Emerson 20/20 service manual Step Control

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Section 11 • Condenser Control

Condenser Press:

•This is the read only parameter and it displays the present value of condenser pressure.

Condenser Setpoint:

•This is the condenser pressure setpoint that needs to be maintained.

Upper Deadband:

•This is the condenser pressure setpoint upper dead- band value. No additional condenser capacity is add- ed when the condenser is selected for automatic step control and the condenser pressure falls within this deadband.

Lower Deadband:

•This is the condenser pressure setpoint lower dead- band value. Condenser capacity is not reduced when the condenser is selected for automatic step control and the condenser pressure falls within this deadband.

Ambient Temp:

•This is the read only parameter and it displays the present value of ambient temperature. This is dis- played only when Ambient Sensor is enabled from Configuration Screen.

Wetbulb Temp:

•This is the read only parameter and it displays the present value of wetbulb temperature. This is dis- played only when Wetbulb Sensor is enabled from Configuration Screen.

Wetbulb Offset:

•This is the offset value from wetbulb temperature as the override point.

Switch Temp:

•This is the ambient temperature setpoint used for au- tomatic switching of profile from summer to winter and vice-versa.

Profile Selection:

•Profile selection allows operator to have two different output profiles for summer and winter. Operator can have different selection of fans, pumps & VFD in five steps of step control table. Different profiles allow inclusion/exclusion of water pumps in cold weather when summer/winter auto switch is enabled. This selection is inactive when Run mode is Auto and Summer/Winter Auto Switch is enabled.

High to Low Speed Fan Delay:

•This is a time delay for the fan spin down in case of 2- speed motor/dual speed fan.

Summer/Winter Auto Switch:

•This checkbox when enabled allows profiles to switch automatically depending on ambient temperature setpoint when Run Mode is “Auto”. When ambient temperature falls below ambient temperature set- point, winter profile is used. Similarly when ambient temperature is above ambient temperature setpoint, summer profile is used.

Wetbulb Override:

•This checkbox when enabled gives the operator a functionality to control energy wastage. When the condenser temperature reaches wetbulb tempera- ture plus the operator given offset, then the con- denser control operation does not add additional steps. This is done as it is not possible to lower the temperature anymore, and by adding more fans or pumps controls the operation by manually stepping using an on/off toggle button at each step.

Step Control

The Step Control allows the operator to setup the man- ner in which Fans, Pumps & VFD will be turned on/off. Fans & Pumps are connected on digital outputs Out #1 to Out #4. VFD Fan is connected on Analog Output. Each step can have maximum of five outputs connected to it. Each step can be opted in or out depending on enabling of checkbox, see Figure 11-2. Step Control Screen.

When Run Mode is Auto and condenser pressure rises above upper deadband, condenser step gets incremen- tal from Step 1 to Step 5 and hence switching on/off Pumps, Fans & VFD connected on outputs. This holds true for decremented of steps from Step 5 to Step 1 when condenser pressure falls below lower deadband.

Step Delay:

•Allows operator to set time delays between condens- er steps. Condenser Pressure must be outside upper or lower deadband continuously for delay time in or- der to increase or decrease condenser steps. While in a VFD step, an additional step can only be added once VFD has reached its maximum speed setpoint and the delay timers are satisfied.

•Similarly in a VFD step, a step can only be removed once VFD has reached its minimum speed setpoint and the delay timers are satisfied. Step Delay acts as “ON” timer while loading and acts as “OFF” timer while unloading for the same step.

Low Speed Fan:

•Allows steps to have option for time delay in case of fan spin down. Any of Out #1 to Out #4 can be

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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 Voltage Source Installation RecommendationsProper Wiring Sizing Mixing Voltages DC signalsGrounding 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 OutputsLiquid Injection Load AnticipatingOil Control 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 Actuator Calibration for Optical Style Motors Volume Slide Valve PotentiometerSlide Valve Operation 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 Time & Date ConfigurationUnits Anti-Recycle CommunicationsTouchscreen 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

20/20 specifications

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