1. How to distinguish between heavy faults and light faults?
In the case of a light fault, the system issues an alarm signal and the fault indicator flashes. When a heavy fault occurs, the system issues a fault indication and the fault indicator is always on. At the same time, the command is issued to break the high voltage and close the switch, and the fault information and the high voltage breaking command are memorized. The fault status is not eliminated, and the fault indication and high voltage disconnect command are still valid.
2. What are the light faults?
Light faults include: transformer over-temperature alarm, cabinet temperature over-temperature alarm, cabinet door open, unit bypass, the system does not memorize the light fault, only the fault indication, the alarm is automatically eliminated after the fault disappears. A light fault alarm occurs during the operation of the inverter, and the system does not stop. A light fault alarm occurs during shutdown, and the inverter can continue to run.
3. What are the specific faults?
When the following faults occur in the system, the fault is handled according to the fault, and the fault type is displayed in the upper left corner of the monitor: external fault, transformer overheat, cabinet overheat, unit fault, inverter overcurrent, high voltage loss, interface board fault, controller No communication, interface board not communicating, motor overload, parameter error, main control board failure. Unit failures include: fuse failure, unit overheating, drive failure, fiber failure, and unit overvoltage. External faults must be removed from the high-voltage disconnect (door button or external contact) state before system reset, in order to restore the system to a normal state; after a major fault other than an external fault occurs, a direct system reset can restore the system to a 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 by applying high voltage power again. If the fault is difficult to analyze and it is not possible to determine whether it is possible to double the high voltage, please consult the manufacturer. Note: Do not rush to power up before the cause of the fault is found, otherwise the inverter may be seriously damaged!
4. Transformer over-temperature alarm When the transformer temperature controller measures the temperature 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 properly (if the fan at the bottom of the cabinet is not working properly, there may be a large difference in the three-phase temperature); whether the temperature measuring resistor is normal (with or without wire breakage, poor contact of the line plug, if the contact is bad) , the temperature value will be high); whether the filter is clogged (take an A4 paper on the filter to see if it can be adsorbed, otherwise it needs to clean the filter); Whether the inverter works in overload for a long time; whether the ambient temperature is too high ( The ambient temperature should be lower than 45 °C, otherwise it needs to be reinforced.) The fan switch and contactor installed at the bottom of the front of the transformer cabinet are disconnected; The control and protection circuit of the transformer cabinet fan is normal.
5. When the temperature of the cabinet temperature over temperature alarm unit cabinet temperature measurement point is greater than 55 °C, the system will issue a cabinet temperature over temperature and light fault alarm.
Check whether the top fan of the unit cabinet is working normally, whether the fan switch installed in the secondary room is tripped; whether the filter is blocked (take an A4 paper on the filter net to see if it can be adsorbed, otherwise it needs to clean the filter); Whether it is working in overload condition for a long time; whether the ambient temperature is too high (the ambient temperature should be lower than 45 °C, otherwise it needs to be reinforced (wall mounted fan or cabinet top installed air duct) or installed refrigeration equipment); transformer cabinet fan control and protection Is the circuit normal?
6. When the transformer overheating transformer temperature controller measures the temperature greater than its set trip temperature (the default setting is 130 °C), the temperature controller trip contact is closed and the system will report the transformer overheat fault. Whether the temperature displayed by the temperature controller is above 130 degrees, if not, check if the over temperature alarm value of the temperature controller is set to 130 degrees; for other items, see the transformer over temperature alarm.
7. Cabinet temperature overheating
When the temperature of the unit cabinet temperature measurement point is greater than 60 °C, the system will report the cabinet temperature overheating heavy fault. Check the item to see the cabinet temperature over temperature alarm.
8. Whether the cabinet door interlocking alarm travel switch is compacted with the top of the cabinet door;
Is the “pre-stroke†and “over-stroke†of the travel switch appropriate; whether the electrical function of the travel switch is working properly; otherwise, replace the interface board.
9. The controller does not communicate to 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 fault monitor has established communication with the controller. If the monitor detects that the main control board is faulty, it reports that the main control board is faulty. Replace the monitor. Replace the main control board.
11. The interface board does not communicate with the interface board . The interface board will reset the monitor every 5 seconds. If the communication is still not established within 3 minutes and 30 seconds, it will be judged to be a heavy fault. Is the communication line normal, check if the terminal is correct; whether the I/O board works normally, especially the working voltage; whether the chip outside the I/O main control board is properly inserted.
12. Parameter error When modifying the parameter, if the set parameter is incorrect (this fault may be reported during synchronous vector control), the parameter error is reported. Please re-modify the parameter and press the reset button.
13. External fault When the local high-voltage disconnect button is closed or the high-voltage disconnect 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. The high voltage power supply of the high voltage power supply disappears. Usually caused by normal opening operation . If there is abnormal high voltage power failure (no fault record, no trip operation), please check the upper switchgear opening circuit.
15. When the output current of the inverter over-current inverter exceeds 1.5 times of the rated current of the inverter, the inverter will over-current protection. Whether the output voltage detection board is normal, whether there is obvious short circuit or discharge trace; whether the optical fiber is tightly inserted, whether the main circuit connection screw is tight; whether the Hall element power supply is normal, and the Hall element output current signal is correct; Check whether the parameter setting acceleration time is Is it too short, the torque boost is too large, the starting frequency is too high; Whether the motor or load machinery is blocked, the motor windings and the output cable insulation are damaged; Make sure all the units are working properly (remove the unit to connect the copper bars, use a multimeter or an oscilloscope) Whether the input and output voltages and waveforms of the detection unit are normal); Whether the input power supply voltage is too low; There is a power factor correction capacitor or surge absorbing device on the output side of the inverter, which may cause resonance with the inductor. Cancel the relevant device; The unit detects whether the board is short-circuited or damaged. If the above causes are still faulty, replace the controller signal board or main control board. In some scenes, due to the effect of cogging, etc., the current fluctuates greatly at low speeds of the motor. At this time, the inverter may have a current limit, which causes the inverter to repeat acceleration, current limiting, and the like, and cannot 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 region to avoid overcurrent protection. (In this case, if the unit output voltage is low, replace the unit).
16. The output current of the motor overcurrent inverter is greater than 1.2 times the rated current of the motor and lasts for more than 2 minutes . Check the parameters to set whether the 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 turn after the inverter is running.
Check whether the inverter output has contactor or switch type equipment; Check whether the inverter output primary cable is connected to the motor; Observe whether the monitor has output current and output voltage. If there is voltage or no current, the main circuit of the inverter to the motor is open. If there is voltage or current, check whether the cable has single-phase grounding and whether the motor rotor winding is open.
18. Unit heavy faults (including fuses, drives, overheating, overvoltage, fiber faults) There are five types of unit faults, including fuse faults, drive faults, unit overheating, unit overvoltage, and fiber faults. The first three faults can be Road (valid if the unit has a bypass function and the number of bypass stages is set to non-zero).
19. When the fuse failure detects that the unit is out of phase, the fuse is faulty.
Please check if the main power supply is out of power; whether the three-phase incoming line of the unit is loose; if the incoming fuse is intact, if the fuse is open, replace the unit.
20. Drive failure
Check whether the unit voltage detection board is short-circuited. If the short circuit will cause A1, B1 and C1 units to report 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.
twenty one. Unit overheating
The temperature switch (normally closed point) is installed on the radiator inside the unit. When the temperature exceeds 85 °C, the temperature relay is normally closed and the unit is overheated.
Check whether the fan at the top of the cabinet is working properly, whether the fan switch of the unit cabinet is tripped, and whether the filter is blocked (take an A4 paper on the filter to see if it can be adsorbed, otherwise it needs to clean the filter); Whether the temperature is too high (the ambient temperature should be lower than 45 °C, otherwise it is necessary to strengthen the ventilation), install the fan or the top of the cabinet to install the air duct or install the refrigeration equipment;
The unit control board is broken, and finally check if the power unit temperature relay is normal.
twenty two. Unit overpressure
If the DC bus voltage exceeds the protection value, the inverter reports overvoltage.
When the inverter is running, if the output voltage of a unit is low, it will cause the three-phase output to be unbalanced, and the unit will be over-voltage. When the no-load motor is commissioned, the DC bus overvoltage and A1/B1/C1 unit are more likely to occur. Overvoltage, at this time, the reference voltage can be appropriately lowered.
Check if the input high voltage power supply exceeds the maximum allowable value (when the power supply voltage is too high, adjust the transformer tap to 105%);
Overvoltage occurs during deceleration, please increase the deceleration time setting value of the inverter as appropriate.
twenty three. Fiber failure
When the system does not detect the unit communication in the power-on state, the fiber is faulty. Whether the power unit controls the power supply is normal (the green indicator light is on when it is normal), otherwise the power unit is replaced; whether the power unit and the fiber connector of the controller are off, and the fiber is broken.
twenty four. Unit bypass
When the unit is configured with bypass hardware and the number of bypass stages in the parameter setting is non-zero, if the unit has three faults: drive fault, fuse fault, and unit overheat, the unit bypass will occur.
If a unit fails to be bypassed, the other two units in the same position will also be bypassed. At this time, the inverter can still be started and operated, but the rated output voltage and rated capacity are reduced due to the reduced number of series units per phase. Will be reduced. When the unit bypass occurs, be sure to find out the cause and stop the faulty unit as soon as possible (the remaining two phases are bypassed without replacement); Clean the unit drive board and unit control board, if the two boards are too thick May cause false positives.
25. Operating frequency is inconsistent with the given frequency
There are several reasons for this situation . During acceleration and deceleration, there is a process in which the output frequency reaches a given frequency due to the limitation of acceleration and deceleration time.
When the system voltage is too high, the inverter will decelerate. The inverter has its own protection requirements. At this time, the frequency cannot stay at a numerical 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 automatically reduces the frequency to reduce the output current and avoid overcurrent protection trip. This situation generally occurs when the input voltage is too low or the load is suddenly increased;
In the event of a momentary 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, the unit detection board or the signal board is faulty.
26. Monitor black screen
Press the system reset button on the door (system reset will not affect the normal running state of the inverter); if it still can't recover, check if the power terminal of the monitor is off, the cable is loose, 5V and 15V power supply is normal, monitoring Whether the circuit has obvious damage;
Is there any interference, otherwise please replace the monitor.
27. Parameters cannot be modified
When the parameter modification option is set to disabled in the function parameter, all parameters except the parameter and the given frequency or given parameter cannot be modified.
Most of the parameters cannot be modified during the run.
28. The inverter restarts automatically after stopping
In the remote control mode, the start and stop can only pass through the remote terminal.
If the starting mode in the parameter setting is level starting (closed start, disconnected stop), the emergency stop signal is disconnected during operation or the inverter is stopped by other means, the inverter will immediately stop freely, but when the emergency stop signal After reclosing, the drive will automatically start running because the remote start level signal is still present.
29. When the inverter is powered on, it is tripped. When the inverter is powered on, the instantaneous current RMS can reach 6-7 times of the rated current of the inverter and the duration is tens of milliseconds. If the protection setting value is too small, the upper switch quick-break protection trip will be caused.
Adjust the quick reset protection setting value of the upper switchgear.
30. Output frequency fluctuates at low speed during startup
Some motors are at low speed, because of the effect of cogging, etc., the current fluctuation is very large. At this time, the inverter may have current limiting, which causes the inverter to repeat acceleration, current limiting and deceleration, and cannot accelerate normally. Increase the current limit current setting; shorten the startup time; the output voltage of a unit is low, replace the unit;
31. Automatic bypass cabinet automatic bypass when the upper switchgear trips
Check whether the time of the delay pull-in time relay in the bypass cabinet is between 1.5S and 3S; whether the setting value of the switch cabinet is too small (should be more than 5 times of the rated current of the motor); set the quick-break protection time of the switch cabinet Set to be greater than 0.1S.
32. External terminal has induced AC voltage
It may be remote start/stop, high voltage disconnection, system reset signal line induced voltage. It is recommended that the passive signal be separated from the 220V AC power supply. In this case, it is better to ground the two ends of the shielded wire;
It may be the induced voltage caused by the signal line on the remote control box and the power line. It is recommended to re-wire the remote control box. It is better to use the shielded cable for the missed signal, and the shielded wire should not be too long; 4-20mA The current signal has an AC induced voltage (below 10V) and can be connected between the current signal and ground with a 275V/0.33uf.ZGAR Aurora 500 Puffs
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