How To Use This Manual ......................................................................................................................... TOC-9

Standard Vilter Warranty Statement ...................................................................................................... TOC-10

Requirements to Start Compressor ........................................................................................................ 1-1

Critical Compressor Run Logic at Compressor Start ................................................................................ 1-1

Compressor Amperage Load Limiting .................................................................................................... 1-1

Figure 1-1. Operational Flow Charts ....................................................................................................... 1-1

High Discharge Pressure Load Limiting .................................................................................................. 1-1

Suction Pressure Override Load Limit During Temperature Control ........................................................ 1-2

Proper Wiring Sizing .............................................................................................................................. 2-1

Voltage Source ...................................................................................................................................... 2-1

Figure 2-1. Vission 20/20 with Individual Transformer ............................................................................ 2-1

Figure 2-2. EMI and Vission 20/20 .......................................................................................................... 2-1

Grounding ............................................................................................................................................. 2-2

Mixing Voltages ..................................................................................................................................... 2-2

DC signals .............................................................................................................................................. 2-2

Figure 2-3. Ground Wiring ..................................................................................................................... 2-2

Figure 2-4. Mixed Voltage Wiring ........................................................................................................... 2-2

Wiring Methods ..................................................................................................................................... 2-3

Figure 2-5. Correct Transformer Wiring Method .................................................................................... 2-3

Figure 2-6. Incorrect Transformer Wiring Method .................................................................................. 2-3

Best Practices ......................................................................................................................................... 2-4

Overview ............................................................................................................................................... 3-1

Figure 3-1. Hardware Architecture Overview ......................................................................................... 3-1

Digital Input/Output (I/O) ...................................................................................................................... 3-2

Table 3-1. Digital I/O .............................................................................................................................. 3-3

Analog Inputs ........................................................................................................................................ 3-4

Table 3-2. Analog Inputs......................................................................................................................... 3-5

Analog Outputs ..................................................................................................................................... 3-6

Digital & Analog I/O Boards Layout ......................................................................................................... 3-7

Table 3-3. Analog Outputs...................................................................................................................... 3-7

Figure 3-2. Digital I/O Board Layout........................................................................................................ 3-7

Digital Outpout Boards .......................................................................................................................... 3-8

Figure 3-3. Digital Output Board Layout ................................................................................................. 3-8

Digital Input Boards ............................................................................................................................... 3-9

Figure 3-4. Digital Input Board Layout .................................................................................................... 3-9

Digital In-Out Boards ............................................................................................................................. 3-10

Figure 3-5. Digital Input-Output Board Layout ........................................................................................ 3-10

Analog Input Boards .............................................................................................................................. 3-11

Figure 3-6. Analog Input Board Layout ................................................................................................... 3-11

Analog Input Jumper Tables ................................................................................................................... 3-12

Table 3-4. Analog Input Jumper Tables ................................................................................................... 3-12

Analog Output Boards ........................................................................................................................... 3-14

Figure 3-7. Analog Output Board Layout ................................................................................................ 3-14

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9

Section 1 • Operational Flow Charts

Section 2 • Installation Recommendations

Section 3 • Hardware Architecture

Section Number

TOC - 1