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One compressor per load shedding input is unloaded for single-stage compressors. One capacity stage of a
compressor per load shedding input is unloaded for capacity-controlled compressors. If a capacity-controlled
compressor should be completely unloaded via a load shedding input, the parameter
CompOFF.w.LdSh
(menu
3-1) must be set to "Y". This parameter is only displayed for capacity-controlled compressors.
Refer to the following table for the effect of the digital load shedding inputs:
Number of disabled stages
Number of activated
load shedding inputs
Parameter Verd.mLabw.AUS set to N Parameter Verd.mLabw.AUS set to Y
2 stages per compressor 3 stages per compressor
None
0
0
0
1
1
2
3
2
2
4
6
3
3
6
9
In the case of single-stage compressors, the compressor with the highest operating time is always unloaded. In
the case of capacity-controlled compressors, the compressor which is not loaded to 100% is unloaded. If all
compressors are loaded to 100%, the compressor with the highest operating time is unloaded.
Independently from the 3 load shedding signals, a minimum refrigeration capacity must be guaranteed which
requires a minimum number of enabled compressors. The minimum number of enabled compressors is
dependent on the number of compressors of a system. The following applies:
Minimum number of the enabled stages
Number of
compressors
Number of
effective
load shedding
stages
Parameter Verd.mLabw.AUS set to N Parameter Verd.mLabw.AUS set to Y
2 stages per compressor 3 stages per compressor
1
0
1
2
3
2
1
1
2
3
3
2
1
2
3
If the positive t
0
control error exceeds the limit value "
to max. diff.
" (menu 3-3) for 10 minutes, the
signals at the digital inputs for load shedding are ignored at 10 minute intervals. This guarantees the
intrinsic reliability of the refrigeration pack system (sufficient refrigeration capacity is provided).
Содержание VS 3015 C
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