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Schneider inverter repair

The keyboard panel LCD displays: overcurrent during addition, subtraction, and constant speed. For short-term high-current OC alarms, generally there is a problem with the current detection circuit of the driver board. The module may also have been impacted (damaged), and the fault may continue to occur after reset. The reasons are basically as follows: : The arc effect occurs when the motor cable is too long, the output leakage current is too large due to critical cable selection, or the load current increases due to loose output cable joints and damaged cables.
  • Description
  • Parameters

    (1) Schneider inverter OC alarm

    The keyboard panel LCD displays: overcurrent during addition, subtraction and constant speed. For short-term high-current OC alarms, generally there is a problem with the current detection circuit of the driver board. The module may also have been impacted (damaged), and the fault may continue to occur after reset. The reasons are basically as follows: : The arc effect occurs when the motor cable is too long, the output leakage current is too large due to critical cable selection, or the load current increases due to loose output cable joints and damaged cables. When the 24V fan power supply of a small capacity (below 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 appears 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 displays: The frequency converter is overloaded. When this alarm occurs in the G/P9 series inverter, there are three methods to solve it: first, modify the parameter settings of "torque boost", "acceleration and deceleration time" and "energy-saving operation"; secondly, use the card table Measure whether the output of the frequency converter is really too large. Finally, use an oscilloscope to observe the output of the detection point in the upper left corner of the motherboard to determine whether the motherboard has been damaged.

    (3) Schneider inverter OU1 alarm

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

    (4) LU alarm

    The keyboard panel LCD displays: Under voltage. If the equipment often reports "LU undervoltage" alarms, you can consider initializing the parameters of the inverter (confirm after setting H03 to 1), and then increase the carrier frequency of the inverter (parameter F26). If the E9 device LU undervoltage alarm occurs and cannot be reset, there is a problem with the (power) driver board.

    (5) EF alarm

    Keyboard panel LCD display: short circuit fault to ground. When this alarm occurs in the G/P9 series inverter, it may be that the main board or the Hall element is faulty.

    (6) Er1 alarm

    The keyboard panel LCD displays: Memory abnormality. Regarding the treatment of the "ER1 does not reset" fault of the G/P9 series inverter: remove the FWD-CD short-circuit piece, power on, keep pressing the RESET button to power off, wait until the LED power indicator light goes out, then let go and then power on again. Check 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

    Keyboard panel LCD display: Bad auto-tuning. When this fault alarm occurs in the G/P11 series inverter, it is usually because the charging resistor is damaged (small capacity inverter). The other is to check whether the internal contactor is closed (for large-capacity inverters, above 30G11, the alarm will only occur when the inverter is loaded and outputs) and whether the auxiliary contacts of the contactor are in good contact. If the internal contactor is not closed, you can first check the drive. Is the 1A fuse on the board damaged? There may also be a problem with the driver board - you can check whether the two-core signal sent to the motherboard is normal.

    (8) Schneider inverter Er2 alarm

    Keyboard panel LCD display: Panel communication abnormality. For inverters above 11kW, this alarm will occur when the 24V fan power supply is short-circuited (mainboard problem). For E9 series machines, the DTG component of the display panel is usually damaged. When this component is damaged, it will also cause damage to the main board, which is manifested as an OC alarm immediately when power is turned on after replacing the display panel. For the G/P9 machine that displays the "ER2" alarm as soon as it is powered on, it means that the capacitor on the driver board has failed.

    (9) OH1 overheating alarm

    The keyboard panel LCD displays: 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 of the base plate) and OH3 (detection of the motherboard) are connected in series and then sent to the CPU, and the CPU randomly reports any one of the faults. When the "OH1" alarm occurs, you should first check whether the ambient temperature is too high and whether the cooling fan is working properly. Secondly, check whether the heat sink is blocked (such alarms will occur in food processing and textile applications). If in a constant pressure water supply situation and an analog quantity is used, this fault is usually likely to occur when using an 800Ω potentiometer. The capacity of the given potentiometer cannot be too small, not less than 1kΩ; and the active end of the potentiometer can also be connected incorrectly. This alarm. If the 220V fan of a large-capacity inverter (30G11 or above) does not rotate, an overheating alarm will definitely occur. At this time, you can check whether the fuse FUS2 (600V, 2A) on the power supply board is damaged. When the "OH3" alarm occurs, it is usually because the small capacitor on the driver board fails due to overheating. The result (symptom) of the failure is that the three-phase output of the inverter is unbalanced. Therefore, when "OH1" or "OH3" appears in the inverter, you can first power on and check whether the three-phase output of the inverter is balanced.

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