Emerson VISSION 20/20 ユーザーズマニュアル
23
BOARD
I/O #
DESCRIPTION
TYPE
#
10
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.
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.
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.
ing.
Analog Outputs