CHAPTER 8 TROUBLESHOOTING CHAPTER8
Contents
1. Jcrarter 8 TROUBLESHOOTING 8 4 HE pr Calibration data error Meaning Action Operation at error This error is output only during temperature input and is displayed for two seconds when the power is turned ON Calibration data is in error E5AK T must be repaired Both control output functions and alarm output functions operate How ever note that readout accuracy is not assured Display range over Meaning Operation About Errors That Occur During Mo tor Calibration Though not an error this is displayed when the process value exceeds the display range when the control range setting range 10 is larger than the display range 1999 to 9999 e When less than 1999 eceec e When greater than 9999 a332 Control continues allowing normal operation If an error occurs during motor calibration Err is displayed on the No 2 display The following causes of errors are possible e Control motor or potentiometer malfunction e Incorrect control motor or potentiometer wiring e Potentiometer is not connected 8 3 How to Use the Error Output 8 3 How to Use the Error Output LBA Input errors A D converter error The E5AK T controller allows you to assign error output to terminals as outputs For details on output assignments see 3 3 Setting Output Specifications page 3 7 e LBA Loop Break Alarm can be used as a means for detecting loop breaks when the cont2. Action Operation at er ror Input is in error Check the wiring of inputs disconnections and shorts and check the in put type For control output functions the manipulated variable matched to the set ting of the MV at PV error parameter level 2 mode is output Alarm output functions are activated as if the upper limit is exceeded Program operation is continued E E Memory error Meaning Action Operation at er ror Internal memory operation is in error First turn the power OFF then back ON again If the display remains the same the E5AK T controller must be repaired If the display is restored to normal then a probable cause can be external noise affecting the con trol system Check for external noise Control output functions turn OFF 2 mA max at 4 to 20 mA output and output equivalent to 0 in case of other outputs Alarm output functions turn OFF 333 AD converter error Meaning Action Operation at error Internal circuits are in error First turn the power OFF then back ON again If the display remains the same the E5AK T controller must be repaired If the display is restored to normal then a probable cause can be external noise affecting the con trol system Check for external noise Control output functions turn OFF 2 mA max at 4 to 20 mA output and output equivalent to 0 in case of other outputs Alarm output functions turn OFF Program operation is stopped
3. CHAPTER 8 TROUBLESHOOTING ff CHAPTERS TROUBLESHOOTING This chapter describes how to find out and remedy the cause if the E5AK T does not function properly Remedy E5AK T trouble in the order of the descriptions in this chapter 8 1 Initial Checks s14s 00ctddseereetadys 8 2 8 2 How to Use the Error Display 8 3 8 3 How to Use the Error Output 8 5 8 4 Checking Operation Restrictions 8 6 PO 8 1 Initial Checks If trouble occurs first of all check the following 1 Power supply Make sure that the power supply is ON Also make sure that the pow er supply is within the rated voltage range 2 Wiring Make sure that all cables are properly connected 3 Communications conditions When communicating via the RS 232C RS 422 or RS 485 interfaces make sure that the baud rate and other communications condition settings on the host computer and E5AK T controller are matching and are within the permissible ranges If there appears to be nothing wrong after checking the E5AK T control ler and the same phenomenon continues check the controller in more de tail for example on the error display 8 2 How to Use the Error Display When an error has occurred the No 1 display alternately indicates error codes together with the current display item This section describes how to check error codes on the display and the ac tions you must take to remedy the problem Input error Meaning
4. OFF control control At ON OFF control x Manipulated variable MV change rate At AT execution MV change rate Parameter setting x Manipulated variable At reset g MV change rate Items marked by a x indicate combinations of conditions that are not acceptable during AT execu tion
5. rol loop is not functioning normally For details see page 4 26 e LBA allows you to detect the following errors 1 Heater burnout HBA 2 Output error contact weld damaged transistors etc 3 Sensor error constant input values etc e If you use the LBA function set the loop break detection time matched to the control characteristics in the LBA detection time parameter level 2 mode e If you assign error 1 as the output an error can be output to auxiliary output 1 or auxiliary output 2 when input is in error When this error occurs remedy by following the description for Input error e If you assign error 2 as the output an error can be output to auxiliary output 1 or auxiliary output 2 when the A D converter is in error When this error occurs remedy by following the description for A D converter error Jcrarter 8 TROUBLESHOOTING 8 4 Checking Operation Restrictions With the E5AK T controller auto tuning or self tuning sometimes do not operate depending on how functions are combined The table below sum marizes the main operating restrictions If the E5AK T controller is not operating properly first check whether op erating conditions violate the restrictions in this table Restriction Inoperable or Invalid Functions AT Execution Limitter Function Other At heating and cooling 40 AT control At position proportional 40 AT Manipulated variable ON
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