Service manual

3 – 6
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
range and calibration is set in the calibration screen.
Discharge Pressure
• Default signal is 4-20mA. Discharge pressure trans-
ducer range and calibration is set in the calibration
screen.
Oil Filter Inlet Pressure:
• Default signal is 4-20mA. Oil fi lter pressure trans-
ducer range and calibration is set in the calibration
screen.
Oil Manifold Pressure:
• Default signal is 4-20mA. Oil manifold pressure trans-
ducer range and calibration is set in the calibration
screen.
Economizer Pressure:
• Default signal is 4-20mA. Economizer pressure trans-
ducer range and calibration is set in the calibration
screen.
Slide Valve Position:
• Reads the 0-5 volt signal back from the slide posi-
tion motor actuator to indicate current slide valve
position.
Volume Position:
• Reads the 0-5 volt signal back from the slide volume
motor actuator to indicate current volume position.
Suction Temperature:
• Default signal is RTD. Suction temperature calibra-
tion is set in the calibration screen.
Discharge Temperature:
• Default signal is RTD. Discharge temperature calibra-
tion is set in the calibration screen.
Oil Separator Temperature:
• Default signal is RTD. Oil separator temperature cali-
bration is set in the calibration screen.
Oil Manifold Temperature:
• Default signal is RTD. Oil manifold temperature cali-
bration is set in the calibration screen.
Process Temperature:
• Default signal is 4-20mA. Process temperature cali-
bration and range are set in the calibration screen.
Chiller Inlet Temperature:
• Default signal is 4-20mA. Measures separator level.
Chiller Inlet Temperature calibration and range are
set in the calibration screen.
Condenser Pressure:
• Default signal is 4-20mA. Condenser pressure trans-
ducer range and calibration is set in the calibration
screen.
Remote Caphold:
• Default signal is 4-20mA. Active in “Direct I/O” mode.
Adjusts the capacity of the compressor from 0-100%,
proportional to the 4-20mA signal.
Auxiliary #1 - #16:
• Flexible analog inputs that can be confi gured to con-
trol, alarm or trip.
Analog Outputs:
Refer to Table 3-3. Analog Outputs.
Compressor VFD:
• 4-20mA output to control compressor motor speed
with a Variable Frequency Drive (VFD).
Condenser / Remote Oil Cooler VFD:
• 4-20mA output to control one condenser / remote oil
cooler fan which is interleaved between the remain-
ing condenser / remote oil cooler 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 liq-
uid 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 compressor for
oil cooling purposes.
Auxiliary Outputs #1 - #4:
• Optional outputs that can be confi gured in user de-
fi ned manner.
• When Oil Flow Control option is selected from confi g-
uration screen, Auxiliary Output #1 which is 4-20mA
signal is used to control the opening percentage of
Danfoss valve.
Section 3 • Hardware Architecture