VISION SC600
Pag. 31
Rev. 02-18
USE AND MAINTENANCE MANUAL
iEn = 1: compressor inverter management activated
If iEn=1, compressor 1 is managed with the 0-10V output and a side-band control. The
compressor 1 digital output is used to enable the inverter, the other digital outputs control
the remaining compressors with a side-band control.
The adjustment of the inverter is based on the operation shown in Graph no.4 as the
intake pressure varies:
-
When the first compressor step is activated, the inverter output is set to the minimum iMc
value.
-
Afterwards, the inverter output varies in proportion with the value read by the intake
sensor (within a 0-10V range) and the other compressor outputs are controlled on a
side-band basis;
-
When there is a request to enable the second compressor stage and after the t1C time,
the inverter output is gradually reduced down to the iMc value. Compressor output 2 is
then activated and the inverter varies in proportion with the value read by the intake
sensor;
-
When a compressor step is disabled, the inverter output is gradually increased until it
reaches the maximum value in the itS time. It then varies in proportion with the value
read by the intake sensor.
CONTROL IN THE EVENT OF ALARMS
With the compressor output no.1 alarm input activated, the analogue input will be
immediately brought to 0V and the digital output no.1 will be opened after (inverter-
enabling is removed).
The relative alarm (EC1) will also be shown on the display.
CHAP. 5 - Data Programming
