Emerson Vission 20/20 Operation And Service Manual page 215

Appendix B • Vission 20/20 Application Procedures
VPLUS (AC Motor) Setup Procedure for
20/20 Panel
INTRODUCTION
This document provides guidelines to setup AC Motor
VPLUS oil cooling system control on the Vission 20/20
panel.
SCOPE
Vilter AC VPLUS oil cooling system utilizes a PID algo-
rithm in the Vission 20/20 panel to control the speed of
the VPLUS motor. The motor speed controls the amount
of liquid refrigerant being injected into the compressor
which is used for oil cooling. Motor speed is based on
discharge temperature. As the discharge temperature
varies from the liquid injection control setpoint, a modu-
lating 4-20ma signal wired to the AC motor VFD will ad-
just the speed of the motor.
Figure B-36. Analog Output card wiring to VPLUS VFD controller
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
This document provides instructions to help setup the
Vission 20/20 for VPLUS control.
ADDITIONAL HARDWARE
In order to control the VPLUS pump motor VFD, an ana-
log output card is required. The 4-20ma signal from the
card will be wired to the VFD and will vary the speed of
the VPLUS motor - thereby increasing and decreasing
the amount of liquid refrigerant that will be injected into
the compressor to provide oil cooling.
HARDWARE WIRING
The analog output card needs to be wired to the VPLUS
pump VFD, see Figure B-36.
B - 59