Schneider inverter common faults and judgments - Solutions - Huaqiang Electronic Network

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(1) Schneider inverter OC alarm: the keyboard panel LCD displays overcurrent during acceleration, deceleration, or constant speed. For short-term high-current OC alarms, it is usually caused by a problem in the current detection circuit of the drive board, or the module may have been damaged due to electrical stress. After resetting, the issue might persist. Common causes include excessive motor cable length leading to arc effects, high output leakage current from improper cable selection, or loose connections and increased load current due to damaged cables. If the 24V fan power supply on a small-capacity inverter (7.5G11 or lower) is shorted, it may trigger an OC3 alarm. In such cases, the 24V fan power supply on the main board is likely damaged, while other functions remain normal. If the "OC2" alarm appears and then "OC3" is displayed after power-on, the motherboard may be faulty. If pressing the RUN button results in "OC3", the drive board is likely broken. (2) Schneider inverter OLU alarm: the inverter is overloaded. When the G/P9 series inverter shows this alarm, you can try three solutions: first, adjust parameters like torque boost, acceleration/deceleration time, and energy-saving operation. Second, use a clamp meter to measure the inverter’s output. If it's too high, proceed to the third step—use an oscilloscope to check the voltage at the upper-left corner of the motherboard to determine if the motherboard is damaged. (3) Schneider inverter OU1 alarm: overvoltage during acceleration. When a general-purpose inverter displays an "OU" alarm, consider factors such as long cable length, aging insulation, or damaged DC link electrolytic capacitors. For systems with large inertia loads, perform motor online self-tuning. Additionally, measure the DC bus voltage with a multimeter during startup. If the reading differs from the panel display, the motherboard’s detection circuit is likely faulty. If the DC bus voltage exceeds 780VDC, the inverter will trigger an OU alarm. If it drops below 350VDC, an LU (under-voltage) alarm will occur. (4) LU alarm: under-voltage. If the device frequently shows a "LU undervoltage" alarm, try resetting the inverter’s parameters (after setting H03 to 1), and increase the carrier frequency (parameter F26). If the E9 series machine continues to show a LU alarm and cannot reset, the driver board is likely faulty. (5) EF alarm: short-circuit to ground. In the G/P9 series inverter, this alarm often indicates a faulty main board or Hall element. (6) Er1 alarm: memory error. For the G/P9 series inverter, if "ER1 does not reset," follow these steps: remove the FWD-CD short circuit, power on, and hold the RESET button until the LED power indicator turns off. Then power on again and check if the "ER1" fault is cleared. If not, the internal code may be lost, requiring a motherboard replacement. (7) Er7 alarm: poor self-tuning. In the G/P11 series inverter, this fault is typically caused by a damaged charging resistor (in small-capacity inverters). For larger units (30G11 or higher), check if the internal contactor is closed and whether its auxiliary contacts are properly connected. If the contactor doesn’t engage, check the 1A fuse on the board. It could also be a driver board issue—verify that the two core signals sent to the motherboard are normal. (8) Er2 alarm: panel communication error. This alarm (usually a main board issue) occurs when the 24V fan power supply is shorted in inverters of 11kW or higher. For the E9 series, the DTG component on the display panel is often damaged, which may lead to motherboard failure. Replacing the panel may result in an immediate OC alarm. In the G/P9 series, an ER2 alarm after power-on may indicate a disabled capacitor on the drive board. (9) OH1 overheating alarm: heat sink overheated. OH1 and OH3 are similar, both being random CPU detections. The signals from the heat sink (OH1) and main board (OH3) are connected in series and sent to the CPU, which randomly reports the fault. When OH1 occurs, check ambient temperature, cooling fan functionality, and whether the heat sink is clogged (common in food processing or textile applications). In constant pressure water systems using an 800Ω potentiometer, ensure the potentiometer has a minimum rating of 1kΩ. Incorrect wiring of the potentiometer’s movable end can also cause this alarm. If the 220V fan on a large inverter (30G11 or higher) fails to rotate, an overheat alarm will definitely occur. At this point, check the FUS2 fuse (600V, 2A) on the power supply board. When OH3 occurs, it is usually due to a failed small capacitor on the drive board, resulting in unbalanced three-phase output. Therefore, if the inverter shows OH1 or OH3, check if the three-phase output is balanced. Overheat alarms can also stem from a faulty motherboard or thermal sensor. The G/P11 series uses an analog thermal sensor, while the G/P9 series uses a switching signal-based one.

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