
to 100%, where n
LOW
is Motor Speed Low Limit
and n
HIGH
is Motor Speed High Limit.
Figure 6.34 Destaging Threshold
25-44 Staging Speed [RPM]
Option: Function:
0 N/A Readout of the below calculated value for Staging
Speed. When adding a xed speed compressor, in
order to prevent an overshoot of pressure, the
variable speed compressor ramps down to a lower
speed. When the variable speed compressor reaches
the “Staging Speed” the xed speed compressor 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:
η
STAGE
= η
HIGH
η
STAGE %
100
where n
HIGH
is Motor Speed High Limit and n
STAGE100%
is the value of Staging Threshold.
25-45 Staging Speed [Hz]
Option: Function:
0 N/A Readout of the below calculated value for Staging
Speed When adding a xed speed compressor, in
order to prevent an overshoot of pressure, the
variable speed compressor ramps down to a lower
25-45 Staging Speed [Hz]
Option: Function:
speed. When the variable speed compressor reaches
the “Staging Speed” the xed speed compressor 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:
η
STAGE
= η
HIGH
η
STAGE %
100
where n
HIGH
is Motor Speed High
Limit and n
STAGE100%
is the value of Staging Threshold.
25-46 Destaging Speed [RPM]
Option: Function:
0 N/A Readout of the below calculated value for Destaging
Speed. When removing a xed speed compressor, in
order to prevent an undershoot of pressure, the
variable speed compressor ramps up to a higher
speed. When the variable speed compressor reaches
the “Destaging Speed” the xed speed compressor is
destaged. Destaging Speed is calculated based on
parameter 25-43 De-staging Threshold and
parameter 4-13 Motor Speed High Limit [RPM].
Destaging Speed is calculated with the following
formula:
η
DESTAGE
= η
HIGH
η
DESTAGE %
100
where n
HIGH
is Motor Speed High
Limit and n
DESTAGE100%
is the value of Destaging
Threshold.
25-47 Destaging Speed [Hz]
Option: Function:
Readout of the below calculated value for Destaging
Speed. When removing a xed speed compressor, in
order to prevent an undershoot of pressure, the
variable speed compressor ramps up to a higher speed.
When the variable speed compressor reaches the
“Destaging Speed” the xed speed compressor is
destaged. Destaging Speed is calculated based on
parameter 25-43 De-staging Threshold and
parameter 4-14 Motor Speed High Limit [Hz]
Destaging Speed is calculated with the following
formula:
η
DESTAGE
= η
HIGH
η
DESTAGE %
100
where n
HIGH
is Motor Speed High Limit and n
DESTAGE100%
is the value of Destaging Threshold.
Parameter Descriptions Operating Instructions
MG34M422 Danfoss A/S © Rev. 2013-07-03 All rights reserved. 117
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