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Schneider inverter repair

Keyboard panel LCD display: plus, minus, overcurrent at constant speed. For short-term high-current OC alarms, in general, there is a problem with the current detection circuit of the drive board, and the module may have been impacted (damaged), and it may continue to malfunction after reset. The causes are basically the following situations : The arc effect when the load current rises caused by the excessively long motor cable, the excessive output leakage current caused by the critical cable selection or the loose output cable connector and the cable damage.

Classification:

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    (1) Schneider inverter OC alarm

       keyboard panel LCD display: plus, minus, overcurrent at constant speed. For short-time high-current OC alarms, in general, there is a problem with the current detection circuit of the drive board, and the module may have been impacted (damaged), and it may continue to fail after reset. The causes are basically the following situations : The arc effect when the load current rises caused by the excessively long motor cable, the excessive output leakage current caused by the critical cable selection or the loose output cable connector and the cable damage. When the 24V fan power supply of the small capacity (under 7.5G11) inverter is short-circuited, it will also cause an OC3 alarm. At this time, the 24V fan power supply on the motherboard will be damaged and other functions of the motherboard will be normal. If the "1, OC2" alarm occurs and cannot be reset or the "OC3" alarm is displayed as soon as the power is turned on, there may be a problem with the motherboard. If the "OC3" alarm is displayed as soon as the RUN key is pressed, the driver board is broken.

    (2) Schneider inverter OLU alarm

       The keyboard panel LCD display: the inverter is overloaded. When the G/P9 series inverter has this alarm, there are three ways to solve it: firstly modify the parameter settings of "torque boost", "acceleration/deceleration time" and "energy-saving operation"; secondly, use a card meter to measure whether the output of the inverter is It is really too big and finally use an oscilloscope to observe the output of the detection point on the upper left corner of the main board to judge whether the main board has been damaged.

    (3) Schneider inverter OU1 alarms

       Keyboard panel LCD display: Overvoltage during acceleration. When an "OU" alarm occurs for a general-purpose inverter, first consider whether the cable is too long, whether the insulation is aging, whether the electrolytic capacitor in the DC intermediate link is damaged, and at the same time, consider online auto-tuning of the motor for large inertia loads. In addition, use a multimeter to measure the voltage of the intermediate DC link during startup. If the voltage displayed by the measuring instrument is different from the voltage displayed on the LCD of the operation panel, the detection circuit of the main board is faulty and the main board needs to be replaced. When the DC bus voltage is higher than 780VDC, the inverter will give an OU alarm. When it is lower than 350VDC, the inverter will give an under-voltage LU alarm.

    (4) LU alarm

       Keyboard panel LCD display: under voltage. If the device often alarms "LU undervoltage", consider initializing the parameters of the inverter (set H03 to 1 and confirm), and then increase the carrier frequency of the inverter (parameter F26). If the E9 device LU undervoltage alarms and cannot be reset, it is a problem with the (power supply) driver board.

    (5) EF alarm

       The keyboard panel LCD display: short-circuit fault to ground. When this alarm occurs for G/P9 series inverters, it may be that the main board or Hall element is malfunctioning.

    (6) Er1 alarm

       The keyboard panel LCD display: The memory is abnormal. About G/P9 series inverter "ER1 does not reset" fault handling: remove the FWD-CD short circuit, power on, keep pressing the RESET button to power off, let go and then power on again after knowing that the LED power indicator is off. Whether the "ER1 does not reset" fault is resolved, if it cannot be resolved by this method, it means that the internal code has been lost, and the motherboard can only be replaced.

    (7) Schneider inverter Er7 alarm

       The keyboard panel LCD display: self-tuning is bad. When this fault alarm occurs for G/P11 series inverters, the charging resistor is generally damaged (small-capacity inverters). The other is to check whether the internal contactor is closed (large-capacity inverter, 30G11 or more and it will alarm when the inverter is loaded with output), and whether the auxiliary contact of the contactor is in good contact. If the internal contactor is not closed, check the drive first. Whether the 1A fuse on the board is damaged. It may also be a problem with the driver board—check whether the two-core signal sent to the main board is normal.

    (8) Schneider inverter Er2 alarm

       Keyboard panel LCD display: Panel communication is abnormal. This alarm occurs when the 24V fan power supply is short-circuited for inverters above 11kW (main board problem). For E9 series machines, the DTG component of the display panel is generally damaged. When the component is damaged, it will cause damage to the main board. The performance is an OC alarm immediately after the display panel is replaced and powered on. As for the G/P9 machine, the "ER2" alarm is displayed as soon as it is powered on, it means that the capacitor on the drive board has failed.

    (9) OH1 overheating alarm

       The keyboard panel LCD display: The heat sink is overheated. OH1 and OH3 are essentially the same signal, which is randomly detected by the CPU. The analog signals of OH1 (detection board part) and OH3 (detection main board part) are connected in series and then sent to the CPU, and the CPU randomly reports any failure. When an "OH1" alarm occurs, first check whether the ambient temperature is too high, whether the cooling fan is working properly, and secondly check whether the heat sink is blocked (such alarms may occur in food processing and textile applications). If the constant pressure water supply is used and the analog quantity is used for the timing, this failure is generally easy to occur when using the 800Ω potentiometer. The capacity of the given potentiometer should not be too small, not less than 1kΩ; this alarm will also occur if the active end of the potentiometer is connected incorrectly. . If the 220V fan of the large-capacity inverter (above 30G11) does not turn, an overheating alarm will definitely appear. At this time, check whether the fuse FUS2 (600V, 2A) on the power supply board is damaged. When the "OH3" alarm occurs, it is generally that the small capacitor on the drive board fails due to overheating, and the result (symptom) of the failure is that the three-phase output of the inverter is unbalanced. Therefore, when the inverter displays "OH1" or "OH3", first power on and check whether the inverter's three-phase output is balanced.

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