Chapter 6 TROUBLESHOOTING
Contents
1. 2 The acceleration deceleration time was too short Check that the motor generates enough torque for acceleration deceleration This torque is calculated from the moment of inertia for the load and the acceleration deceleration time gt Increase the acceleration deceleration time F07 F08 E10 E11 and H54 3 The characteristics of electronic thermal did not match those of the motor overload Check the motor characteristics gt Reconsider the data of function codes P99 F10 and F12 gt Use an external thermal relay 4 Activation level for the electronic thermal relay was inadequate Check the continuous allowable current of the motor gt Reconsider and change the data of function code F11 6 14 11 GL Overload protection Problem Temperature inside inverter rose abnormally Possible Causes What to Check and Suggested Measures 1 Temperature around the Measure the temperature around the inverter inverter exceeded that of inverter specifications gt Lower the temperature e g ventilate the panel well gt Lighten the load 2 The service life of the Check the cumulative running time of cooling fan Refer to cooling fan has expired or Chapter 3 Section 3 2 2 5 Reading Maintenance the cooling fan Information malfunctioned gt Replace the cooling fan Visually check that the cooling fan rotates normally gt Replace the cooling fan 3 Air vent2. gt Implement noise control measures For details refer to Appendix A of the FRENIC Mini User s Manual MEH446 gt Enable the retry function H04 6 9 2 Problem Gin Overvoltage protection HII LILI I IU 1 LILIT HIF LILII Possible Causes 1 The power supply voltage was over the range of the inverter s specifications The DC link bus voltage was over the detection level of overvoltage Overvoltage occurs during the acceleration Overvoltage occurs during the deceleration Overvoltage occurs during running at constant speed What to Check and Suggested Measures Measure the input voltage gt Decrease the voltage to within that of the specifications 2 The acceleration time was too short Check if the overvoltage alarm occurs after sudden acceleration gt Increase the acceleration time F07 E10 and H54 gt Select the S curve pattern H07 gt Consider the use of a braking resistor The deceleration time was too short for the moment of inertia for load Recalculate the deceleration torque from the moment of inertia for load and the deceleration time gt Increase the deceleration time F08 E11 and H54 gt Enable automatic deceleration H69 1 so that when the DC link bus voltage exceeds the overvoltage suppression level the inverter changes the deceleration time to three times longer than the set value gt Set the rated voltage at base frequency
3. Change the data of function code F14 Restart mode after momentary power failure mode selection to 4 or 5 2 The run command stayed off even after power has been restored Check the input signal with Menu 4 I O checking using the keypad gt Check the power recovery sequence with an external circuit If necessary consider the use of a relay that can keep the run command on 8 The inverter does not run as expected Possible Causes 1 Wrong configuration of function codes What to Check and Suggested Measures Check that all function codes are correctly configured gt Correct the configuration of the function codes Make a note of function code data currently configured and initialize all function code data H03 gt After initialization reconfigure the necessary function codes one by one checking the running status of the inverter 6 7 6 2 2 Problems with inverter settings 1 Data of function codes cannot be changed Possible Causes 1 An attempt was made to change function code data that cannot be changed when the inverter is running What to Check and Suggested Measures Check if the inverter is running with Menu 3 Drive monitoring using the keypad and then confirm whether the data of the function codes can be changed when the motor is running by referring to the function code tables gt Stop the motor then change the data of the function codes 2 The data
4. F05 to 0 to improve braking ability gt Consider the use of a braking resistor 4 Loads were suddenly removed Check if the alarm occurs when loads are suddenly removed Check if the inverter operation suddenly changes from driving operation to braking operation gt Consider the use of a braking resistor Braking load was too heavy Compare the braking torque of the load with that of the inverter gt Set the rated voltage at base frequency F05 to 0 to improve braking ability gt Consider the use of a braking resistor 3 Problem Malfunction caused by noise 11I Check if the DC link bus voltage was below the protective level when the alarm occurred gt Improve noise control For details refer to Appendix A of the FRENIC Mini User s Manual MEH446 gt Enable the retry function H04 Lv Undervoltage protection Possible Causes 1 A momentary power failure occurred DC link bus voltage was below the undervoltage detection level What to Check and Suggested Measures gt Reset the alarm gt If you want to restart running the motor by not treating this condition as an alarm set F14 to 4 or 5 depending on the load 6 10 Possible Causes 2 The power to the inverter was switched back on too soon with F14 1 What to Check and Suggested Measures Check with LED monitor if the power to the inverter was switched back on althoug
5. V and W terminals of the motor 2 Incorrect connection and settings for run commands and rotation direction command FWD and REV Check the data of function codes E98 and E99 and the connection to terminals FWD and REV gt Correct the data of the function codes and the connection 3 The setting for the rotation direction via keypad operation is incorrect Check the data of function code F02 Operation method gt Change the data of function code F02 to 2 forward rotation or 3 reverse rotation 6 5 4 If the speed variation and current vibration such as hunting occur at the constant speed Possible Causes 1 The frequency command fluctuated What to Check and Suggested Measures Check the signals for the frequency command with Menu 4 I O checking using the keypad gt Increase the filter constants C33 and C38 for the frequency command 2 The external frequency command device was used Check that there is no noise in the control signal wires from external sources gt Isolate the control signal wires from the main circuit wires as far as possible gt Use shielded or twisted wires for the control signal 3 The slip compensation gain was too large Check that the motor vibration is absorbed if the slip compensation P09 is cancelled gt Readjust the slip compensation value P09 or deactivate slip compensation altogether 4 The vibration
6. alarm function of the external equipment was activated External alarm was inputted THR What to Check and Suggested Measures Inspect external equipment operation gt Remove the cause of the alarm that occurred 2 Connection has been performed incorrectly Check if the wire for the external alarm signal is correctly connected to the terminal to which the Alarm from external equipment has been assigned gt Connect the wire for the alarm signal correctly 3 Incorrect settings Check if the Alarm from external equipment has not been assigned to an unassigned terminal gt Correct the assignment 8 GH PTC thermistor for motor protection Problem Possible Causes 1 Temperature around the motor exceeded that of motor specifications Temperature of the motor rose abnormally What to Check and Suggested Measures Measure the temperature around the motor gt Decrease the temperature gt Lighten the load 2 Cooling system for the motor malfunctioned Check if the cooling system of the motor is operating normally gt Repair or replace the cooling system of the motor 3 Load was too heavy Measure the output current gt Lighten the load e g lighten the load before overload occurs using the overload early warning E34 function gt Decrease the temperature around the motor gt Increase the motor sound carrier frequency F26 4 T
7. of the function codes is protected Check the data of function code F00 Data protection gt Change the setting of FOO from 1 to 0 The WE KP command Enable editing of function codes data from keypad is not input though it has been assigned to a digital input terminal Check the data of function codes E01 E02 E03 E98 and E99 and the input signals with Menu 4 I O checking using the keypad gt Change the setting of F00 from 1 to 0 or input a WE KP command through a digital input terminal DC link bus voltage was below the undervoltage detection level Check the DC link bus voltage with Menu 5 Maintenance information and measure the input voltage using the keypad gt Connect the inverter to a power supply that matches its input rating 2 The desired menu is not displayed Causes 1 3 The limiting menus function was not selected appropriately Check and Measures Check the data of function code E52 Menu display mode gt Change the data of function code E52 so that the desired menu can be displayed Nothing appears on the LED monitor Possible Causes 1 No power supplied to the inverter What to Check and Suggested Measures Check the input voltage output voltage and interphase voltage unbalance gt Connect a molded case circuit breaker an earth leakage circuit breaker with overcurrent protection or a magnetic contactor gt Check for
8. to Section 6 2 1 Problems with inverter settings Go to Section 6 2 2 If an alarm code appears on the LED monitor Go to Section 6 3 If an abnormal pattern appears on the LED Go to Section 6 4 monitor while no alarm code is displayed If any problems persist after the above recovery procedure contact your Fuji Electric representative 6 1 E Quick reference table of alarm codes Alarm code Overcurrent protection LILI PTC thermistor for motor LUT T protection Overheat protection for braking resistor Electronic thermal overload relay Overvoltage protection Overload protection Memory error Remote keypad communications error Undervoltage protection CPU error Input phase loss protection Operation protection Output phase loss protection RS 485 communications error Overheat protection for heat sink Data save error during Note An under bar _ _ External alarm input command is present while the setting o selection is not 0 undervoltage _ _ will be displayed when an undervoltage condition is detected and a run F14 Restart mode after momentary power failure function 6 2 If No Alarm Code Appears on the LED Monitor 6 2 1 Motor is running abnormally 1 The motor does not rotate Possible Causes 1 No power supplied to the inverter What to Check and Suggested Measures Check the input voltage output
9. 2 Make sure that when you wish to view a PID process command or a PID control command PID control is still in effect or J01 is not set to 0 gt Set J01 to 1 or 2 2 While timer operation is disabled C21 0 E43 item selection has been set for 10 or 12 While timer operation is enabled C21 1 it has been disabled C21 0 during setting the LED monitor to display the timer value by pressing the S key Make sure that when you wish to view other monitor items E43 is not set to 13 gt Set E43 to a value other than 13 Make sure that when you wish to view the timer s timer operation is still in effect or C21 is not set to 0 gt Set C21 to 1 3 Connection to the remote keypad was broken Prior to proceed check that pressing the key does not take effect for the LED display Check connectivity of the cable for the remote keypad gt Replace the cable Check whether the connector on the RS 485 Communications Card or on the remote keypad is not broken gt Replace the RS 485 Communications Card or the remote keypad with a new one 6 19 2 ____ under bar appears Problem An under bar _____ appeared on the LED monitor when you pressed the 8 key or entered a normal start stop command FWD or a reverse start stop command REV The motor did not start Possible Causes What to Check and Suggested Measures 1 The voltage of the DC link Select 5_ under Menu 5 Reading ma
10. 50 and F51 is also required 2 The deceleration time was too short Recalculate the required deceleration torque and time from the moment of inertia for the load and the deceleration time gt Increase the deceleration time F08 E11 and H54 gt Reconsider the choice of the braking resistor in order to improve the braking ability Resetting the data of function codes F50 and F51 is also required 3 Incorrect values have been set for the data of function codes F50 and F51 Check the braking resistor specifications gt Reconsider and change the data of function codes F50 and F51 Note The inverter does not detect the overheating alarm of a braking resistor by monitoring its surface temperature but by monitoring its load magnitude Therefore even if the surface temperature itself does not rise the alarm may be detected if the resistor is used more frequently than the set data of function codes F50 and F51 If you use the resistor to the limit of its capacity you must adjust the data of function codes F50 and F51 while checking the surface temperature of the resistor 10 Electronic thermal overload relay Problem Electronic thermal function for motor overload detection was activated Possible Causes 1 Load was too heavy What to Check and Suggested Measures Measure the output current gt Lighten the load e g lighten the load before overload occurs using the overload early warning E34
11. Chapter6 TROUBLESHOOTING 6 1 Before Proceeding with Troubleshooting A WARNING If any of the protective functions have been activated first remove the cause Then after checking that the all run commands are set to off reset the alarm Note that if the alarm is reset while any run commands are set to on the inverter may supply the power to the motor which may cause the motor to rotate Injury may occur Electric shock may occur Even though the inverter has interrupted power to the motor if the voltage is applied to the main circuit power input terminals L1 R L2 S and L3 T L1 L and L2 N for single phase voltage input voltage may be output to inverter output terminals U V and W Some electric charge may remain in the DC link bus capacitor even after the power is turned off Therefore it may take some time until the DC link bus voltage reaches a safe level Before touching the circuit wait for at least five minutes after the power has been turned off and check that the DC voltage between main circuit terminals P and N is less than 25 VDC using a multimeter Follow the procedure below to solve problems 1 First check that the inverter is correctly wired referring to Chapter 2 Section 2 3 5 Wiring for Main Circuit Terminals and Grounding Terminals 2 Check whether an alarm code is displayed on the LED monitor If no alarm code appears on the LED monitor Motor is running abnormally Go
12. attempted was active and the run command was stopped While referring to the block diagram of the drive command generator check the higher priority run command with Menu 2 Data checking and Menu 4 I O checking using the keypad Refer to the FRENIC Mini User s Manual MEH446 Chapter 4 gt Correct any incorrect function code data settings e g cancel the higher priority run command 6 The reference frequency was set below the starting or stop frequency Check that a frequency command has been entered with Menu 4 I O checking using the keypad gt Set the value of the frequency command to the same or higher than that of the starting or stop frequency F23 or F25 gt Reconsider the starting and stop frequencies F23 and F25 and if necessary change them to lower values gt Inspect the frequency command devices signal converters switches or relay contacts Replace any ones that are faulty gt Connect the external circuit wires correctly to terminals 13 12 11 and C1 6 3 Possible Causes 7 A frequency command with higher priority than the one attempted was active What to Check and Suggested Measures Check the higher priority run command with Menu 2 Data checking and Menu 4 I O checking using the keypad referring to the block diagram of the drive command generator Refer the FRENIC Mini User s Manual MEH446 Chapter 4 gt Correct any incorrect fu
13. een connected gt Single phase motors cannot be used Note that the FRENIC Mini only drives three phase induction motors 6 GH4 Overheat protection for heat sink Problem Possible Causes 1 Temperature around the inverter exceeded that of inverter specifications Temperature around heat sink rose What to Check and Suggested Measures Measure the temperature around the inverter gt Lower the temperature around the inverter e g ventilate the panel well gt Lighten the load 2 Accumulated running time of the cooling fan exceeded the standard period for replacement or the cooling fan malfunctioned Check the cumulative running time of the cooling fan Refer to Chapter 3 Section 3 2 2 5 Reading Maintenance Information gt Replace the cooling fan Visually check that the cooling fan rotates normally gt Replace the cooling fan 3 Air vent is blocked Check if there is sufficient clearance around the inverter gt Increase the clearance Check if the heat sink is not clogged gt Clean the heat sink 4 Load was too heavy Measure the output current gt Lighten the load e g lighten the load before the overload protection occurs using the overload early warning E34 gt Decease the motor sound carrier frequency F26 gt Enable the overload protection control H70 6 12 7 Gb External alarm input Problem Possible Causes 1 An
14. eleration deceleration time was too long Check the data of function codes F07 F08 E10 E11 and H54 gt Change the acceleration deceleration time to match the load 6 Overload Measure the output current gt Lighten the load e g operate the mechanical brake correctly Check if mechanical brake is working gt Release the mechanical brake 7 The current limiting operation did not increase the output frequency Make sure that F43 Current limiter mode selection is set to 2 and check the setting of F44 Current limiter level gt Readjust the setting of F44 or disable the function of current limiting in F43 Decrease the value of torque boost F09 then turn the power off and back on again and check if the speed increases gt Adjust the value of the torque boost F09 Check the data of function codes F04 F05 H50 and H51 to ensure that the V f pattern is right gt Match the V f pattern values with the motor ratings 8 Bias and gain set incorrectly Check the data of function codes F18 C50 C32 C34 C37 and C39 gt Readjust the bias and gain to appropriate values 3 The motor runs in the opposite direction to the command Possible Causes 1 Wiring has been connected to the motor incorrectly What to Check and Suggested Measures Check the wiring to the motor gt Connect terminals U V and W of the inverter to the respective U
15. ency currently specified was 00 gt Readjust the data of the maximum frequency F03 2 The data of frequency Check the data of function code F15 Frequency limiter high limiter currently specified Ela gt Readjust the setting of F15 3 The reference frequency Check the signals for the frequency command from the control currently specified was too low circuit terminals with Menu 4 I O checking using the keypad gt Increase the frequency of the command gt If an external potentiometer for frequency command signal converter switches or relay contacts are malfunctioning replace them gt Connect the external circuit wires to terminals 13 12 11 and C1 correctly 6 4 Possible Causes 4 A frequency command with higher priority than the one attempted e g multi frequency communications or jogging operation etc was active and the reference frequency was set to too low a value What to Check and Suggested Measures Check the settings data of the relevant function codes and what frequency commands are being received through Menu 1 Data setting Menu 2 Data checking and Menu 4 I O checking using the remote keypad and referring to the block diagram of the frequency setting circuit Refer to the FRENIC Mini User s Manual MEH446 Chapter 4 gt Correct any incorrect function code data settings e g cancel higher priority run commands etc 5 The acc
16. h its control circuit was still operating gt Make the interval longer for re power on 3 The power supply voltage did not reach the range of the inverter s specifications Measure the input voltage gt Increase the voltage to within that of the specifications 4 Peripheral equipment for the power circuit malfunctioned or the connection was incorrect Measure the input voltage to find where the peripheral equipment malfunctioned or which connection is incorrect gt Replace any faulty peripheral equipment or correct any incorrect connections 5 Other loads were connected to the same power system and required a large current to start running to the extent that it caused a temporary voltage drop on the supply side Measure the input voltage and check the voltage variation gt Reconsider the power system configuration 6 4 Problem Inverter s inrush current caused the power voltage drop because power transformer capacity was insufficient 1 Possible Causes 1 Main circuit power input wires broken Check if the alarm occurs when you switch on a molded case circuit breaker an earth leakage circuit breaker with overcurrent protection or a magnetic contactor gt Reconsider the capacity of the power transformer m Input phase loss protection Input phase loss occurred or interphase voltage unbalance rate was large What to Check and Suggested Mea
17. he remote keypad malfunctioned Check that alarm does not occur if you connect another remote keypad to the inverter gt Replace the remote keypad 4 The RS 485 communications card Check that alarm 4 occurs even if you connect another remote keypad to the inverter malfunctioned gt Replace the card 14 E J CPU error Problem A CPU error e g erratic CPU operation occurred Possible Causes 1 A high intensity noise was given to the inverter What to Check and Suggested Measures Check if appropriate noise control measures have been implemented e g correct grounding and routing of control and main circuit wires gt Improve noise control 6 16 15 amp amp Operation protection Problem An error occurred due to incorrect operation of the motor Possible Causes 1 The key was pressed when H96 1 or 3 What to Check and Suggested Measures Even though a run command was present at the input terminal or the communication port the inverter was forced to decelerate to stop and 4 4 was displayed gt If this was not intended check the setting of H96 2 The start check function was activated when H96 2or3 When one of the following conditions occurred while a run command was present at the input the inverter did not run and Ei was displayed The power was switched on An alarm was released The inverter was switched to link command LE operation gt Rev
18. he set activation level H27 of the PTC thermistor for motor overheat protection was inadequate Check the thermistor specifications and recalculate the detection voltage gt Reconsider the data of function code H27 5 APTC thermistor and pull up resistor were connected incorrectly or the resistance was inadequate Check the connection and the resistance of the pull up resistor gt Correct the connections and replace the resistor with one with an appropriate resistance 6 The value set for the torque boost F09 was too high Check the data of function code F09 and readjust the data so that the motor does not stall even if you set the data to a lower value gt Readjust the data of the function code F09 7 The V f pattern did not match the motor Check if the base frequency F04 and rated voltage at base frequency F05 match the values on the nameplate on the motor gt Match the function code data to the values on the nameplate of the motor 6 13 9 cH Overheat protection for braking resistor Problem Thermal protection for braking resistor activated Possible Causes 1 Braking load was too heavy What to Check and Suggested Measures Recalculate the relation between the braking load and braking capacity gt Lighten the braking load gt Reconsider the choice of the braking resistor in order to improve braking ability Resetting the data of function codes F
19. high intensity noise was given to the inverter while data especially initializing data was being written What to Check and Suggested Measures Check if appropriate noise control measures have been implemented e g correct grounding and routing of control and main circuit wires Also perform the same check as described in 1 above gt Improve noise control Alternatively return the initialized function code data to their previous settings then restart the operation 3 The control circuit failed Initialize the function code data by setting HO3 to 1 then reset the alarm by pressing the key and check that the alarm goes on gt This problem was caused by a problem of the printed circuit board PCB on which the CPU is mounted Contact your Fuji Electric representative 13 E e Remote keypad communications error Problem A communications error occurred between the remote keypad and the inverter Possible Causes 1 Break in the communications cable or poor contact What to Check and Suggested Measures Check continuity of the cable contacts and connections gt Replace the cable 2 A high intensity noise was given to the inverter Check if appropriate noise control measures have been implemented e g correct grounding and routing of control and main circuit wires gt Improve noise control For details refer to Appendix A of the FRENIC Mini User s Manual MEH446 3 T
20. iew the running sequence to avoid input of the run command when 4 has occurred If this was not intended check the setting of H96 To reset the alarm turn the run command off 16 amp amp RS 485 communications error Problem A communications error occurred during RS 485 communications Possible Causes 1 Host controllers e g PLCs and personal computers did not operate due to incorrect settings and or defective software hardware What to Check and Suggested Measures Check the controllers gt Remove the cause of the controller error 2 RS 485 converter did not operate due to incorrect connections and settings or hardware defective Check the RS 485 converter e g check for poor contact gt Change the various RS 485 converter settings reconnect the wires or replace the converter with a recommended device as appropriate 3 Broken communications cable or poor contact Check continuity of the cable contacts and connections gt Replace the cable 4 Even though no response error detection time y08 has been set communications did not occur cyclically Check the host controllers gt Change the settings of host controller software or make the no response error detection time invalid yO8 0 5 A high intensity noise was given to the inverter Check if appropriate noise control measures have been implemented e g correct grounding and routing of control and
21. igh intensity noise Check if appropriate noise control measures have been affected the operation of implemented e g correct grounding and routing of control the inverter while data was and main circuit wires being saved when the i power was turned off gt Improve noise control After pressing the key and releasing the alarm set using a remote keypad the data of the relevant function codes such as the frequency commands timer operation time and PID process command back to the original values and then restart the operation 3 The control circuit failed Check if occurs each time power is switched off gt This problem was caused by a problem of the printed circuit board PCB on which the CPU is mounted Contact your Fuji Electric representative 6 18 6 4 1 Problem If an Abnormal Pattern Appears on the LED Monitor while No Alarm Code is Displayed center bar appears Possible Causes 1 When PID control had been disabled J01 0 you changed E43 item selection to 10 or 12 You disabled PID control J01 0 when the LED monitor had been set to display the PID final command value or PID feedback amount by pressing the S key A center bar has appeared on the LED monitor What to Check and Suggested Measures Make sure that when you wish to view other monitor items E43 is not set to 10 or 12 gt Set E43 to a value other than 10 or 1
22. intenance bus was low F14 4 5 information in Programming mode on the keypad and check the voltage of the DC link bus which should be 200 VDC or below for three phase 200 V single phase 200 V and single phase 100 V and 400 VDC or below for three phase 400 V gt Plug the inverter to a power supply that meets its input specifications 3 Jappears Problem Parentheses J has appeared on the LED monitor while the keypad displaying the Drive Monitor Possible Causes 1 The data to be displayed could not fit the LED monitor What to Check and Suggested Measures Check that the product of the output frequency and the display coefficient E50 does not exceed 9999 gt Adjust the setting of E50 6 20
23. is blocked Check if there is sufficient clearance around the inverter gt Increase the clearance Check if the heat sink is not clogged gt Clean the heat sink 4 Load was too heavy Measure the output current gt Lighten the load e g lighten the load before overload occurs using the overload early warning E34 gt Decrease the motor sound carrier frequency F26 gt Enable overload prevention control H70 5 The acceleration Recalculate the required acceleration deceleration torque and deceleration time was too time from the moment of inertia for the load and the short deceleration time gt Increase the acceleration deceleration time F07 F08 E10 E11 and H54 6 The wires to the motor are Measure the leak current too long and caused a gt Insert an output circuit filter OFL large amount of current to leak from them 12 E Memory error Problem Error occurred in writing the data to the memory in the inverter Possible Causes What to Check and Suggested Measures 1 While the inverter was writing data especially initializing data power supply was turned off and the voltage for the control circuit dropped Check if pressing the key resets the alarm after the function code data are initialized by setting the data of H03 to 1 gt Return the initialized function code data to their previous settings then restart the operation 6 15 Possible Causes 2 A
24. main circuit wires gt Improve noise control gt Improve noise reduction measures on the host side gt Replace the relay converter with a recommended insulated converter 6 17 Possible Causes 6 Conditions for communications differ between the inverter and host controllers What to Check and Suggested Measures Compare the settings of the y codes y01 to y10 with those of the host controllers gt Correct any settings that differ The RS 485 communications card malfunctioned gt Replace the card 17 amp F Data save error during undervoltage Problem The inverter was unable to save data such as the frequency commands timer operation time and PID process command set through the keypad when the power was switched off Possible Causes 1 The control circuit voltage dropped suddenly while data was being saved when the power was turned off because the DC link bus was rapidly discharged What to Check and Suggested Measures Check how long it takes for the DC link bus voltage to drop to the preset voltage when power is turned off gt Remove whatever is causing the rapid discharge of the DC link circuit After pressing the key and releasing the alarm set using a remote keypad the data of the relevant function codes such as the frequency commands timer operation time and PID process command back to the original values and then restart the operation 2 A h
25. nction code data settings e g cancel the higher priority run command The peak and bottom frequencies for the frequency limiters were set incorrectly Check the data of function codes F15 frequency limiter high and F16 frequency limiter low gt Change the settings of F15 and F16 to the correct ones The coast to stop command was effective Check the data of function codes E01 E02 E03 E98 and E99 and the input signal status with Menu 4 I O checking using the keypad gt Release the coast to stop command setting 10 Broken wire incorrect connection or poor contact with the motor Check the cabling and wiring Measure the output current gt Repair the wires to the motor or replace them 11 Overload Measure the output current gt Lighten the load Check that a mechanical brake is in effect gt Release the mechanical brake if any 12 Torque generated by the motor was insufficient Check that the motor starts running if the value of torque boost F09 is increased gt Increase the value of torque boost F09 and try to run the motor Check the data of function codes F04 F05 H50 and H51 gt Change the V f pattern to match the motor s characteristics 2 The motor rotates but the speed does not increase Possible Causes What to Check and Suggested Measures 1 The maximum frequency Check the data of function code F03 Maximum frequ
26. sures Measure the input voltage gt Repair or replace the wires 2 The terminal screws for the main circuit power input of the inverter were not tight enough Check if the screws on the inverter input terminals have become loose gt Tighten the terminal screws to the recommended torque 3 Interphase unbalance rate of three phase voltage was too large Measure the input voltage gt Connect an AC reactor ACR or a DC reactor DCR to lower the rate gt Raise the inverter capacity 4 Overload cyclically occurred Measure ripple wave of DC link bus voltage gt If the ripple is large raise the inverter capacity 5 Single phase voltage was inputted to the inverter instead of three phase voltage input Check the inverter type gt Obtain a new inverter that meets the power supply specifications 6 11 5 JG Output phase loss protection Problem Possible Causes 1 Inverter output wires are broken Output phase loss occurred What to Check and Suggested Measures Measure the output current gt Replace the output wires 2 Wire for motor winding are broken Measure the output current gt Replace the motor 3 The terminal screws for inverter output were not tight enough Check if any screw on the inverter output terminals has become loose gt Tighten the terminal screws to the recommended torque 4 A single phase motor has b
27. system having low stiffness in a load caused hunting or the current is irregular due to special motor constants Cancel the automatic control system automatic torque boost slip compensation energy saving operation overload prevention control current limiting and check that the motor vibration is suppressed F37 P09 H70 and F43 gt Cancel the functions causing the vibration gt Readjust the data of the oscillation suppression gain H80 currently set to appropriate values Check that the motor vibration is suppressed if you decrease the level of the motor sound carrier frequency F26 or set the motor sound tone to 0 F27 0 gt Decrease the carrier frequency F26 or set the sound tone to 0 F27 0 5 If grating sound can be heard from motor Possible Causes 1 The carrier frequency was set too low What to Check and Suggested Measures Check the data of function codes F26 Motor sound carrier frequency and F27 Motor sound tone gt Increase the carrier frequency F26 gt Readjust the setting of F27 to appropriate value 6 The motor does not accelerate and decelerate at the set time Possible Causes 1 The inverter ran the motor by S curve or curvilinear pattern What to Check and Suggested Measures Check the data of function code HO7 Acceleration deceleration pattern gt Select the linear pattern H07 0 2 The current limiting prevented the outpu
28. t frequency from increasing Make sure that F43 Current limiter mode selection is set to 2 and check that the setting of F44 Current limiter level is reasonable gt Readjust the setting of F44 to appropriate value or disable the function of current limiting in F43 gt Increase the acceleration deceleration time F07 F08 E10 and E11 6 6 Possible Causes 3 The automatic deceleration was active What to Check and Suggested Measures Check the data of function code H69 Automatic deceleration mode selection gt Consider the use of a braking resistor gt Increase the deceleration time F08 and E11 4 Overload Measure the output current gt Lighten the load 5 Torque generated by the motor was insufficient Check that the motor starts running if the value of the torque boost F09 is increased gt Increase the value of the torque boost F09 6 An external frequency command device is being used Check that there is no noise in the external signal wires gt Isolate the control signal wires from the main circuit wires as far as possible gt Use shielded wire or twisted wire for the control signal wires 7 Even if the power recovers after a momentary power failure the motor does not restart Possible Causes 1 The setting of function code F14 is either 0 or 1 What to Check and Suggested Measures Check if an undervoltage trip occurs gt
29. terminals and motor 3 Loads were too heavy Measure the motor current with a measuring device and to trace the current trend Therefore use this information to judge if the trend is over the calculated load value for your system design gt If the load is too heavy decrease it or raise the inverter capacity Trace the current trend and check if there are any sudden changes in the current gt If there are any sudden changes make the load variation smaller or raise the inverter capacity gt Enable instantaneous overcurrent limiting H12 1 4 The value set for torque boost F09 was too large F37 0 1 3 or 4 Check that the output current decreases and the motor does not come to stall if you set a lower value than the current one for F09 gt Lower the value for torque boost F09 if the motor is not going to stall 5 The acceleration deceleration time was too short Check that the motor generates enough torque required during acceleration deceleration That torque is calculated from the moment of inertia for the load and the acceleration deceleration time gt Increase the acceleration deceleration time F07 F08 E10 E11 and H54 gt Enable current limiting F43 gt Raise the inverter capacity 6 Malfunction caused by noise Check if noise control measures are appropriate e g correct grounding and routing of control and main circuit wires
30. voltage and interphase voltage unbalance gt Turn on a molded case circuit breaker an earth leakage circuit breaker with overcurrent protection or a magnetic contactor gt Check for voltage drop phase loss poor connections or poor contacts and fix them if necessary 2 No forward reverse operation command was inputted or both the commands were inputted simultaneously external signal operation Check the input status of the forward reverse command with Menu 4 I O checking using the keypad gt Input a run command gt Set either the forward or reverse operation command to off if both commands are being inputted gt Correct the assignment of commands FWD and REV to function codes E98 and E99 gt Connect the external circuit wires to control circuit terminals FWD and REV correctly 3 No indication of rotation direction keypad operation Check the input status of the forward reverse rotation direction command with Menu 4 I O checking using the keypad gt Input the rotation direction F02 0 or select the keypad operation with which the rotation direction is fixed F02 2 or 3 4 The inverter could not accept any run commands from the keypad since it was in Programming mode Check which operation mode the inverter is in using the keypad gt Shift the operation mode to Running mode and enter a run command 5 Arun command with higher priority than the one
31. voltage drop phase loss poor connections or poor contacts and fix them if necessary 2 The power for the control circuit did not reach a high enough level Check if the jumper bar has been removed between terminals P1 and P or if there is poor contact between the jumper bar and the terminals gt Connect the jumper bar to terminals P1 and P or tighten the screws Or connect a DC reactor gt Replace the inverter if it is malfunctioning 6 8 6 3 1 Problem If an Alarm Code Appears on the LED Monitor Ln Overcurrent protection my I at wW I tA FET LiL I Possible Causes 1 The inverter output terminals were short circuited The inverter output current momentarily exceeded the overcurrent level Overcurrent occurred during acceleration Overcurrent occurred during deceleration Overcurrent occurred when running at a constant speed What to Check and Suggested Measures Remove the wires connected to the inverter output terminals U V and W and measure the interphase resistance Check if the resistance is too low gt Remove the part that short circuited including replacement of the wires relay terminals and motor 2 Ground faults occurred at the inverter output terminals Remove the wires connected to the inverter output terminals U V and W and perform a Megger test gt Remove the part that short circuited including replacement of the wires relay
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