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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0

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.

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.

Figure B-36. Analog Output card wiring to VPLUS VFD controller

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