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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, the issue is typically in the current detection circuit of the drive board, and the module may have been damaged. After resetting, the problem might persist. Common causes include excessive motor cable length leading to arcing, high output leakage current due to improper cable selection, or loose connections and increased load current from damaged cables. If a small-capacity inverter (7.5G11 or less) has a short-circuited 24V fan power supply, it can trigger an OC3 alarm. In this case, the main board’s 24V fan power supply is likely damaged, while other functions remain normal. If “1, OC2†appears followed by “OC3†after power-on, the motherboard may be faulty. Pressing the RUN button and seeing “OC3†indicates a faulty drive board. (2) Schneider Inverter OLU Alarm: The inverter is overloaded. When the G/P9 series triggers this alarm, you can try adjusting parameters like torque boost, acceleration/deceleration time, and energy-saving settings. Next, use a clamp meter to check the inverter's output. If it's too high, consider using an oscilloscope to inspect the upper-left detection point on the motherboard to determine if the motherboard is damaged. (3) Schneider Inverter OU1 Alarm: Overvoltage occurs during acceleration. When an "OU" alarm appears, first check if the cable is too long or if the insulation is aged. Also, verify if the DC link electrolytic capacitor is damaged. For large inertia loads, consider motor online self-tuning. Use a multimeter to measure the DC bus voltage at startup. If the reading differs from the operation panel display, the main board’s detection circuit is likely faulty and needs replacement. If the DC bus voltage exceeds 780VDC, an OU alarm will occur. If it drops below 350VDC, a LU undervoltage alarm will trigger. (4) LU Alarm: Undervoltage. If the device frequently shows a "LU undervoltage" alarm, try initializing the inverter’s parameters (after setting H03 to 1), then increase the carrier frequency (parameter F26). If the E9 device continues to show a LU alarm and cannot reset, the driver board may be faulty. (5) EF Alarm: Short circuit to ground. In G/P9 series inverters, this could indicate a faulty main board or Hall element. (6) Er1 Alarm: Memory abnormal. For G/P9 series inverters with "ER1 does not reset," remove the FWD-CD short circuit, power on, and press the RESET button until the LED 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: Self-tuning failure. In G/P11 series inverters, this often points to a damaged charging resistor (for small-capacity units) or an open contactor (for larger models like 30G11 or higher when under load). Check if the contactor’s auxiliary contacts are properly connected. If the contactor doesn’t engage, check the 1A fuse on the board and ensure the two core signals sent to the motherboard are normal. (8) Er2 Alarm: Panel communication error. This usually indicates a main board issue, especially when a 24V fan power supply is shorted in 11kW or higher inverters. For E9 series machines, the DTG component on the display panel is often damaged, which can also damage the motherboard. Replacing the panel may result in an immediate OC alarm. For G/P9 models, an ER2 alarm after power-on suggests a failed capacitor on the drive board. (9) OH1 Overheat Alarm: Heat sink overheating. OH1 and OH3 are similar signals, detected randomly by the CPU. OH1 detects the bottom plate, while OH3 detects the main board. Both signals are combined and sent to the CPU. When OH1 occurs, check ambient temperature, cooling fan functionality, and whether the heat sink is clogged (common in food processing or textile environments). In constant pressure water systems using an 800Ω potentiometer, the potentiometer should be at least 1kΩ. Incorrect wiring of the potentiometer’s movable end can also cause this alarm. If the 220V fan in a large inverter (30G11 or higher) doesn’t turn, an overheat alarm is inevitable. Check the FUS2 fuse (600V, 2A) on the power supply board. When OH3 occurs, it usually means a small capacitor on the drive board has failed due to overheating, causing three-phase output imbalance. Therefore, when "OH1" or "OH3" appears, first check if the inverter’s three-phase output is balanced. For OH overheating alarms, there is also a possibility of a motherboard or electronic thermal sensor malfunction. The G/P11 series uses an analog signal for its thermometer, while the G/P9 series uses a switching signal.
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