Danfoss ADAP-KOOL Drive Programming Manual page 206

3 Parameter Description
3
25-43 Destaging Threshold
Range:
50%* [0 – 100%]
25-44 Staging Speed [RPM]
Option:
0 N/A
25-45 Staging Speed [Hz]
Option:
0 N/A
206
η
LOW
η = × 100 %
STAGE
%
η
HIGH
to 100%, where n is Motor Speed Low Limit and n
LOW
Function:
When removing a fixed speed compressor, in order to prevent an undershoot of pressure, the var-
iable speed compressor ramps up to a higher speed. When the variable speed compressor reaches
the "Destaging Speed" the fixed speed compressor is destaged. The Destaging Threshold is used
to calculate the speed of the variable speed compressor when the destaging of the fixed speed
compressor occurs. The calculation of the Destaging Threshold is the ratio of
Limit Motor Speed High Limit
, par. 4-11 or 4-12, to the
Destaging Threshold must range from
η
LOW
η % = × 100 %
STAGE
η
HIGH
to 100%, where n is Motor Speed Low Limit and n
LOW
Function:
Readout of the below calculated value for Staging Speed. When adding a fixed 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 fixed speed com-
pressor is staged on. Staging Speed calculation is based on
Motor Speed High Limit [RPM] , par. 4-13.
Staging Speed is calculated with the following formula:
η
STAGE %
η = η
STAGE HIGH
100
where n is Motor Speed High Limit and n
HIGH
Function:
Readout of the below calculated value for Staging Speed When adding a fixed 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 fixed speed com-
pressor is staged on. Staging Speed calculation is based on
Motor Speed High Limit [Hz] , par. 4-14.
MG.11.N1.02 - VLT ® is a registered Danfoss trademark
®
ADAP-KOOL Drive Programming Guide
is Motor Speed High Limit.
HIGH
Motor Speed Low
, par. 4-13 or 4-14, expressed in percent.
is Motor Speed High Limit.
HIGH
Staging Threshold
, par. 25-42, and
is the value of Staging Threshold.
STAGE100%
Staging Threshold , par. 25-42, and