Emerson 20/20 service manual Digital Input/Output I/O

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Section 3 • Hardware Architecture

Digital Input/Output (I/O)

Refer to Table 2-1. Digital I/O.

Compressor Start Output:

•When the Vission 20/20 signals the compressor to start, this output is energized. When the Vission 20/20 signals the compressor to stop, this output is de-energized.

Oil Pump Start Output:

•When the Vission 20/20 signals the oil pump to start, this output is energized. When the Vission 20/20 sig- nals the oil pump to stop, this output is de-energized.

Capacity Increase Output:

•This output is only active when the compressor is running. When the Vission 20/20 determines that the compressor should increase capacity by moving the slide valve to a higher percentage, this output is energized. Once the slide valve reaches 100%, this output will not energize.

Capacity Decrease Output:

•This output is only active when the compressor is running. When the Vission 20/20 determines that the compressor should decrease capacity by moving the slide valve to a lower percentage, this output is energized. Once the slide valve reaches 0%, this out- put will not energize.

Volume Increase Output:

•This output is only active when the compressor is running. When the Vission 20/20 determines that the compressor should increase Volume Index (VI) by moving the volume slide to a higher percentage, this output is energized. Once the volume slide reaches 100%, this output will not energize.

Volume Decrease Output:

•This output is only active when the compressor is run- ning. When the Vission 20/20 determines that the compressor should decrease Volume Index (VI) by moving the volume slide to a lower percentage, this output is energized. Once the volume slide reaches 0%, this output will not energize.

Oil Sump Heater Output:

•This output is active and energized when the oil separator temperature is lower than the oil separator temperature setpoint. It is de-energized when the oil separator temperature is higher than the oil separa- tor temperature setpoint.

Trip Output:

•This output is energized when the system has no Trips. If a trip is issued, the output de-energizes and stays de-energized until the trip condition is cleared.

Slide Valve Setpoint #1 Output (Economizer):

•Normally used for an economizer solenoid, but could be used for other devices. When the compressor slide valve percentage is equal to or greater than “slide valve set-point #1”, the output is energized. When the compressor slide valve percentage is less than “slide valve set-point #1”, the output is de-energized.

Slide Valve Setpoint #2 Output (Hot Gas):

•Normally used for a hot gas solenoid, but could be used for other devices. When the compressor slide valve percentage is equal to or greater than “slide valve set-point #2”, the output is energized. When the compressor slide valve percentage is less than “slide valve set-point #2”, the output is de-energized.

Alarm Output:

•This output is energized when the system has no alarms. If an alarm is issued, the output de-energizes and stays de-energized until the alarm condition is cleared.

Unused:

•This output has no current function. Liquid Injection #1 Output:

•If the compressor has liquid injection oil cooling, this output is active. When the compressor is running and the discharge temperature is above the oil separator temperature override setpoint and the oil separator temperature is above the override setpoint, then the output is energized. The output is de-energized when the discharge temperature falls below the “on” set- point minus the solenoid differential.

Liquid Injection #2 Output:

• Not Defined

Remote Enabled Output:

•This output is energized when the Vission 20/20 panel is enabled for remote control. The compres- sor can be running or stopped, but is available to the remote system. If the compressor has an alarm or is placed into the manual stop position, this output is de-energized.

Shunt Trip:

• Not defined.

Comp Motor Starter Auxiliary Contact:

•This input looks for a feedback signal from the com- pressor starter, confirming that the compressor starter is energized.

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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Contents Vission 20/20 micro-controller Page Table of Contents TOC Digital I/O Board Layout Top Status BarCompressor Sequencing Event List Data Backup List of Tables and Figures END of TOC How to Use This Manual Critical Compressor Run Logic at Compressor Start Operational Flow ChartsRequirements to Start Compressor Compressor Amperage Load LimitingOperational Flow Charts 2 Installation Recommendations Proper Wiring SizingVoltage Source DC signals GroundingMixing Voltages Wiring Methods Correct Transformer Wiring MethodBest Practices Hardware Architecture OverviewDigital Input/Output I/O Digital I/O 1 Board Description TypeAnalog Inputs Refer to -2. Analog Inputs Motor CurrentDigital I/O 2 Analog Inputs 1Analog Outputs Digital & Analog I/O Boards LayoutAnalog Inputs 2 Digital I/O Board LayoutDigital Output Boards Digital Output Board LayoutDigital Input Boards Digital Input Board LayoutDigital In-Out Boards Digital Input-Output Board LayoutAnalog Input Boards Analog Input Board LayoutChannel Signal Analog Input Jumper TablesJP-13 JP-14 JP-15 JP-31 Analog Output Boards Analog Output Board LayoutMain Screen Main ScreenTop Status Bar Parameter Bar Unit Start Pop-Up Window Bottom Status Bar Splash Screen Menu Screen Navigation ButtonsMenu Screen Compressor Control Pulse Proportional ControlAuto-Cycle Proportional Band & SetpointVariable Frequency Drive VFD VFD One-Step Control MethodPumpdown Control Pulldown Control Stop Load and Force Unload Control ModeVolume Slide Position Offset Capacity Slide Triggered OutputsLoad Anticipating Oil ControlLiquid Injection Compressor Control Alarms and Trips Alarms and Trips SetpointsAlarms and Trips Safety Failure Messages Compressor InhibitsFalse Start Timers Timer SetpointsOil Separator Level #2 Safety Trip Delay Timers Blank Compressor Scheduling Scheduling SetpointCompressor Scheduling Compressor Sequencing Pressure Control SetpointsCFM Equipment List 10 4 / Blank Condenser Control Condenser Control SetpointStep Control VFD Settings Step Control Screen11 4 / Blank Service Options Digital OutputsAnalog Outputs Pressure and Temperature Inputs Instruments CalibrationMotor Current Remote CapacityAnalog Inputs 13 4 / Blank Slide Calibration Capacity Slide Valve PotentiometerVolume Slide Valve Potentiometer Slide Valve OperationSlide Valve Actuator Calibration for Optical Style Motors Photochopper Command Shaft Rotation Command Shaft Rotation Required By ActuatorSlide Valve Troubleshooting Guide Slide Valve Troubleshooting Guide 1Slide Valve Troubleshooting Guide 2 Slide Valve Actuator Troubleshooting Guide Blink Code LED Blink Codes and Troubleshooting Guide 1LED Blink Codes and Troubleshooting Guide 2 Pleted. The actuator will not move while this error codeTrend Chart Chart OperationTrend Data Storage Setup Trend Setup Screen15 4 / Blank Event List Event list Columns16 2 / Blank Input / Output Input/Output Screen17 2 / Blank Auxiliary Input / Output Digital InputsDigital Outputs Control 18 4 / Blank Configuration UnitsTime & Date Communications TouchscreenAnti-Recycle Language Restart On Power FailureCompressor Sequencing Model & RefrigerantCompressor Control Optional Function SelectionOil Cooling Condenser ControlOil Pump Motor Current DeviceDigital Inputs Analog Inputs Analog Outputs Configuration 19 10 / Blank Data Backup Save / LoadData Backup Factory Reset Migrate20 4 / Blank Maintenance ChecklistChart LogUser Access ApplyLogin Manage AccountsSecurity Access Levels Screen Security Levels22 4 / Blank Screen Features Help ScreenVersion Pop-Up Screen Twin Screw Control Twin Screw Control ScreenOperation Cool Compression Control Cool Compression Control ScreenControl Functions Cool Compression Control Functions ScreenAuto Load Timer Operational Differences from Single ScrewCool Compression Control

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