Emerson 20/20 service manual Auto-Cycle, Proportional Band & Setpoint

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Section 6 • Compressor Control

As mentioned in the above paragraph, the distance of the process variable from the control setpoint deter- mines the size of the pulse used to move the capacity slide. This is called the proportional band and is set by the Proportional Setpoint. When the process variable is outside the proportional band, the slide will move in the direction of the error continuously. Increasing the size of the proportional band can help slow the compres- sors reaction by varying loads if desired, see Figure 6-2. Proportional Band & Setpoint.

The Dead Band Setpoint defines area around the control setpoint where the algorithm stops adjusting the capac- ity slide. This area is a percentage of the proportional band. By default the proportional band is set to 4 Psig and the dead band is set to 10% of 4 Psig. Making the dead band +/- 0.4 Psig of the control setpoint. Once the process variable is within the dead band, the algorithm considers the compressor to be on setpoint. If the op- erator wishes the compressor to operate closer, the set- point can be set to a smaller percentage. However this

will result in the capacity slide excessively moving to maintain the setpoint and could over heat the actuator or shorten the actuators operational life.

Auto-Cycle

The auto-cycle setpoints define the control points in which the compressor will automatically cycle on and off when the compressor has been placed into “Auto” run mode. These setpoints can be “enabled” or “disabled” using the check box. A delay can be entered to momen- tarily delay the start or stop from immediately occurring when the setpoint is met. If a compressor shutdown is desired on a suction pressure drop and a manual reset is required, set the OFF value below the Low Suction Pressure safety trip value. This will shut down the com- pressor and a Reset will be required to restart it.

Figure 6-2. Proportional Band & Setpoint

6 – 2

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 Operational Flow Charts Requirements to Start CompressorCritical Compressor Run Logic at Compressor Start Compressor Amperage Load LimitingOperational Flow Charts 2 Proper Wiring Sizing Installation RecommendationsVoltage Source Grounding DC signalsMixing 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 Control Mode Volume Slide Position OffsetStop Load and Force Unload Capacity Slide Triggered OutputsOil Control Load AnticipatingLiquid 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 PotentiometerSlide Valve Operation Volume Slide Valve PotentiometerSlide 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 Units ConfigurationTime & Date Touchscreen CommunicationsAnti-Recycle Restart On Power Failure Compressor SequencingLanguage Model & RefrigerantCompressor Control Optional Function SelectionCondenser Control Oil PumpOil Cooling 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

20/20 specifications

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