Emerson 20/20 service manual Analog Outputs, Control

Page 89

Section 18 • Auxiliary Input / Output

•High Alarm:

•This defines the upper limit of the input value, that when exceeded will generate an alarm.

•Low Trip:

•Defines the lower limit of the input value that when exceeded will generate a trip.

•High Trip:

•Defines the upper limit of the input value that when exceeded will generate a trip.

Analog Outputs

This screen allows to map any standard analog input or auxiliary input to any of the four analog auxiliary out- puts. There are two pages of auxiliary output configura- tion, each consists of two analog auxiliary outputs.

•Active Input:

•Active Input can be selected from avail- able standard analog inputs or auxiliary inputs. Selected Active Input gets mapped to auxiliary output.

•Run Always:

•“Run Always” option can be selected to en- able mapped auxiliary output irrespective of the compressor’s run state. If “Run Always” is not selected then the mapped auxiliary output is enabled only when compressor is running.

•Trigger:

•Trigger configuration is used to enable / dis- able auxiliary output according to the config- ured trigger input. Trigger input can be selected from available standard analog inputs , auxiliary analog inputs or digital inputs. Trigger value and differential in combination with trigger type (“enable if above / On” or “enable if below / Off”) enables or disables auxiliary output.

Control

Auxiliary outputs can be PID Controlled or Scalable Controlled.

P = Proportional (gain):

•Used to adjust the auxiliary output in direct propor- tion to the difference between the control setpoint and the active input . The proportional term is a unit less quantity and is used for coarse adjustment. This

setpoint should be set to the lowest value that gives adequate control system response. Increasing the proportional setting increases the control system’s sensitivity to small process fluctuations and the ten- dency to hunt.

I = Integral (reset):

•Used to integrate the error over time, to account for a small error that has persisted for a long time. This quantity is used for fine adjustment. This setpoint is used to smooth out process variations. This setpoint should be set high enough to prevent hunting but not too high or it will cause control system overshoot.

D = Derivative (rate):

•Used to account for how fast the error is changing, positively or negatively.

Scalable Control:

•Minimum Input / Maximum Input:

•These setpoints defines minimum and maxi- mum Input range for configured active input .

•Minimum Output / Maximum Output:

•These setpoints defines minimum and maxi- mum output. The Auxiliary output produces a linear value based on these settings.

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 Digital I/O Board Layout Top Status Bar TOCCompressor Sequencing Event List Data Backup List of Tables and Figures END of TOC How to Use This Manual Requirements to Start Compressor Operational Flow ChartsCritical Compressor Run Logic at Compressor Start Compressor Amperage Load LimitingOperational Flow Charts 2 Voltage Source Installation RecommendationsProper Wiring Sizing Mixing Voltages DC signalsGrounding Correct Transformer Wiring Method Wiring MethodsBest Practices Overview Hardware ArchitectureDigital Input/Output I/O Board Description Type Digital I/O 1Refer to -2. Analog Inputs Motor Current Analog InputsAnalog Inputs 1 Digital I/O 2Digital & Analog I/O Boards Layout Analog OutputsDigital I/O Board Layout Analog Inputs 2Digital Output Board Layout Digital Output BoardsDigital Input Board Layout Digital Input BoardsDigital Input-Output Board Layout Digital In-Out BoardsAnalog Input Board Layout Analog Input BoardsAnalog Input Jumper Tables Channel SignalJP-13 JP-14 JP-15 JP-31 Analog Output Board Layout Analog Output BoardsMain Screen Main ScreenTop Status Bar Parameter Bar Unit Start Pop-Up Window Bottom Status Bar Splash Screen Navigation Buttons Menu ScreenMenu Screen Pulse Proportional Control Compressor ControlProportional Band & Setpoint Auto-CycleVFD One-Step Control Method Variable Frequency Drive VFDPumpdown Control Pulldown Control Volume Slide Position Offset Control ModeStop Load and Force Unload Capacity Slide Triggered OutputsLiquid Injection Load AnticipatingOil Control Compressor Control Alarms and Trips Setpoints Alarms and TripsAlarms and Trips Compressor Inhibits Safety Failure MessagesFalse Start Timer Setpoints TimersOil Separator Level #2 Safety Trip Delay Timers Blank Scheduling Setpoint Compressor SchedulingCompressor Scheduling Pressure Control Setpoints Compressor SequencingCFM Equipment List 10 4 / Blank Condenser Control Setpoint Condenser ControlStep Control Step Control Screen VFD Settings11 4 / Blank Digital Outputs Service OptionsAnalog Outputs Instruments Calibration Pressure and Temperature InputsRemote Capacity Motor CurrentAnalog Inputs 13 4 / Blank Capacity Slide Valve Potentiometer Slide CalibrationSlide Valve Actuator Calibration for Optical Style Motors Volume Slide Valve PotentiometerSlide Valve Operation Photochopper Command Shaft Rotation Required By Actuator Command Shaft RotationSlide Valve Troubleshooting Guide 1 Slide Valve Troubleshooting GuideSlide Valve Troubleshooting Guide 2 LED Blink Codes and Troubleshooting Guide 1 Slide Valve Actuator Troubleshooting Guide Blink CodePleted. The actuator will not move while this error code LED Blink Codes and Troubleshooting Guide 2Chart Operation Trend ChartTrend Data Storage Trend Setup Screen Setup15 4 / Blank Event list Columns Event List16 2 / Blank Input/Output Screen Input / Output17 2 / Blank Digital Inputs Auxiliary Input / OutputDigital Outputs Control 18 4 / Blank Time & Date ConfigurationUnits Anti-Recycle CommunicationsTouchscreen Compressor Sequencing Restart On Power FailureLanguage Model & RefrigerantOptional Function Selection Compressor ControlOil Pump Condenser ControlOil Cooling Motor Current DeviceDigital Inputs Analog Inputs Analog Outputs Configuration 19 10 / Blank Save / Load Data BackupData Backup Migrate Factory Reset20 4 / Blank Checklist MaintenanceLog ChartApply User AccessManage Accounts LoginScreen Security Levels Security Access Levels22 4 / Blank Help Screen Screen FeaturesVersion Pop-Up Screen Twin Screw Control Screen Twin Screw ControlOperation Cool Compression Control Screen Cool Compression ControlCool Compression Control Functions Screen Control FunctionsOperational Differences from Single Screw Auto Load TimerCool Compression Control

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