Home

CHAPTER 8 TROUBLESHOOTING CHAPTER8

1. communications power not being supplied MS Module Status Indicates the status of the node itself NS Network Status Indicates the status of the network LED Lighting Specifications LED Status Meaning main error MS Lights green In this state the communications network and control are normal NS Lights green MS Lights green In this state the communications connection with the master is not estab NS Blinks green lished MS Lights green A time out has occurred in communications with the master or the com NS Blinks red munications power supply may not be supplied MS Lights green A duplicated node address error has occurred or BusOff communica NS Lights red tions stopped by frequently occurring data errors has been detected MS Lights red Unrecoverable fatal error has occurred NS Out If this trouble persists even after the E5EK DRT has been turned OFF and then ON again repair is necessary MS Blinks red A CompoBus D DeviceNet communications data assignment error has NS Current status occurred When a communications data assignment error occurs change the set tings using the keys on the front panel or a configurator The NS indicator indicates the current status and is controlled normally MS Out Power is not being supplied to the controller or the controller is reset NS Out The controller is not on line 8 2 How to Use the Error Display Whe
2. occurs while the remote SP function is enabled For details on error displays and meanings see Chapter 4 Applied Operation 4 3 How to Use the Remote SP page 4 7 When an error occurs check the state of the remote SP connection If the lead is broken or disconnected the remote SP scaling lower limit is dis played blinking on the PV SP display or remote SP monitor display RO 8 4 Checking Operation Restrictions With the E5SEK DRT controller auto tuning sometimes does not operate depending on the way functions are combined The table below summa rizes the main operating restrictions If the ESEK DRT controller is not operating properly first check whether operating conditions violate the restrictions in this table Inoperable or Invalid Functions Restriction AT Execution Limiter Function Other At heating and 40 AT cooling control impossible Execution Manipulated variable At ON OFF control impossible MV change rate At AT execution MV change rate Parameter setting At st Execution Manipulated variable stop impossible MV change rate
3. CHAPTER 8 TROUBLESHOOTING ff CHAPTERS TROUBLESHOOTING This chapter describes how to find out and remedy the cause if the E5EK DRT does not function properly 8 1 Initial Cheeks nnna 8 2 8 2 How to Use the Error Display 8 3 8 3 How to Use Error Output 8 5 8 4 Checking Operation Restrictions 8 6 RO 8 1 Initial Checks MS NS Indicator If trouble occurs first check items 1 to 3 Correct any problems you find according to the remedy described 1 Power supply Make sure that the power supply is ON Also make sure that the power supply is within the rated voltage range 2 Wiring Make sure that all cables are properly connected 8 Communication conditions e When CompoBus D DeviceNet is in use make sure that the node addresses and baud rate conditions match and that settings are within the specified ranges Make sure that communication data assignment communication data format operation at communication error and remote local selection are correctly set If as a result of checking or processing the trouble is not remedied check the details for example on the error display When communications is being performed successfully both the MS and NS indicators light green The E5EK DRT is equipped with a function for monitoring the commu nications power supply For this reason the MS lights green and NS blinks red when the E5EK DRT power is being supplied with the
4. n trol system Check for external noise Control output functions turn OFF 2mA max at 4 to 20mA output and output equivalent to 0 in case of other outputs Alarm output functions turn OFF b 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 Must repair Both control output functions and alarm output functions operate How ever note that readout accuracy is not assured Display range over Meaning Operation 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 ecce e When greater than 9999 a333 Control continues allowing normal operation C Eee Communications error Meaning Action Operation at error 8 4 The communications read write data assignment is in error This error occurs in the following instances e When the same data is set to two or more channels e When write only data is set to a read data assignment e When read only data is set to a write data assignment Check and reset the communications read write data assignment data in the option mode For details see 6 4 Data Assignments Control output functions turn OFF 2mA max at 4 to 20mA out
5. n 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 actions you must be taken to remedy the problem Input error Meaning Action Operation at error Input is in error Check the wiring of inputs disconnections and shorts and check the in put type For control output functions output the manipulated variable matched to the setting of the MV at PV error parameter level 2 mode Alarm out put functions are activated when the upper limit is exceeded ret E Memory error Meaning Action Operation at error Internal memory operation is in error First turn the power OFF then back ON again If the display remains the same the E5EK DRT 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 2mA max at 4 to 20mA output and output equivalent to 0 in case of other outputs Alarm output functions turn OFF 3433 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 E5EK DRT controller must be repaired If the display is restored to normal then a probable cause can be external noise affecting the co
6. put and output equivalent to 0 in case of other outputs Alarm output functions turn OFF 8 3 How to Use Error Output LBA Input errors A D converter error Remote SP input error The E5EK DRT 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 control loop is not functioning normally For details see page 4 11 e LBA allows you to detect the following errors 1 Heater burnout 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 page 8 3 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 page 8 3 If you assign error 3 as the output an error can be output to auxiliary output 1 or auxiliary output 2 when the remote SP input error

CHAPTER 8 TROUBLESHOOTING CHAPTER8

Contents

Download Pdf Manuals

Related Search

Related Contents