Emerson 20/20 service manual Volume Slide Valve Potentiometer, Slide Valve Operation

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Section 14 • Slide Calibration

mechanical stops for normal slide travel. These soft- ware limits purpose is to prevent the slide from actu- ally hitting the mechanical stops which could result in a number of undesirable consequences. By default, the software limits are set to 150mV from either end point. The position percentage is calculated from the software limits. Therefore, it is possible to read a val- ue greater than 100% or less than 0% if inertial carries the slides after these limits are reached.

Volume Slide Valve Potentiometer

•This section provided critical information and con- trol parameters related to the volume slide actuator. The “% Vol” display shows the actual value in percent of the volume slide with out any conditioning that might be applied to the other volume position dis- plays. In addition, this section displays the value of the actuator signals in millivolts in the “input Value” display box.

“-” Button:

•When the operator presses and holds this button, the output associated with volume slide decreases is energized. If the actuator does not turn in the cor- rect direction when this button is pressed, then the operator will have to alter how the actuator is wired to the panel.

“+” Button:

•When the operator presses and holds this button, the output associated with volume slide increase is energized. If the actuator does not turn in the cor- rect direction when this button is pressed, then the operator will have to alter how the actuator is wired to the panel.

Software limit setpoint:

•The Vission 20/20 uses the “Min Limit” and “Max Limit” setpoint to define an area within the mechani- cal stops for normal slide travel. These software limits purpose is to prevent the slide from actually hitting the mechanical stops which could result in a number of undesirable consequences. By default, the soft- ware limits are set to 150mV from either end point. The position percentage is calculated from the soft- ware limits. Therefore It is possible to read a value greater than 100% or less than 0% if inertial carries the slides after these limits are reached.

Slide Valve Operation

The slide valve actuator is a gear-motor with a position sensor. The motor is powered in the forward and reverse

directions from the main computer in the control panel. The position sensor tells the main computer the position of the slide valve. The main computer uses the position and process information to decide where to move the slide valve next.

During calibration, the position sensor records the high and low count of motor turns. The operator tells the position sensor when the actuator is at the high or low position with the push button. Refer to the calibration instructions for the detailed calibration procedure.

The position sensor can get “lost” if the motor is moved while the position sensor is not powered. To prevent this, the motor can only be moved electrically while the position sensor is powered. When the position sen- sor loses power, power is cut to the motor. A capaci- tor stores enough energy to keep the position sensor circuitry alive long enough for the motor to come to a complete stop and then save the motor position to non- volatile EEPROM memory. When power is restored, the saved motor position is read from EEPROM memory and the actuators resumes normal function This scheme is not foolproof. If the motor is moved manually while the power is off or the motor brake has failed, allowing the motor to free wheel for too long after the position sen- sor looses power, the actuator will loose its calibrated position.

A brake failure can sometimes be detected by the po- sition sensor. If the motor never stops turning after a power loss, the position sensor detects this, knows it will be lost, and goes immediately into calibrate mode when power is restored.

Slide Valve Actuator Calibration for Optical Style Motors

Assuming that the actuator motors have not been cali- brated, the transmitter output of the actuator motor will fluctuate wildly until they are calibrated. To prevent damage to actuator motors, do not connect the Power Cable (Yellow TURCK cable) or the Position Transmitter Cable (Gray TURCK cable) until instructed to do so in this procedure.

1.Open the plastic cover of the capacity motor by re- moving the four #10 Pan Head Phillips screws. Gently lift the cover and tilt it toward the TURCK connectors. Raise the cover enough to be able to press the blue calibrate button and to be able to see the red LED on the top of the assembly, see Figure 14-2. Photochopper.

2.Remove actuator motor cover(s).

3.Log In on the Vission 20/20.

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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 Operational Flow Charts Requirements to Start CompressorCritical Compressor Run Logic at Compressor Start 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 Control Mode Volume Slide Position OffsetStop Load and Force Unload 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 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

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