Fuji FRENIC-VG Drive Fault Codes List:
| Fault Code | Cause & Solution |
|---|---|
| dba Braking transistor error | Cause: A braking transistor error is detected. – The braking transistor is broken. Solution: – Check whether resistance of the braking resistor is correct or there is a misconnection of the resistor. |
| dbh Braking resistor overheated | Cause: Problem The electronic thermal protection for the braking resistor has been activated. Solution: 1. Braking load is too heavy. Reconsider the relationship between the estimated braking load and the real one. – Lower the real braking load. – Review the selection of the braking resistor and increase the braking capability (Modification of related function code data (E35, E36, E37) is also required.) 2. Specified deceleration time is too short. Recalculate the deceleration torque and time needed for the load currently applied, based on a moment of inertia for the load and the deceleration time. – Increase the deceleration time (F08, C36, C47, C57, C67). – Review the selection of the braking resistor and increase the braking capability. (Modification of related function code data (E35, E36, E37) is also required.) 3. Incorrect setting of function code data (E35, E36, E37). Recheck the specifications of the braking resistor. – Review data of function codes E35, E36 and E37, then modify them |
| dcf Fuse blown | Cause: The fuse inside the inverter blew. (Applicable to the inverters of 75 kW or above (200 V class series) and those of 90 kW or above (400 V class series)) Solution: 1. The fuse blew due to short-circuiting inside the inverter. Check whether there has been any excess surge or noise coming from outside. – Take measures against surges and noise. 2. The fuse blew due to ground faults that have occurred at the inverter output lines. Disconnect the wiring from the output terminals [U], [V] and [W] and perform a Megger test for the inverter and the motor. – Remove the grounded parts (including replacement of the wires, relay terminals and motor). 3. Miswiring of main circuit power lines and output lines. – Check the wiring. |
| dfa DC fan locked | Cause: The DC fan has stopped. (Applicable to the inverters of 45 kW or above (200 V class series) and those of 75 kW or above (400 V class series)) – The service life of the DC fan has expired or the DC fan is defective. Solution: – The DC fan has stopped although the main power is ON. (Check the DC fan state with the cooling fan ON/OFF control disabled with H06 = 0.) – Replace the DC fan. – Disable the DC fan locked signal output (treat it as a light alarm) to keep the inverter running by setting “1” to the hundreds digit of H108 (Light alarm object definition) to “1” (H108 = 1). – If the DC fan has stopped, replace the fan immediately and revert the data of H108 to the factory default. Leaving the DC fan stopped causes an inverter internal overheat trip or a local temperature rise that shortens the service life of electrolytic capacitors and other electronic devices on the printed circuit boards in the inverter unit, in the worst case, it results in a broken inverter unit. |
| d0/dO Excessive positioning deviation | Cause: An excessive positioning deviation has occurred. Solution: 1. Wrong wiring to the motor. Check the wiring to the motor. – Connect the inverter output terminals U, V, and W to the motor input terminals U, V, and W, respectively. – It is also possible to use H75 (Phase sequence configuration of main circuit output wires). 2. The motor cannot rotate mechanically. – Check whether the brake is applied. 3. Output torque too small. – Increase the torque limiter value (F44, F45). 4. Deviation override width too small. – Review the deviation override width (o18). 5. Insufficient gain in positioning control system. – Readjust the positioning loop gain (o16). 6. The acceleration/ deceleration by pulse train command is too rapid. – Increase the acceleration/deceleration time |
| EF Ground fault | Cause: A ground fault current flew from the output terminal of the inverter. Solution: 1. Inverter output terminal(s) grounded (ground fault). – Disconnect the wiring from the output terminals [U], [V] and [W] and perform a Megger test for the inverter and the motor. – Remove the grounded parts (including replacement of the wires, relay terminals and motor). 2. The setting of the motor rated current (P04, A03, A103) is small relative to the inverter rated current. – Check whether an extremely small motor rated current is set relative to the inverter rated current. – Check the setting of the motor rated current (P04, A03, A103). – Disable the ground fault detection by setting “0” to the hundreds digit of H103 (Protection/maintenance function 1). |
| Er1 Memory error | Cause: Error occurred in writing data to the memory in the inverter. Solution: 1. When writing data (especially initializing or copying data), the inverter was shut down so that the voltage to the control PCB has dropped. – Initialize the function code data by setting H03 to “1.” After initialization, check if pressing the key releases the alarm. – Revert the initialized function code data to their previous customized settings (See Note below), then restart the operation. 2. Inverter affected by strong electrical noise when writing data (especially initializing or copying data). – 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. – Implement noise control measures. Revert the initialized function code data to their previous customized settings (See Note below), then restart the operation. 3. Control circuit failure. [Sub code: 0001 to 0008] – Initialize the function code data by setting H03 to “1,” then reset the alarm by pressing the key and check that the alarm goes on. – The control PCB (on which the CPU is mounted) is defective and needs to be replaced. 4. Highly-frequent rewriting to the non-volatile memory has reached the limit of the electronic device (approx. 1,000,000 times). [Sub code: 0001 to 0008] – Function code data has been frequently changed. – The non-volatile memory needs to be replaced. – Decrease the frequency of rewriting. Decrease the frequency of full save operations. |
| Er2 Keypad communications error | Cause: A communications error occurred between the keypad and the inverter. Solution: 1. Broken communications cable or poor contact. [Sub code: 0001] – Check continuity of the cable, contacts and connections. – Re-insert the connector firmly. – Replace the cable. 2. Connecting many control wires hinders the front cover from being mounted, lifting the keypad. [Sub code: 0001] – Check the mounting condition of the front cover. – Use wires of the recommended size (0.75 mm2) for wiring. – Change the wiring layout inside the unit so that the front cover can be mounted firmly 3. A keypad failure occurred. Replace the keypad with another one and check whether a keypad communications error ( er2 ) occurs. – Replace the keypad. 4. A keypad designed for any other series of inverters is connected. – Check whether the connected keypad is a multi-function keypad designed for FRENIC-Mini/-Eco/-Multi/-MEGA/-Lift. – Replace the keypad with the one designed for the FRENIC-VG |
| Er3 CPU error | Cause: A CPU error (e.g. erratic CPU operation) occurred. Solution: 1. Inverter affected by strong electrical noise. – Check if appropriate noise control measures have been implemented (e.g. correct grounding and routing of signal wires, communications cables, and main circuit wires). – Implement noise control measures. 2. Short circuit on the printed circuit board(s). [Sub code: 0001 to 0008] – Check the printed circuit board(s) for short circuits, accumulation of dust or dirt. |
| Er4 Network error | Cause: The connected option card detected an error. Solution: For T-Link option 1. The power to the MICREX IO terminal is OFF. – Check the power to the MICREX IO terminal. – Turn ON the power to the MICREX IO terminal and reset the inverter alarm state. 2. T-Link address double assigned. -Check the T-Link address. – Set a new T-Link address. 3. Wrong wiring. Check that: – The T-Link network has a terminating resistor at each end. – The specified cable is used. – There is no wire break. – The wiring length is within the range of the specification. – The shielded wires are properly treated. – The SD terminal of the T-Link is not connected to a frame ground (FG). – A crimp terminal is used for connection. – The signal lines are not wired in parallel with the power lines. – Correct the wiring. For SX-bus option 1. he SX-bus power is shut down or the PLC’s CPU module is down. – Check the power to the SX-bus and the status of the PLC’s CPU module. – Turn ON the power to the SX-bus, recover the PLC’s CPU module, and reset the inverter alarm state. 2. An error has occurred at any other station. – Check the detailed RAS information on the PLC’s CPU module to find a faulty station. – Recover the faulty station and reset the inverter alarm state. 3. Wrong wiring. Check that: – The SX-bus network has a terminating connector at each end. – A dedicated cable is used. – There is no wire break. – Connection to the IN and OUT connector is proper. – The signal lines are not wired in parallel with the power lines. – The total extension length of the SX bus cable does not exceed 25 m. Thenumber of devices connected in succession does not exceed 10. – The SX bus cable is not bent with the bend radius of 50 mm or below. – Correct wiring. For CC-Link option 1. The power to the PLC is shut down or the PLC’s CPU module is down. – Check the power to the PLC and the status of the PLC’s CPU module. – Turn ON the power to the PLC, recover the PLC’s CPU module, and reset the inverter alarm state. 2. An error has occurred at any other station. – Check the detailed RAS information on the PLC’s CPU module to find a faulty station. – Recover the faulty station and reset the inverter alarm state. 3. Wrong wiring. Check that: – The CC-Link network has a terminating resistor at each end. – A dedicated cable is used. – There is no wire break. – Connection to the terminal block is proper. – The signal lines are not wired in parallel with the power lines. – The maximum cable length of the CC-link cable, inter-station cable length, and the number of devices connected are as specified. – Correct wiring. |
| Er5 RS-485 communications error | Cause: A communications error occurred during RS-485 communication. Solution: 1. Communications conditions of the inverter do not match that of the host equipment. [Sub code: 0002] – Compare the settings of function codes H32 to H40 with those of the host equipment. – Correct any settings that differ. 2. Even though no-response error detection time (H38) has been set, communication is not performed within the specified cycle. [Sub code: 0001] – Check the host equipment. – Change the settings of host equipment software or disable the no-response error detection (H38 = 0). 3. The host equipment did not operate due to defective software, settings, or defective hardware. [Sub code: 0002] – Check the host equipment (e.g., PLCs and host computers). – Remove the cause of the equipment error. 4. The RS-485 converter did not operate due to incorrect connections and settings, or defective hardware. – Check the RS-485 converter (e.g., check for poor contact or incorrect connections). – Change the various RS-485 converter settings, reconnect the wires, or replace hardware with recommended devices as appropriate. 5. Broken communications cable or poor contact. – Check the continuity of the cables, contacts and connections. – Replace the cable. 6. Inverter affected by strong electrical noise. – Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of communications cables and main circuit wires). – Check if decreasing the baud rate (H34) down to 2400 bps causes no alarm. – Implement noise control measures. – Implement noise reduction measures on the host side. – Replace the RS-485 converter with a recommended insulated one. – Keep the inverter running, using any proper communications error processing (H32). 7. Terminating resistor not properly configured. – Check that the inverter serves as a terminating device in the network. – Configure the terminating resistor switch (SW4) for RS-485 communication correctly. (To use the inverter as a terminating device, turn the switch to the ON position.) 8. Response interval does not match the send/receive switching time of the RS-232C−RS-485 converter. – Check whether the specified response interval (H39) matches the specification of the actual converter. – Match the response interval (H39) with the specification of the converter. |
| Er6 Operation error | Cause: An incorrect operation was attempted. Solution: 1. Restrictions on mounting of option(s) not observed. [Sub code: 0001] – Check the model of option(s) mounted. – Check the restrictions on mounting of the option(s). (This error cannot be shown as mounting status of control options on the – OPTION pages of the LCD monitor in Menu #4 “I/O CHECK.”) – Check whether the configurations of the customizing switches (SW) on the two option boards are the same. – Change the SW configuration. 2. Auto-tuning not performed in accordance with correct procedure. [Sub code: 0002] – Check whether tuning started with digital input BX, STOP1, STOP2 or STOP3 being ON. – With all of BX, STOP1, STOP2 and STOP3 being OFF, start tuning. – Check whether tuning started with digital input EN1 or EN2 being opened. – With each of EN1 and EN2 being short-circuited with PS, start tuning. – Check whether 20 seconds or more have elapsed after writing to H01 until the key is pressed. – Press the key within 20 seconds after writing to H01. – Before writing to H01, make sure that F02 = 0 and H30 = 0 or 1. 3. PG detection circuit self-diagnosis function performed with the PG (SD)/PGo (SD) card being mounted. – Check whether the PG (SD)/PGo (SD) card is mounted. – Remove the PG (SD)/PGo (SD) card, then perform the self-diagnosis function of the PG detection circuit (H74). 4. The multiplex system station number of the optical link option (specified by o50) is greater than the setting of o34 (Number of slaves). – Review the settings of o50 and o34. 5. Motor drive control other than the vector control (e.g., V/f control) is selected with an optical link option being used. – Change the motor drive control to the vector control |
| Er7 Output wiring fault | Cause: Auto-tuning failed. Solution: 1. A phase was missing (There was a phase loss) in the connection between the inverter and the motor. [Sub code: 0001] – Properly connect the motor to the inverter. 2. A tuning operation involving motor rotation (H01 = 4) was attempted while the brake was applied to the motor. [Sub code: 0002] – Check that the brake can be released. – Specify the tuning that does not involve the motor rotation (H01 = 2 or 3). – Release the brake before tuning that involves the motor rotation (H01 = 4). |
| Er8 A/D converter error | Cause: An error occurred in the A/D converter circuit. Solution: 1. Inverter affected by strong electrical noise. – Check if appropriate noise control measures have been implemented (e.g. correct grounding and routing of signal wires, communications cables, and main circuit wires). – Implement noise control measures. 2. Short circuit on the printed circuit board(s). [Sub code: 0001 to 0004] – Check the printed circuit board(s) for short circuits, accumulation of dust or dirt. – Check for dew condensation in the inverter unit. – Check whether foreign materials have gotten into the inverter unit. – Fix the printed circuit board(s). |
| Er9 Speed mismatch | Cause: An excessive deviation has occurred between the speed command and the detected speed. Solution: 1. Incorrect setting of function code data. [Sub code: 0001 to 0003] – Check the data of the following function codes; P05, A07 and A107 (Motor, No. of poles), P28, A30 and A130 (Feedback encoder pulse count/rev), and P29, A51 and A151 (Feedback pulse correction factor 1). – Specify motor parameters in accordance with the motor and PG. – Review the data of the following function codes. • E43 (Speed agreement, Detection width) • E44 (Speed agreement, Off-delay timer) • E45 (Speed agreement, Alarm) Measure the inverter output current. – Reduce the load. – Increase the inverter capacity. 2. Overload. [Sub code: 0001 to 0003] – Check whether any mechanical brake is working. – Release the mechanical brake. 3. Mismatch between function code settings and the motor characteristics. [Sub code: 0001 to 0003] – Check the motor parameters. – Perform auto-tuning, using H01. – Check the wiring between the PG and the inverter. – Correct the wiring. 4. Wrong wiring between the pulse generator (PG) and the inverter. [Sub code: 0001 to 0003] – Check that the relationships between the PG feedback signal and the run command are as follows: • For the FWD command: the B phase pulse is in the High level at rising edge of the A phase pulse • For the REV command: the B phase pulse is in the Low level at rising edge of the A phase pulse – If the relationship is wrong, interchange the A and B phase wires. – Note that if the digital input signal IVS (“Switch normal/inverse operation”) is active, the above operation is reversed. 5. Wrong wiring to the motor. [Sub code: 0001 to 0003] – Check the wiring to the motor. – Connect the inverter output terminals U, V, and W to the motor input terminals U, V, and W, respectively. – It is also possible to use H75 (Phase sequence configuration of main circuit output wires). – Under vector control with/without speed sensor 6. The motor speed does not rise due to the torque limiter operation. [Sub code: 0001 to 0003] – Check the setting of the torque limiter level (F44, F45). – Change the F44 or F45 data to an appropriate value. If no torque limiter is required, disable the torque limiter (F40 = 0). 7. During running of the motor (after the mechanical brake is released), the deviation between the speed command (Reference speed 4, ASR input) and the actual speed exceeds the setting of H149. [Sub code: 0008] – Check the wiring to the motor. z- Connect the inverter output terminals U, V, and W to the motor input terminals U, V, and W, respectively. |
| Erb Inter-inverter communications link error | Cause: A communications link error occurred between optical link options. Solution: 1. The optical cable is disconnected or inserted poorly into the connector. – Connect the optical cable fully. 2. The optical cable is bundled or bent with the bend radius of 35 mm or less. – Increase the bend radius to more than 35 mm. 3. The colors (gray and dark blue) of the connection plugs of the optical link cable do not match those of the connectors on the printed circuit board. – Match the colors of the connection plugs with those of the connectors on the printed circuit board. 4. The optical cable connection does not form an optical loop. – Review the connection of the optical cable to form an optical loop. 5. The same hardware station number is double assigned by o50. – Review the setting of o50. 6. The slave station is not sequentially numbered by o50 relative to the master station number. – Review the setting of the slave stations (o50). 7. A run command (FWD/REV) has entered before the establishment of the optical communications link. – Do not enter a run command until the establishment of the optical communications link. |
| Erh Hardware error | Cause: The LSI on the power supply printed circuit board (PCB) malfunctions. Solution: 1. The control circuit PCB or power supply PCB is defective. – The control circuit PCB or power supply PCB (including the gate PCB) needs to be replaced. |
| Err Mock alarm | Cause: The LED displays Err. – The “STOP + FUNC/DATA” keys were held down for more than 5 seconds. Solution: 1. To escape from this alarm state, press the FUNCTION/DATA key. |
| Lin Power supply phase loss | Cause: Input phase loss occurred, or interphase voltage unbalance rate was large. Solution: 1. Breaks in wiring to the main power input terminals. – Measure the input voltage. – Repair or replace the main circuit power input wires or input devices (MCCB, MC, etc.). 2. The screws on the main power input terminals are loosely tightened. – Check if the screws on the main power input terminals have become loose. – Tighten the terminal screws to the recommended torque. 3. Interphase voltage unbalance between three phases was too large. Measure the input voltage. – Connect an AC reactor (ACR) to lower the voltage unbalance between input phases. – Increase the inverter capacity. 4. Overload cyclically occurred. Correct the load. – Increase the inverter capacity. 5. Single-phase voltage was input to the three-phase input inverter. – Connect the inverter to the three-phase voltage power supply. (The FRENIC-VG is a three-phase inverter.) |
| LoC Start delay | Cause: At the startup, an excessive deviation has occurred between the speed command and the detected speed. Solution: 1. Incorrect setting of function code data. – Check the data of the following function codes; P05, A07 and A107 (Motor, No. of poles), P28, A30 and A130 (Feedback encoder pulse count/rev), and P29, A51 and A151 (Feedback pulse correction factor 1). – Specify motor parameters in accordance with the motor and PG. – Review the data of the following function codes. • H140 (Start delay, Detection level) • H141 (Start delay, Detection timer) 2. Overload – Measure the inverter output current. – Reduce the load. – Increase the inverter capacity. – Check whether any mechanical brake is working. – Release the mechanical brake. 3. Mismatch between function code settings and the motor characteristics. – Check the motor parameters. – Perform auto-tuning, using H01. 4. Wrong wiring between the pulse generator (PG) and the inverter. – Check that the relationships between the PG feedback signal and the run command are as follows: • For the FWD command: the B phase pulse is in the High level at rising edge of the A phase pulse • For the REV command: the B phase pulse is in the Low level at rising edge of the A phase pulse – If the relationship is wrong, interchange the A and B phase wires. – Note that if the digital input signal IVS (“Switch normal/inverse operation”) is active, the above operation is reversed. 5. Wrong wiring to the motor. Check the wiring to the motor. – Connect the inverter output terminals U, V, and W to the motor input terminals U, V, and W, respectively. – It is also possible to use H75 (Phase sequence configuration of main circuit output wires). 6. The motor speed does not rise due to the torque limiter operation. – Check the setting of the torque limiter level (F44, F45). – Change the F44 or F45 data to an appropriate value. If no torque limiter is required, disable the torque limiter (F40 = 0). 7. During running of the motor (after the mechanical brake is released), the reference torque current (F44, F45) exceeds the specified level (H140) and the actual speed drops below the specified stop speed (F37), and then the state is kept for the specified duration (H141). – Check the wiring to the motor. – Connect the inverter output terminals U, V, and W to the motor input terminals U, V, and W, respectively |
| LU/LV Undervoltage | Cause: DC link bus voltage has dropped below the undervoltage detection level. Solution: 1. A momentary power failure occurred. – Release the alarm. – To restart running the motor without treating this condition as an alarm, set F14 to “3,” “4,” or “5,” depending on the load type. 2. The power to the inverter was switched back to ON too soon (when F14 = 1). – Check if the power to the inverter was switched back to ON while the control power was still alive. (Check whether the LEDs on the keypad light.) – Turn the power ON again after all LEDs on the keypad go off. 3. The power supply voltage does not reach the inverter’s specification range. – Measure the input voltage. – Increase the voltage to within the specified range 4. Peripheral equipment for the power circuit malfunctioned, or the connection is incorrect. – Measure the input voltage to find which peripheral equipment malfunctioned or which connection is incorrect. – Replace any faulty peripheral equipment, or correct any incorrect connections. 5. Any other load(s) connected to the same power supply has required a large starting current, causing a temporary voltage drop. – Measure the input voltage and check the voltage fluctuation. – Reconsider the power supply system configuration. 6. Insufficient capacity of the power supply transformer increases load, causing a voltage drop. – Measure the output current. – Reduce the load. – Reconsider the capacity of the power supply transformer 7. No power is supplied to the auxiliary control power input terminals R0 and T0. Fan power supply switching connectors CN W and CN R are set as follows. CN W (white): [FAN] position CN R (red): [NC] position – Measure the input voltage of the auxiliary power supply. – Insert various circuit breakers or magnetic contactor (MC). – Check for voltage drop, connection failure, poor contact and other problems, then take measures against them. |
| nrb NTC thermistor wire break error | Cause: A wire break is found in the NTC thermistor detection circuit. Solution: 1. The NTC thermistor cable is broken. – Check whether the motor cable is broken. – Replace the motor cable. 2. The temperature around the motor is extremely low (lower than -30°C). – Measure the temperature around the motor. – Reconsider the use environment of the motor. 3. The NTC thermistor is broken. Measure the resistance of the NTC thermistor (including a spare thermistor). – Connect a spare thermistor to the motor. – If the spare thermistor is also broken, replace the motor. |
| OC Overcurrent | Cause: The inverter momentary output current exceeded the overcurrent level. Solution: 1. The inverter output lines were short-circuited. Disconnect the wiring from the inverter output terminals ([U], [V] and [W]) and measure the interphase resistance of the motor wiring. Check if the resistance is too low. Î Remove the short-circuited part (including replacement of the wires, relay terminals and motor). 2. Ground faults have occurred at the inverter output lines. Disconnect the wiring from the output terminals [U], [V] and [W] and perform a Megger test for the inverter and the motor. Î Remove the grounded parts (including replacement of the wires, relay terminals and motor). 3. Overload. Measure the motor current with a measuring device to trace the current trend. Then, use this data to judge if the trend is over the calculated load value for your system design. – If the load is too heavy, reduce it or increase the inverter capacity. Trace the current trend and check if there are any sudden changes in the current. – If there are any sudden changes, make the load fluctuation smaller or increase the inverter capacity. – Under V/f control Enable overcurrent limiting (H58 = 1). 4. Excessive torque boost specified (in the case of manual torque boost) – Check whether decreasing the torque boost (P35, A55, A155) decreases the output current but does not stall the motor. – If no stall occurs, decrease the torque boost (P35, A55, A155). Under V/f control 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. – Increase the acceleration/deceleration time (F07, F08, C46, C47, C56, C57, C66, C67). – Increase the inverter capacity. – Review the braking method. 6. Malfunction caused by noise. – Check if noise control measures are appropriate (e.g., correct grounding and routing of control and main circuit wires). – Implement noise control measures. – Enable the Auto-reset (H04). – Connect a surge absorber to magnetic contactor’s coils or other solenoids (if any) causing noise. 7. The carrier frequency is low. – Check the motor sound (carrier frequency) specified by F26. – Increase the setting of F26. (Note that increasing the carrier frequency excessively may cause other devices to malfunction due to noise generated from the inverter.) 8. Exciting current was too small during auto-tuning. – Check whether it happens during auto-tuning. – Increase the exciting current (P08, A10, A110) and then perform auto-tuning. 9. Mismatch between the PG’s pulse resolution and the function code setting. – Check the function code setting (P28, A30, A130). – Match the function code settings with the PG specifications. (10)Wrong wiring of the PG. – Check the wiring between the PG and the inverter for the phase sequence, wire breaks, shielding and twisting. – Correct the wiring. 11. PG defective. – Check whether the inverter internal control circuit (PG input circuit) is faulty, using the self-diagnosis function of the PG detection circuit (H74). – If the result is “Normal,” replace the PG; if it is “Abnormal,” then need to repair drive. – Check the PG waveform using an oscilloscope. – Replace the PG. |
| OH1 Heat sink overheat | Cause: Temperature around heat sink has risen abnormally. Solution: 1. The surrounding temperature exceeded the range of the inverter specification. – Measure the temperature around the inverter. – Lower the temperature around the inverter (e.g., ventilate the panel where the inverter is mounted). 2. Ventilation path is blocked. [Sub code: 0001 to 0008] – Check if the heat sink is not clogged. – Clean the heat sink. – Check the cumulative run time of the cooling fan. – Replace the cooling fan. 3. Cooling fan’s airflow volume decreased due to the service life expired or failure. [Sub code: 0001 to 0008] [Sub code: 0010 to 0200] Visually check whether the cooling fan rotates normally. – Replace the cooling fan. 4. Overload. [Sub code: 0001 to 0008] – Measure the output current. – Reduce the load (Use the heat sink overheat early warning INV-OH (E15 through E27) or the inverter overload early warning INV-OL (E15 through E27) to reduce the load before the overload protection is activated.). – Decrease the data of F26 (Motor sound, Carrier frequency). |
| OH2 External alarm | Cause: External alarm was inputted (THR). – when the “Enable external alarm trip” THR has been assigned to any of digital input terminals. Solution: 1. An alarm function of external equipment was activated. – Check the operation of external equipment. 2. Wrong connection or poor contact in external alarm signal wiring. – Check if the external alarm signal wiring is correctly connected to the terminal to which the “Enable external alarm trip” terminal command THR has been assigned (Any of E01 through E09 should be set to “9.”). 3. Incorrect setting of function code data. – Check whether the normal/negative logic of the external signal matches that of the THR command specified by E14. |
| OH3 Inverter internal overheat | Cause: Temperature inside the inverter has exceeded the allowable limit. Solution: 1. The surrounding temperature exceeded the inverter’s specification limit. – Measure the surrounding temperature. 2. Temperature detection circuit failure (Thermistor wire break). – There is an hardware issue in drive need to repair or replace drive. |
| OH4 Motor overheat (PTC/NTC thermistor) | Cause: Temperature of the motor has risen abnormally. Solution: 1. The temperature around the motor exceeded the range of the motor specification. – Measure the temperature around the motor. 2. Cooling system for the motor defective. – Check if the cooling system of the motor is operating normally. 3. The activation level (E32) of the PTC thermistor for motor overheat protection was set inadequately. – Check the PTC thermistor specifications and recalculate the detection voltage. 4. Settings for the PTC/NTC thermistor are improper. – Check the setting of the thermistor mode selection (function code P30, A31, A131). |
| OLn Overload of motor 1 through 3 | Cause: Electronic thermal protection for motor 1, 2, or 3 activated. Solution: 1. The electronic thermal characteristics do not match the motor overload characteristics. – Check the motor characteristics. 2. The activation level for the electronic thermal protection was not appropriate. – Check the continuous allowable current of the motor 3. The specified acceleration/ deceleration time was too short. – Recalculate the acceleration/deceleration torque and time needed for the load, based on the moment of inertia for the load and the acceleration/deceleration time. 4. Overload. – Measure the output current. |
| OL1 Motor 1 overload | Cause: Electronic thermal protection for motor 1 activated. Solution: 1. The electronic thermal characteristics do not match the motor overload characteristics. – Check the motor characteristics. 2. The activation level for the electronic thermal protection was not appropriate. – Check the continuous allowable current of the motor 3. The specified acceleration/ deceleration time was too short. – Recalculate the acceleration/deceleration torque and time needed for the load, based on the moment of inertia for the load and the acceleration/deceleration time. 4. Overload. – Measure the output current. |
| OL2 Motor 2 overload | Cause: Electronic thermal protection for motor 2 activated. Solution: 1. The electronic thermal characteristics do not match the motor overload characteristics. – Check the motor characteristics. 2. The activation level for the electronic thermal protection was not appropriate. – Check the continuous allowable current of the motor 3. The specified acceleration/ deceleration time was too short. – Recalculate the acceleration/deceleration torque and time needed for the load, based on the moment of inertia for the load and the acceleration/deceleration time. 4. Overload. – Measure the output current. |
| OL3 Motor 3 overload | Cause: Electronic thermal protection for motor 3 activated. Solution: 1. The electronic thermal characteristics do not match the motor overload characteristics. – Check the motor characteristics. 2. The activation level for the electronic thermal protection was not appropriate. – Check the continuous allowable current of the motor 3. The specified acceleration/ deceleration time was too short. – Recalculate the acceleration/deceleration torque and time needed for the load, based on the moment of inertia for the load and the acceleration/deceleration time. 4. Overload. – Measure the output current. |
| OLU Inverter overload | Cause: Electronic thermal overload protection for inverter activated. Solution: 1. The surrounding temperature exceeded the range of the inverter specification. Measure the temperature around the inverter. 2. Excessive torque boost specified. Check whether decreasing the torque boost (P35, A55, A155) does not stall the motor. 3. The specified acceleration/ deceleration time was too short. Recalculate the acceleration/deceleration torque and time needed for the load, based on the moment of inertia for the load and the acceleration/deceleration time. 4. Overload. Measure the load factor to see that it does not exceed 100%. 5. Ventilation paths are blocked. – Check if there is sufficient clearance around the inverter. |
| OPL Output phase loss | Cause: Output phase loss occurred. Solution: 1. nverter output wires are broken. – Measure the output current. 2. The motor winding is broken. – Measure the output current. 3. The inverter output terminals or motor input terminals are weakly tightened. – Check if any screws on those terminals have become loose. 4. A single-phase motor has been connected. – Single-phase motors cannot be used. |
| OS/O5 Overspeed | Cause: The motor rotates in an excessive speed (when Motor speed ≥ Maximum speed setting × H90÷100). Solution: 1. Incorrect setting of function code data. – Check the maximum speed setting (function code F03, A06, A106). 2. Insufficient gain of the speed controller (ASR). – Check whether the actual speed overshoots the commanded one in higher speed operation. 3. The overspeed alarm detection level is not appropriate. – Check the setting of the overspeed alarm detection level (H90, Factory default 120%). 4. The motor parameters do not match the connected motor. – Check whether the setting of function code P02 matches the connected motor. |
| OU/OV Overvoltage | Cause: The DC link bus voltage exceeded the overvoltage detection level. Solution: 1. The power supply voltage exceeded the range of the inverter specification. – Measure the input voltage. 2. A surge current entered the input power supply. – In the same power line, if a phase-advancing capacitor is turned ON/OFF or a thyristor converter is activated, a surge (momentary large increase in the voltage or current) may be caused in the input power. 3. The deceleration time was too short for the moment of inertia of the load. – Recalculate the deceleration torque based on the moment of inertia of the load and the deceleration time. 4. The acceleration time was too short. – Check if an overvoltage alarm occurs after rapid acceleration. 5. Braking load was too heavy. – Compare the braking torque of the load with that of the inverter. 6. The inverter output lines were short-circuited. – Disconnect the wiring from the inverter output terminals ([U], [V] and [W]) and measure the interphase resistance of the motor wiring. Check if the resistance is too low. |
| PG/P9 PG wire break | Cause: The pulse generator (PG) wire has been broken somewhere in the circuit. Solution: 1. Wire break between the pulse generator (PG) and the option. – Check whether the PG is correctly connected to the option or any wire is broken. 2. Connection failure of speed/magnetic pole position sensor. – Check the output wiring of the speed/magnetic pole position sensor for poor contact or the phase sequence of the AB phases and UVW phases. 3. Motor rotation direction and sensor output not matched. – Check the motor wiring for poor contact or the phase sequence. 4. onnection failure of option card(s) – Check whether the connector of the option card engages with that of the inverter unit. 5. PG related circuit affected by strong electrical noise. – Check if appropriate noise control measures have been implemented (e.g., correct grounding and routing of signal wires, communication cables, and main circuit wires). 6. Mismatch between the PG power voltage (rated) and the output voltage setting of terminal [PGP]. – Check the PG power voltage (rated) and the output voltage setting of terminal [PGP] (switchable with SW6). |
| PbF Charger circuit fault | Cause: The magnetic contactor for short-circuiting the charging resistor failed to work. (For 200 V class series of 37 kW or above and those of 75 kW or above). Solution: 1. No control power was supplied to the magnetic contactor (MC) intended for short-circuiting the charging resistor. – Check that, in normal connection of the main circuit (not a connection via the DC link bus), the connector (CN R) on the power printed circuit board (power PCB) is not inserted to NC . 2. Breaks in wiring to the main power input terminals. – Measure the input voltage. |
| .75 KW to 6000 KW |