VISION SC600
Pag. 26
Rev. 02-18
USE AND MAINTENANCE MANUAL
OPERATING MODE
– INVERTER MANAGEMENT
The operating mode is selected via the iEn parameter.
iEn = 0: inverter management deactivated
If iEn = 0 both the fans and the compressors are managed with digital outputs and side-
band control.
-
For the compressors:
Based on the value of the “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 r0C/nC differential (where nC is the number of
compressors). The combination of the outputs to the steps depends on the setting of the
Seq. variable. If, for instance, we consider Seq=1, for Compressor output no.2 the
enabling will occur at SE(r0C/nC)*2 (constant 2 refers to step 2) and the
disablings will occur at SET(r0C/nC)*1 (see graph no.1 or graph no.2 ).
The number of enabled compressors depends on the deviation between the value
measured by the adjustment pressure sensor (located at the intake) and the set intake Set
point.
-
For the fans:
Based on the value of the “SET FANS”, ''r0U'' and ''nU'' parameters, the controller
calculates the various areas where there is a request to enable and disable the fan outputs
(steps) by positioning the various switch-ons and switch-offs in the r0U differential range.
Each step has a r0U/nU differential (where nU is the number of fans). The combination of
the outputs to the steps depends on the setting of the Seq. variable.
If, for instance, we consider Seq=1, for Fan output no.2 the enabling will occur at
S(r0U/nU)*2 (constant 2 refers to step 2) and the disabling will occur at
SE(r0U/nU)*1 (see graph n0.3).
The number of fans enabled depends on the deviation between the value measured by the
adjustment pressure sensor (on the supply line) and the set supply Set point.
5.16
CHAP. 5
– Data Programming
