1592021021 XC1008-1011-1015D GB A5 r.1.5A 12.10.2009 XC1008-1011-1015D 43/66
7.2 Proportional band adjustment – for compressors and fans
This kind of regulation is available for compressors and fans. It is used by compressors if the
parameter C37 = Pb (C38 = Pb for circuit 2). The following observations are availables only for
adjustment without inverter. Compressors and fans work in the same way.
Example:
In this case the regulation band (CP1) is divided into as many parts as there are stages according to
the following formula:
# steps = C(i) = CPr1 or Step (number of compr. or steps).
The numbers of stages switched ON is proportional to the value of the input signal: when this
distances itself from the target set point and enters the various bands, the compressors are
switched ON, to be then turned OFF when the signal brings near the set point.
In this way if the pressure is greater than regulation band, all the compressors are on, if the
pressure (temperature) is lower than the regulation band all the compressors are off.
Naturally also for this regulations all the delays (CP11 and CP12) safety times (CP9, CP10, CP13)
are taken in account.
Regulation according to the running hours
The algorithm switch on and off the loads according to the running hours of each load. In this way
the running hours are balanced.
Example
C1 = cPr1; C2 = cPr1; C3 = cPr1; C4 = cPr1: 4 compressors
C37 = Pb proportional band regulation
C39 = yES rotation
CP16 = no “CP11” delay not enabled at first calling after a regulation zone.
CP17 = no “CP12” delay not enabled at first calling after a regulation zone.
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