Emerson 20/20 service manual Slide Valve Troubleshooting Guide 1

Page 75

Section 14 • Slide Calibration

Slide Valve Troubleshooting Guide

The Analog output card of the Vission 20/20 produces a 4–20mA signal to any attached devices. However, it is not uncommon that small differences in the board components might result in small differences in the output. So this screen offers the operator the ability to fine tune the upper and lower output values, see Table 14-2. Slide Valve Troubleshooting Guide.

Table 14-2. Slide Valve Troubleshooting Guide (1 of 2)

Problem

Reason

Solution

 

Dirt or debris is blocking one or both

Clean the optocoupler slots with a

 

optocoupler slots.

cotton swab and rubbing alcohol.

 

 

Adjust the photochopper so that

 

 

the fence extends further into the

 

The photochopper fence extends

optocoupler slots. Make sure the

 

less than about half way into the

motor brake operates freely and

 

optocoupler slots.

the photochopper will not contact

 

 

the optocouplers when the shaft is

The actuator cannot be calibrated.

 

pressed down.

The white calibrate wire in the grey

Tape the end of the white wire in the

 

 

panel and make sure that it cannot

 

Turck cable is grounded.

 

touch metal.

 

 

 

Dirt and/or condensation on the

Clean the boards with an electronics

 

position sensor boards are causing it

 

cleaner or compressed air.

 

to malfunction.

 

 

The calibrate button is stuck down.

Try to free the stuck button.

 

The position sensor has failed.

Replace the actuator.

 

Push button is being held down for

Depress the button quickly and then

 

more that ¾ second when going

let go. Each ¾ second the button is

 

through the calibration procedure.

held down counts as another press.

 

The white calibrate wire in the

Tape the end of the white wire in the

The actuator goes into calibration

grey Turck cable is grounding

panel and make sure that it cannot

intermittently.

touch metal.

mode spontaneously.

 

 

A very strong source of electromag-

Increase the distance between the

 

 

EMI source and the actuator.

 

netic interference (EMI), such as a

 

Install additional metal shielding ma-

 

contactor, is in the vicinity of the

 

terial between the EMI source and

 

actuator or grey cable.

 

the actuator or cable.

 

 

 

 

 

 

The motor was manually moved

 

 

while the position sensor was not

Recalibrate.

The actuator does not transmit the

powered.

 

 

 

The motor brake is not working

Get the motor brake to where it op-

correct position after a power loss.

properly.

erates freely and then recalibrate.

 

 

 

 

 

The position sensor’s EEPROM

Replace the actuator.

 

memory has failed.

 

 

 

 

 

 

The photochopper is misaligned

Try to realign or replace the actuator.

There is a rapid clicking noise when

with the slotted optocouplers.

 

the motor is operating.

The motor brake is not working

Get the motor brake to where it op-

 

properly.

erates freely and then recalibrate.

 

 

 

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 Compressor Amperage Load Limiting Operational Flow ChartsRequirements to Start Compressor Critical Compressor Run Logic at Compressor StartOperational Flow Charts 2 Installation Recommendations Proper Wiring SizingVoltage Source DC signals GroundingMixing 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 Capacity Slide Triggered Outputs Control ModeVolume Slide Position Offset Stop Load and Force UnloadLoad Anticipating Oil ControlLiquid 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 CalibrationVolume Slide Valve Potentiometer Slide Valve OperationSlide 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 Configuration UnitsTime & Date Communications TouchscreenAnti-Recycle Model & Refrigerant Restart On Power FailureCompressor Sequencing LanguageOptional Function Selection Compressor ControlMotor Current Device Condenser ControlOil Pump Oil CoolingDigital 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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