Emerson Vission 20/20 Operation manual

Vission 20/20 micro-controller
Operation and service manual • Version 2.0

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Seller warrants the products it manufactures to be free from defects in material and workmanship for a period of eigh-
teen (18) months from the date of shipment from Seller’s manufacturing plant or twelve (12) months from date of
installation at the initial end users location, whichever occurs first. In addition, Seller provides the following extended
warranties: (a) three (3) years from the date of shipment on single screw compressor internal rotating parts, (b) two
(2) years from the date of shipment on reciprocating compressors and single screw and reciprocating compressor
parts, and (c) two (2) years on all other parts on a single screw compressor unit. Such warranties do not apply to
ordinary wear and tear. Seller does not warrant that the product complies with any particular law or regulation not ex-
plicitly set forth in the specifications, and Buyer is responsible for ensuring that the product contains all features nec-
essary to safely perform in Buyer’s and its customer’s plants and operations. Buyer must notify Seller of any warranty
claim within ten (10) days after such claim arises, otherwise Buyer waives all rights to such claim. Products supplied
by Seller, which are manufactured by others, are not warranted by Seller, but rather Seller merely passes through the
manufacturer’s warranty to Buyer.
SELLER EXPRESSLY DISCLAIMS ALL OTHER WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Unless otherwise agreed in writing, Buyer’s sole remedy for breach of warranty is, at Seller’s option, the re-pair of the
defect, the correction of the service, or the providing a replacement part FOB Seller’s office. Seller will not be respon-
sible for costs of dismantling, lost refrigerant, reassembling, or transporting the product. Further, Seller will not be
liable for any other direct, indirect, consequential, incidental, or special damages arising out of a breach of warranty.
THESE WARRANTY REMEDIES ARE EXCLUSIVE AND ALL OTHER WARRANTY REMEDIES ARE EXCLUDED. Products or
parts for which a warranty claim is made are to be returned transportation prepaid to Seller’s factory. Any improper
use, corrosion, neglect, accident, operation beyond rated capacity, substitution of parts not approved by Seller, or
any alteration or repair by others which, in Seller’s judgement, adversely affects the Product, shall void all warranties
and warranty obligations. Further, Seller shall not be liable under the above warranties should Buyer be in default of its
payment obligations to Seller under this Agreement or any credit agreement.
Standard Vilter Warranty Statement
i

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
READ CAREFULLY BEFORE OPERATING YOUR COMPRESSOR.
The following instructions have been prepared to assist in operation of Vilter Vission 20/20 micro-controllers.
The entire manual should be reviewed before attempting to operate.
Vilter micro-controllers are thoroughly inspected at the factory. However, damage can occur in shipment.
For this reason, the equipment should be thoroughly inspected upon arrival. Any damage noted should be
reported immediately to the Transportation Company. This way, an authorized agent can examine the unit,
determine the extent of damage and take necessary steps to rectify the claim with no serious or costly delays.
At the same time, the local Vilter representative or the home office should be notified of any claim made.
All inquires should include the Vilter sales order number, compressor serial and model number. These can be
found on the compressor nameplate on the compressor.
All requests for information, services or parts should be directed to:
Vilter Manufacturing LLC
Customer Service Department
P.O. Box 8904
5555 South Packard Ave
Cudahy, WI 53110-8904 USA
Telephone: [phone]
Fax:[phone]
E-mail: [e-mail]
Equipment Identification Numbers:
Vilter Order Number: _______________________Software Version: _________________
Vilter Order Number: _______________________Software Version: _________________
Vilter Order Number: _______________________Software Version: _________________
Vilter Order Number: _______________________Software Version: _________________
Important Message
ii

TOC - 1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Table of Contents
Section Title Section Number
Standard Vilter Warranty Statement ......................................................................................................i
Important Message................................................................................................................................ii
How To Use This Manual.........................................................................................................................TOC-8
Section 1 • Operational Flow Charts
Requirements to Start Compressor ........................................................................................................ 1-1
Critical Compressor Run Logic at Compressor Start................................................................................1-1
Compressor Amperage Load Limiting ....................................................................................................1-1
High Discharge Pressure Load Limiting..................................................................................................1-1
Suction Pressure Override Load Limit During Temperature Control ........................................................1-2
Section 2 • Installation Recommendations
Proper Wiring Sizing .............................................................................................................................. 2-1
Voltage Source ......................................................................................................................................2-1
Grounding .............................................................................................................................................2-2
Mixing Voltages .....................................................................................................................................2-2
DC signals..............................................................................................................................................2-2
Wiring Methods.....................................................................................................................................2-3
Best Practices.........................................................................................................................................2-4
Section 3 • Hardware Architecture
Overview ...............................................................................................................................................3-1
Digital Input/Output (I/O)......................................................................................................................3-2
Analog Inputs ........................................................................................................................................3-4
Analog Outputs .....................................................................................................................................3-6
Digital & Analog I/O Boards Layout.........................................................................................................3-7
Digital Outpout Boards ..........................................................................................................................3-8
Digital Input Boards ...............................................................................................................................3-9
Digital In-Out Boards .............................................................................................................................3-10
Analog Input Boards ..............................................................................................................................3-11
Analog Input Jumper Tables ...................................................................................................................3-12
Analog Output Boards ...........................................................................................................................3-14
Section 4 • Main Screen
Overview ...............................................................................................................................................4-1
Top Status Bar........................................................................................................................................ 4-2
Parameter Bar........................................................................................................................................4-3
Bottom Status Bar..................................................................................................................................4-5
Splash Screen.........................................................................................................................................4-6
Section 5 • Menu Screen
Overview ...............................................................................................................................................5-1
Navigation Buttons ................................................................................................................................5-1
Section 6 • Compressor Control
Overview ...............................................................................................................................................6-1
Suction Pressure Control and Process Temperature Control ...................................................................6-1
Auto-Cycle .............................................................................................................................................6-2
Variable Frequency Drive (VFD)..............................................................................................................6-4
Rapid Cycling VFD Control......................................................................................................................6-6
Pumpdown Control................................................................................................................................6-7

TOC - 2 Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Pulldown Control................................................................................................................................... 6-7
Control Mode......................................................................................................................................... 6-10
Stop load & Force unload .......................................................................................................................6-10
Capacity Slide Triggered Outputs...........................................................................................................6-11
Volume Slide Position Offset ..................................................................................................................6-12
Soft Load ...............................................................................................................................................6-12
Load Anticipating...................................................................................................................................6-12
Oil Control ............................................................................................................................................. 6-12
Liquid Injection ......................................................................................................................................6-12
Section 7 • Alarms and Trips
Overview ...............................................................................................................................................7-1
Alarms and Trips Setpoints.....................................................................................................................7-1
Compressor Inhibits...............................................................................................................................7-5
Safety Failure Messages .........................................................................................................................7-5
Compressor Warnings............................................................................................................................7-6
Section 8 • Timers
Overview ...............................................................................................................................................8-1
Timer Setpoints .....................................................................................................................................8-1
Section 9 • Compressor Scheduling
Overview ...............................................................................................................................................9-1
Scheduling Setpoint...............................................................................................................................9-1
Section 10 • Compressor Sequencing
Overview ...............................................................................................................................................10-1
Pressure / Temperature Control Setpoints..............................................................................................10-1
Capacity Load/Unload Timers ................................................................................................................10-2
Compressor Sequencing Table ...............................................................................................................10-3
Configuration Overview.........................................................................................................................10-5
Compressor Setup for Slave Compressor Sequencing.................................................................10-5
Compressor Setup for Master Compressor Sequencing .............................................................. 10-7
Section 11 • Condenser Control
Overview ...............................................................................................................................................11-1
Condenser Control Setpoint...................................................................................................................11-1
Step Control...........................................................................................................................................11-2
VFD Settings .......................................................................................................................................... 11-3
Section 12 • Service Options
Overview ...............................................................................................................................................12-1
Digital Outputs ......................................................................................................................................12-1
Analog Outputs .....................................................................................................................................12-5
Section 13 • Instruments Calibration
Overview ...............................................................................................................................................13-1
Pressure and Temperature Inputs...........................................................................................................13-1
Motor Current........................................................................................................................................13-2
Remote Capacity ...................................................................................................................................13-4
Analog Inputs ........................................................................................................................................13-4
Analog Outputs .....................................................................................................................................13-5
Section Title Section Number
Table of Contents

TOC - 3
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 14 • Slide Calibration
Overview ...............................................................................................................................................14-1
Capacity Slide Valve Potentiometer........................................................................................................14-1
Volume Slide Valve Potentiometer ......................................................................................................... 14-2
Slide Valve Operation.............................................................................................................................14-2
Calibrate Slide Valve Actuators...............................................................................................................14-3
Command Shaft Rotation....................................................................................................................... 14-6
Slide Valve Troubleshooting Guide.........................................................................................................14-7
Slide Valve Actuator Troubleshooting Guide Blink Code .........................................................................14-9
Section 15 • Trend Chart
Overview ...............................................................................................................................................15-1
Chart Operation.....................................................................................................................................15-1
Trend Data Storage ................................................................................................................................ 15-2
Setup ..................................................................................................................................................15-3
Section 16 • Event List
Overview ...............................................................................................................................................16-1
Event list Columns..................................................................................................................................16-1
Section 17 • Input / Output
Overview ...............................................................................................................................................17-1
Section 18 • Auxiliary Input / Output
Overview ...............................................................................................................................................18-1
Digital Inputs .........................................................................................................................................18-1
Digital Outputs ......................................................................................................................................18-2
Analog Inputs ........................................................................................................................................18-2
Analog Outputs .....................................................................................................................................18-4
Control .................................................................................................................................................. 18-4
Section 19 • Configuration
Overview ...............................................................................................................................................19-1
Units ..................................................................................................................................................19-1
Time & Date...........................................................................................................................................19-2
Communications ................................................................................................................................... 19-2
Touchscreen ..........................................................................................................................................19-2
Anti-Recycle........................................................................................................................................... 19-3
Restart On Power Failure........................................................................................................................19-3
Compressor Sequencing ........................................................................................................................19-3
Language...............................................................................................................................................19-3
Model & Refrigerant...............................................................................................................................19-3
Compressor Control...............................................................................................................................19-4
Optional Function Selection...................................................................................................................19-4
Vilter Only Settings................................................................................................................................19-5
Condenser Control.................................................................................................................................19-5
Oil Pump................................................................................................................................................19-5
Oil Cooling.............................................................................................................................................19-5
Motor Current Device ............................................................................................................................19-6
Digital Inputs .........................................................................................................................................19-7
Analog Inputs ........................................................................................................................................19-8
Analog Outputs .....................................................................................................................................19-9
Digital Outputs ......................................................................................................................................19-9
Section Title Section Number
Table of Contents

TOC - 4 Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
I/O Configuration...................................................................................................................................19-10
Section 20 • Data Backup
Overview ...............................................................................................................................................20-1
Save / Load.............................................................................................................................................20-1
Migrate..................................................................................................................................................20-3
Factory Reset .........................................................................................................................................20-3
Setpoints Report.................................................................................................................................... 20-4
Section 21 • Maintenance
Overview ...............................................................................................................................................21-1
Checklist................................................................................................................................................21-1
Notes .................................................................................................................................................. 21-2
Log ..................................................................................................................................................21-2
Chart ..................................................................................................................................................21-2
Section 22 • User Access
Overview ...............................................................................................................................................22-1
Apply ..................................................................................................................................................22-1
Login ..................................................................................................................................................22-2
Manage Accounts ..................................................................................................................................22-2
VNC Account .........................................................................................................................................22-4
Screen Security Levels............................................................................................................................22-4
Section 23 • Help Screen
Overview ...............................................................................................................................................23-1
Screen Features .....................................................................................................................................23-1
Section 24 • Twin Screw Control
Overview ...............................................................................................................................................24-1
Setup - Configuration Screen .................................................................................................................24-1
Operation ..............................................................................................................................................24-2
Slide Calibration - Capacity Slide Valve Potentiometer............................................................................24-2
Section 25 • Cool Compression Control
Overview ...............................................................................................................................................25-1
Setup ..................................................................................................................................................25-1
Control Functions ..................................................................................................................................25-2
Operational Differences from Single Screw ............................................................................................25-4
Section 26 • Remote Oil Cooler
Overview ...............................................................................................................................................26-1
Remote Oil Cooler Setpoint....................................................................................................................26-1
Step Control...........................................................................................................................................26-2
VFD Settings .......................................................................................................................................... 26-2
Appendix A • Vission 20/20 Troubleshooting Guide
Vission 20/20 Troubleshooting Guide..................................................................................................... A-1
Appendix B • Vission 20/20 Application Procedures
Vission 20/20 Application Procedures ....................................................................................................B-1
Section Title Section Number
Table of Contents

TOC - 5
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
List of Tables and Figures
Table/Figure Page Number
Table 3-1. Digital I/O ..............................................................................................................................3-3
Table 3-2. Analog Inputs......................................................................................................................... 3-5
Table 3-3. Analog Outputs...................................................................................................................... 3-7
Table 3-4. Analog Input Jumper Tables...................................................................................................3-12
Table 10-1. Status Symbols ....................................................................................................................10-4
Table 14-1. Command Shaft Rotation Required By Actuator...................................................................14-6
Table 14-2. Slide Valve Troubleshooting Guide .......................................................................................14-7
Table 14-3. LED Blink Codes and Troubleshooting Guide.........................................................................14-9
Table 22-1. Security Access Levels ..........................................................................................................22-4
Figure 1-1. Operational Flow Charts .......................................................................................................1-1
Figure 2-1. Vission 20/20 with Individual Transformer............................................................................2-1
Figure 2-2. EMI and Vission 20/20 ..........................................................................................................2-1
Figure 2-3. Ground Wiring .....................................................................................................................2-2
Figure 2-4. Mixed Voltage Wiring...........................................................................................................2-2
Figure 2-5. Correct Transformer Wiring Method ....................................................................................2-3
Figure 2-6. Incorrect Transformer Wiring Method ..................................................................................2-3
Figure 3-1. Hardware Architecture Overview .........................................................................................3-1
Figure 3-2. Digital I/O Board Layout........................................................................................................3-7
Figure 3-3. Digital Output Board Layout.................................................................................................3-8
Figure 3-4. Digital Input Board Layout....................................................................................................3-9
Figure 3-5. Digital Input-Output Board Layout........................................................................................3-10
Figure 3-6. Analog Input Board Layout ...................................................................................................3-11
Figure 3-7. Analog Output Board Layout ................................................................................................3-14
Figure 4-1. Main Screen..........................................................................................................................4-1
Figure 4-2. Top Status Bar ......................................................................................................................4-2
Figure 4-3. Parameter Bar ......................................................................................................................4-3
Figure 4-4. Unit Start Pop-Up Window ...................................................................................................4-4
Figure 4-5. Bottom Status Bar ................................................................................................................4-5
Figure 4-6. Splash Screen .......................................................................................................................4-6
Figure 5-1. Menu Screen ........................................................................................................................5-1
Figure 5-2. Menu Screen with Remote Oil Cooler Enabled.......................................................................5-2
Figure 6-1. Compressor Control Screen - Suction Pressure Control .........................................................6-1
Figure 6-2. Compressor Control Screen - Process Temperature Control .................................................. 6-2
Figure 6-3. Proportional Band & Setpoint ...............................................................................................6-3
Figure 6-4. Compressor Control Screen - VFD Settings Control ............................................................... 6-4
Figure 6-5. VFD One-Step Control Method ............................................................................................. 6-5
Figure 6-6. VFD Two-Step Control Method .............................................................................................6-5
Figure 6-7. Compressor Control Screen - Rapid Cycling VFD Control ....................................................... 6-6
Figure 6-8. Compressor Control Screen - Pumpdown/Pulldown Control ................................................ 6-8
Figure 6-9. Compressor Control Screen - Misc. 1 (Control Mode)............................................................6-9
Figure 6-10. Compressor Control Screen - Misc. 2 (Economizer & Hot Gas Bypass Control) ..................... 6-11
Figure 6-11. Compressor Control Screen - Oil Control & Liquid Injection Control .................................... 6-13
Figure 7-1. Alarms and Trips Screen - Page 1...........................................................................................7-1
Figure 7-2. Alarms and Trips Screen - Page 1 as Level 2 User....................................................................7-2
Figure 7-2. Alarms and Trips Screen - Page 2...........................................................................................7-3
Figure 7-2. Alarms and Trips Screen - Page 3 ..........................................................................................7-4
Figure 8-1. Timers Screen - Page 1..........................................................................................................8-1
Figure 8-2. Timers Screen - Page 2..........................................................................................................8-3
Figure 9-1. Compressor Scheduling Screen ............................................................................................9-1
Figure 10-1. Compressor Sequencing Screen - Page 1 ............................................................................10-1
Figure 10-2. Compressor Sequencing Screen - Page 2 ............................................................................10-2
Figure 10-3. Compressor Sequencing Screen - Page 3 ............................................................................10-3
Figure 10-4. Compressor Setup for Slave Compressor Sequencing ......................................................... 10-5

TOC - 6 Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
List of Tables and Figures
Table/Figure Page Number
Figure 10-5. Placing Slave Compressors in Remote Mode .......................................................................10-6
Figure 10-6. Compressor Setup for Master Compressor Sequencing....................................................... 10-7
Figure 11-1. Condenser Control Screen - Page 1 .....................................................................................11-1
Figure 11-2. Condenser Control Screen - Page 2 .....................................................................................11-4
Figure 12-1. Service Options Screen - Digital Outputs (Page 1)...............................................................12-1
Figure 12-2. Service Options Screen - Digital Outputs (Page 2)...............................................................12-2
Figure 12-3. Service Options Screen - Digital Outputs (Page 3)...............................................................12-3
Figure 12-4. Service Options Screen - Digital Outputs for Remote Oil Cooler (Page 3)............................. 12-4
Figure 12-5. Service Options Screen - Analog Outputs (Page 4) .............................................................. 12-5
Figure 13-1. Instruments Calibration Screen - Analog Inputs (Page 1).....................................................13-1
Figure 13-2. Instruments Calibration Screen - Analog Inputs (Page 2) .................................................... 13-2
Figure 13-3. Instruments Calibration Screen - Analog Inputs (Page 3).....................................................13-3
Figure 13-4. Instruments Calibration Screen - Analog Inputs (Page 4).....................................................13-4
Figure 13-5. Instruments Calibration Screen - Analog Inputs (Page 5).....................................................13-5
Figure 13-6. Instruments Calibration Screen - Analog Outputs (Page 6)..................................................13-6
Figure 14-1. Slide Calibration Screen......................................................................................................14-1
Figure 14-2. Actuator Assembly .............................................................................................................14-3
Figure 14-3. Menu Screen and Slide Calibration Button (Vission 20/20)..................................................14-4
Figure 14-4. Photo-chopper...................................................................................................................14-5
Figure 15-1. Trend Chart Screen.............................................................................................................15-1
Figure 15-2. Trend Setup Screen.............................................................................................................15-3
Figure 16-1. Event List Screen.................................................................................................................16-1
Figure 17-1. Input/Output Screen - Page 1 .............................................................................................17-1
Figure 17-2. Input/Output Screen - Page 2 .............................................................................................17-2
Figure 17-3. Input/Output Screen - Page 3 .............................................................................................17-2
Figure 17-4. Input/Output Screen - Page 4 .............................................................................................17-3
Figure 17-5. Input/Output Screen - Page 4 (Remote Oil Cooler Enabled)................................................. 17-3
Figure 17-6. Input/Output Screen - Freeze Data Page .............................................................................17-4
Figure 18-1. Auxiliary I/O Screen - Digital Inputs (Page 1) .......................................................................18-1
Figure 18-2. Auxiliary I/O Screen - Digital Outputs (Page 2) ....................................................................18-3
Figure 18-3. Auxiliary I/O Screen - Analog Inputs (Page 3) ......................................................................18-3
Figure 18-4. Auxiliary I/O Screen - Analog Inputs (Page 4) ......................................................................18-5
Figure 18-5. Auxiliary I/O Screen - Analog Inputs (Page 5) ......................................................................18-5
Figure 18-6. Auxiliary I/O Screen - Analog Outputs (Page 6) ...................................................................18-6
Figure 18-7. Auxiliary I/O Screen - Analog Outputs (Page 7) ...................................................................18-6
Figure 19-1. Configuration Screen - Initial Setup (Page 1).......................................................................19-1
Figure 19-2. Configuration Screen - Compressor Sequencing (Page 2)....................................................19-4
Figure 19-3. Configuration Screen - Digital Auxiliaries (Page 3) ..............................................................19-7
Figure 19-4. Configuration Screen - Analog Auxiliaries (Page 4)..............................................................19-8
Figure 19-5. Configuration Screen - Analog and Digital Outputs (Page 5) ...............................................19-9
Figure 19-6. Configuration Screen - I/O Configuration (Page 6) ..............................................................19-10
Figure 20-1. Data Backup Screen - Save/Load .........................................................................................20-1
Figure 20-2. Data Backup Screen - Migrate and Factory Reset................................................................. 20-3
Figure 20-3. Data Backup Screen - Setpoints Report...............................................................................20-4
Figure 21-1. Maintenance Screen - Checklist ..........................................................................................21-1
Figure 21-2. Maintenance Screen - Log...................................................................................................21-2
Figure 21-3. Maintenance Screen - Chart................................................................................................21-3
Figure 22-1. User Access Screen - Login..................................................................................................22-1
Figure 22-2. User Access Screen - Manage Accounts...............................................................................22-2
Figure 22-3. User Access Screen - VNC Accounts.....................................................................................22-3
Figure 23-1. Help Screen - Manual..........................................................................................................23-1
Figure 23-2. Help Screen - USB ...............................................................................................................23-2
Figure 23-2. Version Pop-Up Screen .......................................................................................................23-2
Figure 24-1. Configuration Screen - Twin Screw Option..........................................................................24-1

TOC - 7
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
END OF TOC
List of Tables and Figures
Table/Figure Page Number
Figure 24-2. Slide Calibration - Twin Screw Control.................................................................................24-2
Figure 24-3. Slide Calibration - Twin Screw Bump Pop-Up Window......................................................... 24-3
Figure 25-1. Cool Compression Control Screen.......................................................................................25-1
Figure 25-2. Compressor Control Screen - Cool Compression Control (Page 4) ....................................... 25-2
Figure 26-1. Remote Oil Cooler Screen (Page 1) .....................................................................................26-1
Figure 26-2. Remote Oil Cooler VFD Screen (Page 2) ..............................................................................26-3

TOC - 8 Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
How to Use This Manual
NOTE
Manual revision should match software version.
This manual contains instructions for the Vission 20/20
Operation & Service Manual. It has been divided into 28
sections.
Section 1: Operational Flow Charts
Section 2: Installation Recommendations
Section 3: Hardware Architecture
Section 4: Main Screen
Section 5: Menu Screen
Section 6: Compressor Control
Section 7: Alarms & Trips
Section 8: Timers
Section 9: Compressor Scheduling
Section 10: Compressor Sequencing
Section 11: Condenser Control
Section 12: Service Options
Section 13: Instruments Calibration
Section 14: Slide Calibration
Section 15: Trend Chart
Section 16: Event List
Section 17: Input/Output
Section 18: Auxiliary Input/Output
Section 19: Configuration
Section 20: Data Backup
Section 21: Maintenance
Section 22: User Access
Section 23: Help Screen
Section 24: Twin Screw Control
Section 25: Cool Compression Control
Section 26: Remote Oil Cooler
Appendix A: Vission 20/20 Troubleshooting Guide
Appendix B: Application Procedures
It is highly recommended that the manual be reviewed
prior to servicing the Vission 20/20 system parts.
Figures and tables are included to illustrate key concepts.
Safety precautions are shown throughout the manual.
They are defined as the following:
WARNING - Warning statements are shown when there
are hazardous situations, if not avoided, will result in se-
rious injury or death.
CAUTION - Caution statements are shown when there
are potentially hazardous situations, if not avoided, will
result in damage to equipment.
NOTE - Notes are shown when there are additional infor-
mation pertaining to the instructions explained.
NOTICE - Notices are shown when there are important
information that can help avoid system failure.
ADDITIONAL IMPORTANT NOTES
• Due to continuing changes and unit updates, always
refer to the www.Vilter.com to make sure you have
the latest manual.
• Any suggestions for manual improvements can be
made to Vilter Manufacturing at the contact informa-
tion on page ii.
• For additional video information pertaining to the
Vission 20/20, refer to Emerson Climate Videos at
www.EmersonClimate.com

1 – 1
Figure 1-1. Operational Flow Charts (1 of 2)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 1 • Operational Flow Charts
Volume and
Capacity slides are
less than 5%
Oil Separator Temp
>Oil Sep Start Trip
Setpt
Filter Di Press <
Start Filter Di Trip
Setpt
Oil Pump On: Prelub Oil Press is > Prelub Oil
Press Reset Setpt for “Min Compressor Prelub Timer”
setting (typically 5 seconds)
Start Compressor
Start
Compressor
Is
Run Oil Press>
Prelub Oil Press
Reset setpt?
(Default 5 PSI)
Is
Run Oil Press>
Run Oil Press
Reset setpt?
(Default 40 PSI)
“Oil Press
Bypass at Comp
Start” timer
expires (60 sec
after start)
Run Oil Press Failure Run Oil Press Failure
“Filter Di Press Safety
Changeover” timer expires
(60 sec after start)
Is Filter Di >
Hi Filter Di Press Run
Trip Setpt
for 5 seconds
Oil Separator Temp
Safety Changeover
Timer expires (5 min
after start)
Is
Oil Sep Temp > Lo
Oil Sep Run Reset
setpt?
Run
Run Filter Di Press Failure Lo Run Oil Sep Temp Failure
Is
Motor Amps >
FLA (ON)
Setpt?
Is
Dsch Press >
Cutin (ON)
Setpt?
Is
Dsch Press >
Cutout (OFF)
Setpt?
Capacity Increase
Disabled
Capacity Decrease
until Amps < FLA x
1.0625
Normal Loading and
Unloading
Is
Motor Amps >
FLA (OFF)
Setpt?
Capacity Increase
Disabled
Capacity Decrease until
Dsch Press < ON Setpt x
1.0625
Normal Loading and
Unloading
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes Yes
YesYes
No
No
No
No
No
No
No
Requirements to Start Compressor
Critical Compressor Run Logic at Compressor Start
Compressor Amperage Load Limiting High Discharge Pressure Load Limiting

1 – 2
Figure 1-1. Operational Flow Charts (2 of 2)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 1 • Operational Flow Charts
Is
Suction Press <
Suct Press Cap
Dec ON
Setpt?
Capacity Increase
Disabled
Normal Loading and
Unloading
Decrease compressor capacity until Suction
Press > Suction Press Cap Decrease ON setpoint.
Is
Suction Press <
Suct Press Cap
Dec OFF
Setpt?
Yes
Yes
No
No
Suction Pressure Override Load Limit During Temperature Control
Section 1 •Operational Flow Charts

2 – 1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 2 •Installation Recommendations
Proper Wiring Sizing
• Always size wire gauges as specified by the National
Electrical Code (NEC) for electronic control devices.
• For improved noise immunity, install one size larger
wire gauge than the NEC requirement to assure am-
ple current-carrying capability.
• Never under size wire gauges.
Voltage Source
• Transformers block a large percentage of
Electro-Magnetic Interference (EMI). The Vilter
Vission 20/20 should be isolated with its own con-
trol transformer for the most reliable operation, see
Figure 2-1.
• Connecting the Vilter Vission 20/20 to breaker panels
and central control transformers exposes the Vission
20/20 to large amounts of EMI emitted from the
other devices connected to the secondary terminals
of the transformer. This practice should be avoided if
possible, see Figure 2-2.
Figure 2-1. Vission 20/20 with Individual Transformer
Figure 2-2. EMI and Vission 20/20

2 – 2 Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 2 •Installation Recommendations
Grounding
• Continuous grounds must be run from the util-
ity ground to the Vission 20/20, see Figure 2-3.
Grounding.
• Grounds must be copper or aluminum wire.
• Never use conduit grounds.
Mixing Voltages
• Separate different voltages from each other and sep-
arate AC from DC, see Figure 2-4.
Figure 2-4. Mixed Voltage Wiring
• Each voltage level must be run in separate conduit:
• If your installation site has wire-ways or conduit trays,
dividers must be installed between the different
voltages.
DC signals
• If your installation site has wire-ways or conduit trays,
dividers must be installed between the different
voltages.
Figure 2-3. Ground Wiring
• 460 VAC
• 230 VAC
• 120 VAC
• 24 VAC
• DC Signals

2 – 3
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 2 •Installation Recommendations
Figure 2-5. Correct Transformer Wiring Method
Wiring Methods
• Each Vission 20/20 panel should have its own indi-
vidual control transformer, see Figure 2-5 and Figure
2-6.
Figure 2-6. Incorrect Transformer Wiring Method

2 – 4 Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Section 2 •Installation Recommendations
Best Practices
• Do:
• Keep AC wires away from circuit boards.
• Always run conduit into the bottom or sides
of an enclosure.
• If the conduit must be placed in the top of an
enclosure, use a water-tight conduit fitting to
keep water from entering the enclosure.
• The Vission 20/20 is supplied with pre-
punched conduit holes. Use them!
• Don’t:
• Don’t run wires through the Vission 20/20
enclosure that are not related to the compres-
sor control.
• Don’t add relays, timers, transformers, etc. in
the Vission 20/20 enclosure without first check-
ing with Vilter.
• Don’t run conduit into the top of an enclosure.
• Don’t run refrigerant tubing inside the
enclosure.
• Don’t drill metal enclosures without taking
proper precautions to protect circuit boards
from damage.