VISION SC600
Pag. 25
Rev. 02-18
USE AND MAINTENANCE MANUAL
INPUTS AND OUTPUTS CONFIGURATION
The configuration of the outputs of the 100N MASTER unit can be set via the nC, nU and
NPC parameters. Each output can be associated with the relative protection via the I1, I2,
… , I15 digital inputs.
The nC, nU and NPC parameters are closely associated with each other
.
The maximum
number of compressors depends on the number of fans set and if there is any capacity
control. The sum of the fans + compressors must not be greater than 10 if there is no
capacity control (NPC=0). If the capacity control is activated (NPC=1 or -1), each
compressor is associated with an additional output to check the relative splitting valve.
Therefore, the sum of twice the compressors plus the fans must be less than or equal to
10 (maximum number of outputs). Recap:
Maximum number of
compressors
Maximum number of
Fans
Active capacity control
(NPC=1 or -1)
5
– [(number of fans nU)/2]
10
– (number of compressors nC*2)
Disabled capacity control
(NPC=0)
10
– (number of fans nU)
10
– (number of compressors nC)
Compressors and fans have a sliding-based management: the first outputs are considered
as “Compressor outputs”, followed by the “Capacity control outputs” and finally the “Fan
outputs”. If, for instance, you set NPC=1, nC=3, nU=3 then:
- digital output
s 0, 1, 2 are “Compressor outputs”;
- outputs 3, 4, 5 are associated with the capacity control of the compressors;
- outputs 6, 7, 8 are the digital outputs that control the fans.
If a compressor is eliminated, i.e. changed from nC=3 to nC=2, then:
- outputs 0, 1 = compressor outputs;
- outputs 2, 3 = capacity outputs;
- outputs 4, 5, 6 = fan outputs.
5.15
CHAP. 5
– Data Programming
