VISION SC600
Pag. 36
Rev. 02-18
USE AND MAINTENANCE MANUAL
OPERATING MODE
– COMPRESSORS CAPACITY MANAGEMENT
With the NPC parameter =
±
1, the operation of the compressors is selected and the digital
outputs are controlled on a side-band basis and the CAPACITY CONTROL is set to 50%.
Then there are two possible variants based on the status of the SEq variable designed for
the logical selection to activate the compressors.
-
SEq parameter = 1 (without rotation)
Based on the value of t
he “SET COMPRESSORS”, "r0C" and "nC" parameters, the
controller calculates the various areas where there is a request to enable and disable
the compressor outputs (steps) by positioning the various switch-ons and switch-offs in
the r0C differential range. Each step has a diC/nC/2 differential (where nC is the
number of compressors).
Therefore, the number of steps is twice the number of the compressors (given the
presence of the capacity control).
For instance, for compressor no.1 the enabling will occur at:
(constant 1 indicates step 1)
and the disabling will occur at:
.
The enabling of the capacity control of compressor no.1 will occur at:
and the disabling will occur at:
(without considering the intervention of times t1C and t2C).
In general, if SEq=1 the activation of the compressors and the capacity control (if one
does not consider the presence of the fans) follows this sequence: C1, PC1, C2, PC2,
C3, PC3, C4, PC4, C5, PC5, C6, PC6, C7, PC7, C8, PC8, C9, PC9, C10, PC10. The
CHAP. 5 - Data Programming
5.17
