Emerson 54e pH/ORP instruction manual Section Troubleshooting, Troubleshooting is easy as 1, 2, 3…

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MODEL 54e pH/ORP

SECTION 8.0

 

TROUBLESHOOTING

SECTION 8.0

TROUBLESHOOTING

The Model 54e pH/ORP automatically searches for fault conditions that would cause an error in the meas- ured pH reading. If such a condition occurs, the current outputs and alarm relays will act as configured in Section 5.6 and Section 5.7, the red "FAIL" LED on the controller panel will be lit and a diagnostic message will be displayed. If more than one fault exists, the display will sequence through the diagnostic messages. This will continue until the cause of the fault has been cor- rected or until the Ack 2 key is pressed.

Troubleshooting is easy as 1, 2, 3…

Step 1 Look for a diagnostic fault message on the dis- play to help pinpoint the problem. Refer to Table 8-1 for an explanation of the message and a list of the possible problems that trig- gered it.

Step 2 Refer to the Quick Troubleshooting Guide, Table 8-2, for common pH hardware problems and the recommended actions to resolve them.

Step 3 Follow the step by step troubleshooting approach offered in Table 8-3 to diagnose less common or more complex problems.

CAUTION

Do not attempt to troubleshoot unless you have familiarized yourself with this manual. Only trained, qualified techni- cians should perform these procedures. Do not attempt to troubleshoot, repair, or modify the printed circuit cards or elec- tronic components inside the controller.

IMPORTANT

Always recalibrate the controller before returning it to service.

Many control problems are unrelated to the pH meas- urement system. When problems arise, first check other systems that affect chemical concentration. Consider what may have changed in the system that can cause poor control. Some causes for poor control other than controller malfunction are:

1.An empty chemical drum.

2.Malfunction of a chemical feed pump, pump motor, or motor starter.

3.Water inlet or drain valves stuck or left open by operators.

4.Check flow interlocks (if used).

5.A temperature control malfunction.

6.Broken or blocked chemical feed lines.

7.A conductivity probe that has been left out of the bath.

8.The level of bath is below the probe and the probe is dry.

9.The probe needs to be cleaned.

10.The condition of the incoming metal has changed, i.e., temperature, cleanliness, speed.

11.The condition of the incoming water has changed, i.e., temperature, cleanliness, flow rate, hardness, pH.

12.Unauthorized personnel have tampered with the controller settings.

13.Standardizing procedure is not accurate due to a malfunctioning laboratory instrument or contami- nated chemical standard solutions.

WARNING

To prevent chemical feed into the process or injury to operating personnel, disconnect or disable the chemical feed pump and other external devices while you are servicing and troubleshooting the controller.

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Contents PH/ORP Hart Analyzer/Controller Model 54e pH/ORPEssential Instructions Electrical Shock HazardPage Model 54E PH/ORP Microprocessor Analyzer Description and SpecificationsSection Title List of Tables Appendix TitleTable No Title Table of Contents List of Figures About This DocumentGeneral Description Section Description and SpecificationsDescription of Controls Specifications Physical Specifications General PowerRelative Humidity 95%, non condensing Alarms Current OutputsAnalyzer Specifications @ 25C Recommended SensorsCode Options Ordering InformationPart NO. Description Section Installation Mechanical InstallationLocating the Controller Unpacking and InspectionPanel Mounting Section Wiring Power Input WiringAnalog Output Wiring Alarm Relay Output Wiring454EPH02 PH Sensor Compatibility PH Sensor WiringTions will Result in Controller MALFUNC- Tion 454EPH01 Cable Dressing Final Electrical Check Wiring to Model Section Calibration IntroductionAdjust temp 25.1 C Hold Mode OffTemperature Calibration Buffer 1 -- Wait Autocal bufferAutomatic TWO-POINT Calibration Use the arrow keys to select the correct buffer Auto buffer cal doneCalibration Notes Calibrate point Pt 04.00pH 25CPt calibration done Manual TWO-POINT CalibrationStandardize 7.01 pH SINGLE-POINT pH CalibrationTemperature Compensation Options Temp comp AutoOutput trim 59.16 mV/pHOutput trim Hold ModeTrim Outputs Section Software Configuration PH Settings ListRanges Factory Settings User Settings Diagnostics Section Outline of Menu Levels Alarm High 14.00pH Changing Alarm SetpointsSimulate tests Setpoint 07.00 pHSetpoint 7.00 pH 4mA 0.00 pH 20mA 2.00 pHSetpoint + 06.90 pH Changing Output Setpoints PID onlyOutput OutputMA 0.00 pH 20 mA 14.00 pH Output 1 12.00 mA MA +00.00 pHAlarm setpoints Output setpoints Test output Test alarmTesting Outputs and Alarms Simulated testsTest alarm 1 Open Test alarm 1 OpenDisplay right AL2 Measure pHDisplay contrast Timeout On Security CautionControl Mode DisplayChanging Output Parameters Output Control ParametersRange 4-20 mAl Fault 22.00 mARange 4-20 mA Fault 22.00mA Output 2 control Output 2 setupHold feature setup Hold Disable featureAlarm 3 control AlarmsInterval timer Alarm Low Setpoint 0.01 pH Delay 0 secHysteresis 0.01 pH Delay 0 sec Relay Default NoneRelay default None Setpoint +07.00 pHTime period 30 sec URV 2.00 pHAlarm Fault Feed limit DisableTimeout 3600 sec Alarm 4 SetupRecovery 600 sec Timer DisableOn time 120 sec Interval Timer Examples Diagnostics Off DiagnosticsZero offset 60 mV Diagnostics Auto Calibration SetupAutocal Standard Stabilize pH 0.01 pH Stabilize time 10 secAuto Calibration Setup Standard BuffersContinuous Sensor Diagnostics Section Theory of OperationTypical set points Interval TimerSee .8 for instructions on chang- ing these setpoints Alarm Relays Time Proportional Control TPC Mode CodeNormal Mode Analog OutputsController Mode Priority Controller Mode Priority ChartCondition Definitions Action DefinitionsPID Control Mode Combinations PID Control CodePID Control Measurement and Set Point Feedback ControlProportional Gain Plus Integral Reset Proportional Mode GainControl Loop Adjustment and Tuning Process Reaction Curve Method Process Reaction CurvePID Control Password Protection Section Special Procedures and FeaturesLevel 1 3 Password Privileges Configuring Security SecurityCustom Curve Lock allTemp coeff +.000 Solution Temperature CompensationSensor iso 07.00 pH Operate iso +07.00 pH Section Troubleshooting Troubleshooting is easy as 1, 2, 3…Diagnostic Messages Diagnostic Messages Description of problemQuick Troubleshooting Guide Symptom ActionDiagnostic Variables Theoretical pH vs. Millivolt Values at 25C 77F Troubleshooting Guidelines Temperature Compensation CircuitTroubleshooting Procedure Ohms Ambient TemperaturePreamp in a junction box Figure Preamplifier Troubleshooting ProcedureController preamp check Figure Junction Box Preamplifier Check Troubleshooting Guide No PowerCoated glass electrode Clean with soft cloth and clean water Password protected Replacement Parts Part Number DescriptionWarranty Repair NON-WARRANTY RepairSection Return of Material GeneralAppendix a ORP Configuration Quick Startup ORPTable A-1. ORP Settings List Item Choices ORP Settings User SettingsChoices ORP Settings User Settings Diagnostics SectionOutput setpoints Simulated testsStandardize 400 mV ORP CalibrationReturn of Materials Request Sensor or Circuit Board onlyWarranty Return of MaterialSpecifications subject to change without notice
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