Emerson 20/20 service manual Compressor Inhibits, Safety Failure Messages

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Section 7 • Alarms and Trips

Compressor Inhibits

The Vission 20/20 uses several start inhibits to prevent the compressor from starting to protect the compres- sor and the refrigeration system. While starting the compressor, the inhibits are checked first before the oil pump is started or the motor is started. The failed starts due to an inhibit does not count toward any of the anti- recycle timers including hot starts. The Inhibits uses the alarm setpoint to trigger an aborted start and message. All inhibits will be logged in the event list.

Safety Failure Messages

Low Suction Pressure Trip

•This message will appear when the suction pressure falls below the safety setting of the Low Suction Pres- sure Trip Setpoint No.1 or No. 2.

High Discharge Pressure Trip

•This message will appear when the discharge pres- sure exceeds the safety setting of the Hi Dsch Press Trip Setpoint No. 1 or No. 2.

Low Suction Temp Trip

•This message will appear when the suction tempera- ture falls below the safety setting of the Low Suction Temperature Trip setpoint.

High Discharge Temp Trip

•This message will appear when the discharge tem- perature rises above the safety setting of the High Discharge Temperature Trip setpoint.

Low Oil Separator Temp Trip

•This message will appear when the Oil Separator Temp is below the Low Oil Separator Start Temp Trip setpoint. In addition this message will appear after the Oil Separator Temp Safety Changeover timer times out and the Oil Separator temperature fails to rise above the Low Oil Separator Start Temp Reset af- ter the compressor is started.

Low Oil Separator Temp Trip

•This message will appear when the Oil Separator Temp is below the Low Oil Separator Run Temp Reset setpoint after the Oil Separator Temp Safety Changeover timer times out.

Low Process Temp Trip

•This message will appear when the Process Control Temperature falls below the safety setting of the Lo Control Temperature Trip Setpoint.

Prelube Oil Pump Inhibit

•This message will appear when the Prelube Oil Pressure (Manifold minus Discharge) has remained below the Prelube Oil Pressure Reset setpoint. The oil pump will try to generate “prelube pressure” for the time period of the Low Oil Pressure Safety Bypass timer setting.

Low Oil Pressure Trip

•This message will appear when the Running Oil Pressure (Manifold minus Suction) has remained be- low the low Oil Pressure Reset setpoint when the Oil Pressure Bypass Start timer times out. This message will also appear when the Running Oil Pressure falls below the Low Oil Pressure trip setpoint after the Low Oil Pressure Safety Bypass timer times out.

Low Oil Injection Temp Trip

•This message will appear when the Oil Injection tem- perature falls below the Low Oil Injection Temperature trip setpoint. This message will also appear when the Oil Injection temperature fails to rise above the Low Oil Injection Temperature reset setpoint after the Low Oil Injection Temp Bypass timer times out.

High Oil Injection Temp Trip

•This message will appear when the Oil Injection temperature rises above the High Oil Injection Temperature trip setpoint.

High Filter Differential Trip

•This message will appear if the Filter Differential Pressure rises above the High Fltr Diff Press – Start setpoint before the Filter Differential Pressure Safety Changeover timer times out.

High Filter Differential Trip

•This message will appear if the Filter Differential pressure rises above the High Fltr Diff Press Run setpoint after the Filter Differential Pressure Safety Changeover timer times out.

High Motor Current Trip

•This message will appear if the motor amperage rises above the Hi Motor Amps trip setpoint.

Compressor Interlock Trip

•This message will appear if the Motor Auxiliary con- tact fails to close before the Compressor Starter Auxiliary Contact Bypass timer times out. Refer to wiring diagram.

High Level Shutdown Trip

•This message will appear when power is removed from the input module that is designated as “Auxiliary #1 Safety” (please refer to your wiring diagram).

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 Proper Wiring Sizing Installation RecommendationsVoltage Source Grounding DC signalsMixing Voltages 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 OutputsOil Control Load AnticipatingLiquid Injection 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 Operation Volume Slide Valve PotentiometerSlide Valve Actuator Calibration for Optical Style Motors 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 Units ConfigurationTime & Date Touchscreen CommunicationsAnti-Recycle 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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