1。 How do you distinguish between heavy and light failures?
When the fault is light, the system sends out an alarm signal, and the fault indicator flashes. When a major 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 prohibition, and the fault information and high voltage breaking instructions are memorized. If the heavy fault state is not eliminated, the fault indication and high-voltage breaking instruction are still valid.
2。 What are the minor faults?
Minor faults include: transformer over-temperature alarm, cabinet temperature over-temperature alarm, cabinet door opening, unit bypass, the system does not make memory processing for light faults, only fault indication, and the alarm is automatically eliminated after the fault disappears. If there is a minor fault alarm during the operation of the inverter, the system will not be shut down. In the event of a minor fault alarm during shutdown, the inverter can continue to operate.
3。 What are the specific major failures?
When the following faults occur in the system, they will be handled according to the heavy fault, and the type of heavy fault will be displayed in the upper left corner of the monitor: external fault, transformer overheating, cabinet temperature overheating, unit fault, inverter overcurrent, high-voltage power loss, interface board failure, controller non-communication, interface board non-communication, motor overload, parameter error, and main control board failure. Unit faults include: fuse failure, unit overheating, drive failure, fiber fiber failure, and unit overvoltage. External faults must first release the high-voltage disconnection (cabinet door button or external contact) state and then reset the system to restore the system to a normal state; After a major failure other than an external fault occurs, a direct system reset can restore the system to a normal state, but the cause of the fault must be found before powering on again. After a unit fault occurs, the unit status can only be detected if the high-voltage power supply is applied again. If the fault is difficult to analyze and it is not possible to determine whether the high voltage can be applied a second time, please consult the manufacturer. Note: Do not rush to power on the second time before finding out the cause of the fault, otherwise the inverter may be seriously damaged!
4。 When the measured temperature of the transformer thermostat is greater than the alarm temperature set by it (the default setting is 100°C), the over-temperature alarm contact of the thermostat 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 three-phase temperature); Whether the temperature measurement resistance is normal (whether there is a broken wire, poor contact of the line plug, if the contact is poor, the temperature value will be high); Whether the filter is blocked (take a piece of A4 paper and place it on the filter screen to see if it can be adsorbed, otherwise the filter screen needs to be cleaned); Whether the inverter works 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 ventilation needs to be strengthened); Whether the fan switch and contactor installed at the front bottom of the transformer cabinet are disconnected; Whether the fan control and protection circuit of the transformer cabinet is normal.
5。 When the temperature of the cabinet temperature measurement point is greater than 55°C, the system will send out a light fault alarm for cabinet temperature over-temperature.
Check whether the fan on the top of the unit cabinet is working normally, and whether the fan switch installed in the secondary room is tripped; Whether the filter is blocked (take a piece of A4 paper and place it on the filter screen to see if it can be adsorbed, otherwise the filter screen needs to be cleaned); Whether the inverter works 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 an air duct on the top of the cabinet) or install refrigeration equipment); Whether the fan control and protection circuit of the transformer cabinet is normal.
6。 When the measured temperature of the transformer thermostat is greater than the tripping temperature set by the transformer (the default setting is 130°C), the tripping contact of the thermostat is closed, and the system will report the transformer overheating and serious fault. Whether the temperature displayed by the thermostat is above 130 degrees, if not, check whether the over-temperature alarm value of the thermostat is set to 130 degrees; For the rest of the inspection items, see the transformer over-temperature alarm.
7。 The cabinet temperature is overheated
When the temperature of the temperature measurement point of the unit cabinet is greater than 60°C, the system will report that the cabinet temperature is overheated and seriously faulty. Check the items to see the cabinet temperature over-temperature alarm.
8。 Whether the cabinet door interlock alarm travel switch is compacted with the top of the cabinet door;
whether the "pre-travel" and "over-travel" 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, and confirm that the +15V and +5V on the monitor control board are correct; Replace the MPU. Replace the monitor.
10。 The fault monitor of the main control board has established communication with the controller, and the monitor detects that the main control board is faulty, and the main control board is faulty. Replace the monitor. Replace the MPU.
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