Emerson 20/20 service manual Alarms and Trips

Page 48

Section 7 • Alarms and Trips

selected in the Control Mode dropdown selection found in the Compressor Control screen. An alarm or trip will be activated on a drop in process tempera- ture below the setpoint value.

Low Suction Temperature (Alarm & Trip):

•This is the low suction temperature safety. The alarm or trip will be activated if the suction temperature drops below the setpoint value.

High Discharge Temperature (Alarm & Trip):

•This is the high discharge temperature safety. The alarm or trip will be activated if the discharge tem- perature rises above the setpoint value.

Low Oil Separator Start Temperature (Alarm & Trip):

•This is the starting low oil separator temperature safety. The compressor is prevented from starting or running if the oil in the separator is below the alarm value. After a time delay (setting of the Oil Separator Temperature Safety Changeover timer), this safety is deactivated and the Low Oil Separator Run Temperature alarm and safety setpoints become active.

Low Oil Separator Run Temperature (Alarm & Trip):

•This is the running low oil separator temperature safety. After a time delay, (setting of the Oil Separator Temperature Safety Changeover timer), the Low Oil Separator Start Temperature is bypassed and Low Oil Separator Run Temperature alarm and safety set- points become active. The alarm or trip will be acti- vated if the oil temperature in the separator drops below the setpoint value.

Low Oil Injection Temperature (Alarm & Trip):

•This is the low oil injection safety. The alarm and trip setpoints are bypassed at start for a time pe- riod (setting of the Oil Injection Temperature Safety Changeover timer). The alarm and trip will be acti- vated after the time delay has expired.

High Oil Injection Temperature (Alarm & Trip):

•This is the high oil injection temperature safety. The alarm or trip will be activated if the oil injection tem- perature rises above the setpoint value.

Pre-lube Oil Pressure (Alarm & Trip):

•This is the pre-lube oil pump failure safety. If the pre-lube oil pressure does not rise above the alarm setting with in 60 seconds for a minimum time set at Minimum Comp. Pre-lube Time, then the start sequence will be aborted. The Minimum Comp. Pre- lube Time is set on the Timer screen. The pre-lube oil pressure is defined as manifold pressure minus dis- charge pressure. This safety insures adequate lubri- cation of the the compressor at startup.

Low (Run) Oil Pressure (Alarm & Trip):

•This is the running oil pressure safety. The normal alarm and trip setpoints of this safety are “messaged” as soon as the compressor starts. The “Pre lube Oil Pressure” Alarm and Trip setpoints are substituted into this safety setpoints for a time of the “Oil Pressure Bypass” timer (typically 60 seconds). After this timer expires, then the setpoints return back to the normal settings. The action of adjusting the setpoints for about a minute allows the (Run) Oil Pressure to build up to normal running pressures after the compressor starts. After the Oil Pressure Bypass Timer has ex- pired, the Oil Pressure must be above the normal set- points, or else an Alarm or Trip will occur. An alarm or trip will be active if the oil pressure drops below the normal setpoint values after the Oil Pressure Bypass timer has expired. This time limit is set on the Timer menu screen. Run oil pressure is defined as manifold pressure minus suction pressure.

High Filter Differential Pressure Start (Alarm & Trip):

•This safety allows a higher than normal filter differ- ential pressure to exist during the first minute after a compressor starts. This allows time for cold oil that is present in the oil piping and filters to be passed and replaced with warmer oil. After a time delay (set- ting of the Filter Diff Pressure Safety Changeover timer), this safety is deactivated and the High Filter Differential Pressure-Run alarm and safety setpoints become active. An alarm or trip will be active if the filter differential (= Filter Inlet Pressure minus Filter Outlet Pressure) exceeds the setpoint value.

High Filter Differential Pressure Run (Alarm & Trip):

•This safety setpoint is active when the compres- sor has started and the Filter Diff Pressure Safety Changeover timer has timed out. An alarm or trip will be active if the filter differential (= Filter Inlet Pressure minus Filter Outlet Pressure) exceeds by the setpoint value.

High Motor Amps:

•This safety setpoint is active after the Volume Decrease At Start Timer expires (this timer is not set- table by the operator). A trip will occur if the motor amperage exceeds the safety setpoint value. For a motor with a 1.15 Service Factor, the trip setpoint should be set at 125% of the motor full load amper- age value. The alarm setpoint should be set at 120% of the motor full load amperage value.

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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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