D145H4502 Ed. 01
10
Compressors control
Proportional mode
WITHOUT FREQUENCY CONVERTER
The controller activates (red line) or deactivates (green line) the different stages/compressors available in a linear
manner depending on the reading obtained in probe 1 until the Set Point (E01) is reached again, as shown in the
following figure
n: Number of stages/compressors available
WITH FREQUENCY CONVERTER
If there is a frequency converter, the frequency converter modulates the power of compressor 1 between 0 and
100% (blue zone). If demand increases, the following compressor or stage (without converter) is added, again mo-
dulating the power of compressor 1 using the converter, and so on.
This method allows modulating the total power available using just one frequency converter.
n: Number of stages/compressors available
In both cases, the delays t01 to t04 must be accounted for.
E01 E01
E06
n
E06
n
Direct
operation (C7=0)
Inverse
operation (C7=1)
stage / compressor 4 ON
stage / compressor 3 ON
stage / compressor 2 ON
stage / compressor 1 ON
Bandwidth (E06)Bandwidth (E06)
Pressure in Probe 1
Stages /
Compressors
Pressure in Probe 1
Total power
applied
E01 E01
100%
0%
100%
0%
100%
0%
100%
0%
100%
0%
100%
0%
100%
0%
100%
0%
E06
n
E06
n
R2 R2R2 R2
R3
R3
R2 R2
R3 R3
R4 R4
Direct
operation (C7=0)
Inverse
operation (C7=1)
Bandwidth (E06)Bandwidth (E06)
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