dixell XC660D - Regulation with Screw Compressors like Bitzer; Hanbell; Refcomp etc; Fan Regulation

1592001850 XC660D GB r3.4 04.09.2017.docx XC660D 36/55
The activation of the valve is designed according to the Bitzer, Hanbell compressors.
Set the relay oA1 = CPr1, it will manage the compressor.
Set the oA2, oA3 and oA4 as “StP”.
20.1 Regulation with screw compressors like Bitzer/ Hanbell/
Refcomp etc
Screw compressors like Bitzer use up to 3 valves for the power regulation.
20.1.1 Relay activation
ES. Compressor with 4 steps:
oA1 = CPr1; oA2 = StP; oA3 = StP; oA4 = StP; CtyP = Scr
a. Activation with valves ON due to voltage presence (StP=cL).
oA1 = Screw1
oA2 = StP
oA3 = StP
oA4 = StP
Step 1 (25%)
ON
ON
OFF
OFF
Step 2 (50%)
ON
OFF
ON
OFF
Step 3 (75%)
ON
OFF
OFF
ON
Step 4 (100%)
ON
OFF
OFF
OFF
b. Activation with valves ON due to voltage absence (StP=oP).
C1 = Screw1
C2 = stp
C3 = stp
C4 = stp
Step 1 (25%)
ON
OFF
ON
ON
Step 2 (50%)
ON
ON
OFF
ON
Step 3 (75%)
ON
ON
ON
OFF
Step 4 (100%)
ON
ON
ON
ON
21. Fan regulation
The fan regulation band Pb is divided by the number of fans:
The numbers of fans 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 fans 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 fans are on, if the pressure
(temperature) is lower than the regulation band all the fans are off.
Naturally also for this regulations all the delays (Fon and FoF) are valid.
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
4 Fans: oA2 =FAn; oA3 = FAn; oA4 = FAn; oA6 = FAn:
rot = yES rotation enabled