Emerson VISSION 20/20 Manuel D’Utilisation

23

BOARD

   I/O # 

DESCRIPTION   

 

 

 

 

TYPE

#
10 

1 

Compressor VFD 

 

 

 

 

4-20 mA

10 

2 

Condenser VFD   

 

 

 

 

4-20 mA

10 

3 

% Slide Valve Position 

 

 

 

 

4-20 mA

10 

4 

Motorized Valve

 (Cool Compression or Liquid Injection), V+

 

4-20 mA

10 

5 

Profile Cooler VFD (Profile only)   

 

 

4-20 mA

10 

6 

 

10 

7 

 

10 

8 

 

COMPRESSOR VFD – 4-20mA output to control compressor motor speed with a Variable Frequency Drive (VFD). 

CONDENSER VFD – 4-20mA output to control one condenser fan which is interleaved between the remaining 
condenser steps for smoother control.

% SLIDE VALVE POSITION – 4-20mA signal that transmits the slide valve position for remote monitoring.

MOTORIZED VALVE (V+) – for a cool compression compressor, this 4-20ma signal controls a motorized valve to 
regulate the liquid refrigerant level in the oil separator.  For a liquid injection application on a standard single 
screw, this 4-20ma signal controls a motorized valve to regulate the liquid refrigerant injected into the compres-
sor for oil cooling purposes.

PROFILE VFD – for a profile unit compressor, this signal controls the aftercooler fan speed which provides oil cool-
ing.