ABB AWT420 Operating Instruction

Also see for AWT420: Commissioning instructions Manual Manual

Contents

ABB AWT420 Operating Instruction Manual pdf 89 page image

AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B89RDO diagnosticsNAMURiconDiagnosticmessage Cause Recovery actionS(n):PT FailureThe measurement taken from the temperaturesensor is invalid indicating that thetemperature sensor has failed, or theassociated connections are either open-circuitor short-circuit.Visually inspect the sensor/temperature sensor for signs of damage.A damaged sensor must be replaced.Cycle power to the transmitter.If Process Temperature Failure persists, contact local serviceorganization.S(n):D.O ConcMeas ErrorThe RDO sensor cannot provide a validdissolved oxygen measurement due to a sensorerror.Power cycle sensor.If Dissolved Oxygen Concentration Measurement Error persists,contact local service organization.S(n):%Sat Meas ErrorThe RDO sensor cannot provide a valid %saturation measurement due to a sensor error.Power cycle sensor.If % Saturation Measurement Error persists, contact local serviceorganization.S(n):CalibratingSensor calibration is in progress. Diagnostic clears once calibration is complete.S(n):InternalComms ErrorThe RDO sensor cannot provide a validdissolved oxygen measurement due to an errorin the communication between sensor andsensor cap.Ensure that the sensor cap is installed and properly seated.S(n):Cap RemovedThe sensor cap has been removed from theRDO probe or is not being recognized.A valid measurement cannot be made withouta sensor capEnsure sensor cap is fitted correctly.S(n):Cal FailedThe most recent sensor calibration has failed,calibration coefficients have not been updatedand the previous values continue to be applied.Ensure that the sensor is clean and fully submerged in the solution.Repeat calibration, if Calibration Failed persists then considerreplacing the sensor.S(n):User Cal ExpiredRecalibration of the RDO sensor is required.The sensor deteriorates over time andrecalibration is required to maintain accuracy.Perform a calibration using ADS430205 RDO probe calibration kit.S(n):Factory CalExpiredRecalibration of the RDO sensor is required.The sensor deteriorates over time andrecalibration is required to maintain accuracy.Perform a calibration using ADS430205 RDO probe calibration kit.S(n):Sensor Warm-upThe RDO sensor is warming up and cannotprovide a valid dissolved oxygen measurementuntil the internal electronics have stabilized.Diagnostic clears once the internal electronics have stabilized.If Sensor Warm Up persists, contact local service organization.S(n):Sensor WarningPV measured from the RDO probe but does notmeet normal quality criteria.The sensor has sustained moderate damage, orthe recommended lifespan has been reached.Visually inspect the sensor for signs of damage.If the probe appears to be in good condition and is within itsrecommended lifespan, it may help to clean the sensor and the opticallens.If there are signs of damage or Sensor Warning persists, contact localservice organization.S(n):Cap ExpiredThe sensor cap within the RDO probe hasreached or exceeded its expiry date.The cap may continue to operate but itsaccuracy degrades and cannot be guaranteedto meet specification.Replace sensor cap using ADS430204 ABB RDO probe sensor capreplacement kit.S(n):Replace CapThe sensor cap within the RDO probe reachesits expiry date within 4 weeks.After its expiry date the cap may continue tooperate but its accuracy degrades and cannotbe guaranteed to meet specification.Replace sensor cap using ADS430204 ABB RDO probe sensor capreplacement kit.