1. How to distinguish between serious and minor faults?
When there is a minor fault, the system will send out an alarm signal and the fault indicator will flash. When a serious fault occurs, the system will issue a fault indication, and the fault indicator will always be on. At the same time, it sends out instructions to break high voltage, prohibit closing, and make memory processing of fault information and high voltage breaking instructions. If the major fault state is not eliminated, the fault indication and high-voltage breaking command are still valid.
2. What are the minor faults?
Minor faults include: transformer over-temperature alarm, cabinet temperature over-temperature alarm, cabinet door open, unit bypass, the system does not memorize minor faults, only fault indication, the alarm will be automatically eliminated after the fault disappears. If a minor fault alarm occurs during the operation of the inverter, the system will not stop. When a minor fault alarm occurs during shutdown, the inverter can continue to start running.
3. What are the specific major faults?
When the following faults occur in the system, follow the major fault processing, and display the major fault types in the upper left corner of the monitor: external fault, transformer overheating, cabinet temperature overheating, unit fault, inverter overcurrent, high voltage loss, interface board fault, controller No communication, interface board no communication, motor overload, parameter error, main control board failure. Unit failures include: fuse failure, unit overheating, drive failure, fiber failure, and unit overvoltage. For external faults, the high-voltage disconnection (cabinet door button or external contact) state must be released and then the system is reset to restore the system to the normal state; after the occurrence of serious faults other than the external fault, the system can be reset directly to restore the system to the normal state. But be sure to find out the cause of the fault before powering up again. After a unit failure occurs, the unit status can only be detected when the high-voltage power supply is applied again. If the fault is difficult to analyze and it is uncertain whether the high voltage can be applied twice, please consult the manufacturer. Note: Do not rush the power on again before finding out the cause of the fault, otherwise the inverter may be seriously damaged!
4. Transformer over-temperature alarm When the measured temperature of the transformer temperature controller is greater than its set alarm temperature (the default setting is 100°C), the temperature controller over-temperature alarm contact is closed.
Check whether the fan at the top of the transformer cabinet or the fan at the bottom of the cabinet is working normally (if the fan at the bottom of the cabinet is not working properly, there may be a large difference in three-phase temperature); whether the temperature measuring resistor is normal (whether there is a broken wire, the line plug is in poor contact, if the contact is poor) , The temperature value will be higher); whether the filter is blocked (take a piece of A4 paper on the filter to see if it can be adsorbed, otherwise the filter needs to be cleaned); whether the inverter has been working in an overload state for a long time; whether the ambient temperature is too high ( The ambient temperature should be lower than 45℃, otherwise it needs to strengthen ventilation); whether the fan switch and contactor installed at the bottom of the front of the transformer cabinet are disconnected; whether the fan control and protection circuit of the transformer cabinet is normal.
5. Cabinet temperature over-temperature alarm unit When the temperature of the cabinet temperature measurement point is greater than 55℃, the system will issue a cabinet temperature over-temperature light fault alarm.
Check whether the fan on the top of the unit cabinet is working properly, whether the fan switch installed in the secondary room is tripped; whether the filter is blocked (put a piece of A4 paper on the filter to see if it can be adsorbed, otherwise the filter needs to be cleaned); Whether it has been working in an overload state for a long time; whether the ambient temperature is too high (the ambient temperature should be lower than 45°C, otherwise it is necessary to strengthen ventilation (install a ventilator on the wall or install a duct on the top of the cabinet) or install refrigeration equipment); control and protection of the fan of the transformer cabinet Whether the circuit is normal.
6. Transformer overheating When the temperature measured by the transformer temperature controller is greater than its set trip temperature (the default setting is 130°C), the temperature controller trip contact is closed, and the system will report a transformer overheating fault.
Whether the temperature displayed by the temperature controller is above 130 degrees, if not, check whether the over-temperature alarm value of the temperature controller is set to 130 degrees; see the transformer over-temperature alarm for other check items.
7. The cabinet temperature is too hot.
When the temperature of the unit cabinet temperature measurement point is greater than 60℃, the system will report the cabinet temperature overheating and serious fault. Check the items in the cabinet temperature over-temperature alarm.
8. Whether the door interlocking alarm travel switch is compacted with the top of the cabinet door.
Whether the "pre-travel" and "overtravel" of the travel switch are appropriate; whether the electrical function of the travel switch is working properly; otherwise, replace the interface board.
9. The controller does not communicate.
Confirm whether the communication line from the monitor control board to the main control board is connected correctly, confirm that the +15V and +5V on the monitor control board are correct; replace the main control board. Replace the monitor.
10. The main control board is faulty.
The monitor and the controller have established communication, and if the monitor detects that the main control board is faulty, it will report the main control board failure. Replace the monitor. Replace the main control board.
11. The interface board fails.
12. The parameter is wrong.
When modifying the parameters, if the set parameters are wrong (this failure may be reported during synchronous vector control), the parameter error failure will be reported. Please modify the parameters again and press the reset button.
13. External fault.
When the local high-voltage breaking button is closed or the high-voltage breaking contact on the interface board is closed, the system will report an external fault. Whether the high-voltage breaking button is pressed; whether the high-voltage breaking terminal is short-circuited; the interface board is broken.
14. High-voltage power failure superior high-voltage power supply disappears.
Generally caused by normal opening operation. If there is an abnormal high-voltage power failure (no fault record, no opening operation), please check the opening circuit of the superior switchgear.
15. Inverter overcurrent.
When the output current of the inverter exceeds 1.5 times of the rated current of the inverter, the inverter will be over-current protected. Whether the output voltage detection board is normal, whether there is obvious short circuit or discharge trace; whether the optical fiber is inserted tightly, whether the main circuit connection screw is fastened; whether the Hall element power supply is normal, and whether the Hall element output current signal is correct; check whether the parameter setting acceleration time is correct Too short, whether the torque boost is too large, whether the starting frequency is too high; whether the motor or load machinery is blocked, whether the motor winding and output cable insulation is damaged; make sure that all units are working properly (remove the unit and connect the copper bar, use a multimeter or oscilloscope Whether the input and output voltage and waveform of the detection unit are normal); whether the input power voltage is too low; there is a power factor correction capacitor or a surge absorption device on the output side of the inverter, which may cause resonance with the inductance. Cancel the relevant components; whether the unit detection board is short-circuited or damaged. If the above reasons are eliminated and the fault still persists, please replace the controller signal board or main control board. In some sites, due to the influence of cogging effect, the current fluctuates greatly when the motor is at low speed. At this time, the inverter may have current limiting, causing the inverter to repeatedly accelerate, limit current and decelerate, and fail to accelerate normally or cause overcurrent protection. In this case, it is necessary to reduce the acceleration time and increase the current-limiting coefficient, so that the motor can quickly pass through the fluctuation area and avoid over-current protection. (In this case, if the output voltage of a unit is low, replace the unit).
16. Motor overcurrent.
The output current of the inverter is 1.2 times greater than the rated current of the motor and lasts for more than 2 minutes. Check whether the parameter setting motor rated current setting is correct; whether the motor or load machinery is blocked; whether the power supply voltage is too low.
17. The motor does not rotate after the inverter is running.
Check whether the inverter output has a contactor or switch equipment; check whether the output cable of the inverter is connected to the motor; observe whether the monitor has output current and output voltage. If there is voltage or no current, it means that the main circuit from the inverter to the motor is open If there is voltage and current, check whether the cable has single-phase grounding and whether the motor rotor winding is open.
18. The unit is seriously faulty.
There are 5 types of unit major failures, including fuse failure, drive failure, unit overheating, unit overvoltage, and fiber failure. The first 3 types of failures can be bypassed (if the unit has a bypass function and the number of bypass stages is set to non Valid at 0).
19. When the fuse failure detects the unit phase loss, the fuse failure will be reported.
Please check whether it is caused by a power failure of the main power supply; whether the three-phase incoming line of the unit is loose; whether the incoming fuse is intact. If the fuse is open, please replace the unit.
20. Drive failure.
Check whether the unit voltage detection board is short-circuited, if the short-circuit will cause the A1, B1 and C1 units to report a drive failure; whether the power unit output terminals L1 and L2 are short-circuited, otherwise the unit IGBT is damaged, please replace the unit; whether the motor insulation is intact; whether the load exists Mechanical failure.
21. The unit is overheated.
A temperature switch (normally closed point) is installed on the radiator in the unit. When the temperature exceeds 85°C, the temperature relay normally closes point is disconnected, and the unit is overheated.
Check whether the cabinet top fan is working normally, whether the unit cabinet fan switch is tripped, whether the filter is blocked (put a piece of A4 paper on the filter to see if it can be adsorbed, otherwise the filter needs to be cleaned); whether it has been working in an overload state and the environment for a long time Whether the temperature is too high (the ambient temperature should be lower than 45°C, otherwise the ventilation needs to be strengthened), install a ventilator on the wall or install an air duct on the top of the cabinet or install refrigeration equipment;
The unit control board is broken, and finally check whether the power unit temperature relay is normal.
22. Unit overvoltage.
If the DC bus voltage exceeds the protection value, the inverter reports overvoltage of the unit.
When the inverter is running, if the output voltage of a certain unit is low, it will cause the three-phase output to be unbalanced, and the unit overvoltage will be reported; when the no-load motor is debugged, it is easier to have DC bus overvoltage and A1/B1/C1 unit Overvoltage, at this time, the reference voltage can be lowered appropriately.
Check whether the input high-voltage power supply exceeds the allowable maximum value (when the power supply voltage is too high, the adjustable transformer tap is connected to 105%);
If overvoltage occurs during deceleration, please increase the deceleration time setting value of the inverter appropriately.
23. Optical fiber failure.
When the system fails to detect unit communication when the system is powered on, it will report a fiber failure. The power unit controls whether the power supply is normal (when it is normal, the green indicator light is on), otherwise replace the power unit; whether the optical fiber connector of the power unit and the controller falls off, and whether the optical fiber is broken.
24. Unit bypass.
When the unit is equipped with bypass hardware and the number of bypass stages in the parameter setting is non-zero, if the unit has three types of failures: drive failure, fuse failure, and unit overheating, unit bypass will occur.
If one unit fails and is bypassed, the other two-phase units at the same position will also be bypassed. At this time, the inverter can still start and run, but due to the reduction in the number of units connected in series per phase, the rated output voltage and rated capacity are both Will be lowered. When a unit bypass occurs, you must find out the cause, and stop and replace the faulty unit as soon as possible (the remaining two phases of the bypassed unit do not need to be replaced); clean the unit drive board and the unit control board, if the dust collection of these two circuit boards is too thick May cause false alarms.
25. The operating frequency is inconsistent with the given frequency.
There are several reasons for this situation. During the acceleration and deceleration process, limited by the acceleration and deceleration time, there is a process for the output frequency to reach the given frequency;
When the system voltage is too high, the inverter will decelerate due to its own protection requirements. At this time, the frequency cannot stay at a value point to avoid DC bus overvoltage protection. At this time, it is recommended to connect the transformer tap to 105%; the inverter output current exceeds the set current limit current value, the inverter will automatically reduce the frequency to reduce the output current and avoid the overcurrent protection tripping. This situation generally occurs when the input voltage is too low or the load increases suddenly;
In the event of an instantaneous power failure, in order to maintain the motor in a controllable state, the inverter will automatically decelerate to obtain energy from the motor; the Hall element, unit detection board or signal board fails.
26. The monitor has a black screen.
Press the system reset button on the cabinet door (system reset will not affect the normal operation of the inverter); if it still cannot be restored, check whether the power terminal of the monitor is off, whether the connection line is loose, whether the 5V and 15V power supply is normal, and monitor Whether there is obvious damage to the circuit of the device;
Whether there is interference phenomenon, otherwise please replace the monitor.
27. The parameters cannot be modified.
When the parameter modification option in the function parameter is set to prohibit, all the other parameters can not be modified except this parameter and the given frequency or given parameter.
During operation, most of the parameters cannot be modified.
28. The inverter automatically restarts after stopping.
In the remote control mode, start and stop can only be done through the remote terminal.
If the start mode in the parameter setting is level start (closed start, open stop), the emergency stop signal is disconnected or the inverter is stopped by other means during operation, the inverter will freely stop immediately, but when the emergency stop signal After re-closing, because the remote start level signal is still there, the inverter will automatically start running.
29. The inverter trips when it is powered on.
When the inverter is powered on, due to the inrush current of the transformer and the charging of the unit capacitor, the instantaneous effective value of the current can reach up to 6-7 times the rated current of the inverter, and the duration is tens of milliseconds; if the upper-level current protection setting value of the inverter is too small, It will cause the superior switch quick-break protection to trip.
Adjust the setting value of the quick-break protection of the superior switch cabinet.
30. The output frequency oscillates at low speed during startup.
In some motors at low speeds, due to the effects of cogging and other effects, the current fluctuates greatly. At this time, the inverter may have current limiting, causing the inverter to repeat acceleration and current limiting deceleration, and cannot accelerate normally. Increase the current limit setting; shorten the start-up time; a certain unit output voltage is low, replace this unit;
31. The upper switch cabinet trips when the automatic bypass cabinet automatically bypasses.
Check whether the delay time of the relay in the bypass cabinet is between 1.5S and 3S; whether the switch cabinet setting value is too small (should be more than 5 times the rated current of the motor); set the switch cabinet's quick-break protection time Set to be greater than 0.1S.
32. The external terminals have induced AC voltage.
It may be remote start/stop, high-voltage disconnection, system reset signal line induced voltage, it is recommended that passive signals be wired separately from 220V AC power supply. In this case, it is best to ground the shielded wire at both ends;
It may be the induced voltage caused by the signal line on the remote control box and the power line tied together. It is recommended to re-wire the remote control box. It is better to use shielded wire for unfavorable signals, and the shielded wire should not be too long; 4-20mA The current signal has an AC induced voltage (below 10V), which can be connected between the current signal and ground with a 275V/0.33uf.
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