Fuji inverter common alarm corresponding fault cause analysis - Database & Sql Blog Articles

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1. OC alarm (addition, subtraction, over-current at constant speed) For short-time high-current OC alarm, under normal circumstances, the current detection circuit of the drive board has a problem, and the module may have been impacted (damaged), resulting in possible After the reset, the fault continues to occur. The reason is basically the following: the motor cable is too long, the output leakage current caused by the cable selection criticality is too large, or the output cable connector is loose and the load current caused by the cable damage is increased. Arc effect. In the years of Fuji inverter maintenance experience, the small capacity (7.5G11 and below) inverter 24V fan power supply will also cause OC3 alarm when the short circuit occurs. At this time, the 24V fan power supply on the motherboard will be damaged, and other functions of the motherboard are normal. If the “1, OC2” alarm appears and cannot be reset or the “OC3” alarm is displayed when power is turned on, there may be a problem with the motherboard; if the “OC3” alarm is displayed by pressing the RUN button, the drive board is damaged.
Second, OLU alarm (inverter overload) When the G/P9 series inverter has this alarm, it can be solved by three methods: first modify the parameter settings of “torque boost”, “acceleration/deceleration time” and “energy-saving operation”. Secondly, it is used to measure whether the output of the inverter is really too large; then 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.
Third, OU1 alarm (overvoltage when accelerating) When the general-purpose inverter has an "OU" alarm, first consider whether the cable is too long, whether the insulation is aging, whether the electrolytic capacitor of the intermediate link of the DC is damaged, and at the same time, it can be considered for the large inertia load. The online auto-tuning of the motor. In addition, the intermediate DC link voltage is measured with a multimeter at startup. If the display instrument display voltage is different from the LCD display voltage 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 do OU alarm; when it is lower than 350VDC, the inverter will do the undervoltage LU alarm. In the past, this problem was also encountered in the maintenance of Siemens inverters.
Fourth, LU alarm (undervoltage) If the equipment often "LU under voltage" alarm, you can consider initializing the parameters of the inverter (H03 is set to 1 and confirm), and then increase the carrier frequency of the inverter (parameter F26). If the E9 device LU is under voltage alarm and cannot be reset, there is a problem with the (power) driver board.
5. EF alarm (short circuit to ground fault) When this alarm occurs in G/P9 series inverter, the main board or Hall element may be faulty.
Sixth, Er1 alarm (memory abnormality) About G/P9 series inverter "ER1 does not reset" fault processing: Remove FWD-CD short circuit, power on, keep pressing RESET button to power off, know LED power indicator is off Then let go of the power; then re-power on, see if the "ER1 does not reset" fault is removed, if it can not be removed by this method, it means that the internal code has been lost, then you need to change the motherboard.
7. Er7 alarm (defective self-tuning) When this fault alarm occurs in the G/P11 series inverter, the charging resistor is usually damaged (small-capacity inverter). The other is to check whether the internal contactor is closed (30G11 or larger large-capacity inverter, and the inverter will alarm when the inverter carries the output), whether the contactor's auxiliary contact is in good contact; if the internal contactor does not pick up, it can be checked first. Is the 1A fuse on the engine board damaged? It may also be a problem with the driver board, which can check whether the two core signals sent to the motherboard are normal.
Eight, Er2 alarm (panel communication abnormal) 11KW or more inverter This alarm will occur when the 24V fan power supply is short-circuited (main board problem). For the E9 series machine, the DTG component of the display panel is generally damaged. When the component is damaged, the motherboard will be damaged. The OC alarm is displayed immediately after the power is turned on after replacing the display panel. When the G/P9 machine is powered on and the "ER2" alarm is displayed, the capacitor on the drive board is disabled.
OH1 overheat alarm (heat sink overheating) OH1 and OH3 are essentially the same type of information, which is randomly detected by the CPU. OH1 (detecting the bottom plate part) and OH3 (detecting the main board part) analog signals are connected in series and then sent to the CPU, and the CPU Randomly report any of the faults. When the “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 clogged (such alarms appear in food processing and textile applications). If the constant voltage water supply is used and the analog quantity is used, this fault is usually caused when using the 800Ω potentiometer; the capacity of the given potentiometer should not be too small, not less than 1kΩ; the active end of the potentiometer will also be wrong. Call the police. If the 220V fan of the large-capacity inverter (30G11 or higher) does not turn, an overheat alarm will occur. At this time, check whether the fuse FUS2 (600V, 2A) on the power supply board is damaged. When the “OH3” alarm occurs, it is usually that the small capacitor on the engine board fails due to overheating. The result of the failure (symptom) is the three-phase output imbalance of the inverter. Therefore, when the inverter shows “OH1” or “OH3”, you can first check the inverter to check whether the three-phase output of the inverter is balanced. For OH overheating alarms, the possibility of a motherboard or electronic thermal meter malfunctioning also exists. The G/P11 series inverter electronic thermometer is an analog signal, and the G/P9 series inverter electronic heat meter is a switching signal.
10. OH2 alarm and OH2 alarm For G/P9 series machines, because there is an external alarm definition (E function), when this external alarm definition terminal has no shorting tab or the shorting piece is used in virtual connection, it will cause OH2. Alarm; if the CN18 plug-in on the main board (the heater plug for detecting temperature) is loose at this time, it will cause "1, OH2" alarm and cannot be reset. After the check is completed, you need to power on again to reset.
11. Low-frequency output oscillation fault When the inverter is in low-frequency output (below 5Hz), the motor output is frequently pulsating in the forward/reverse direction, usually the motherboard of the inverter has a problem.
12. An acceleration interval oscillation fault When the inverter appears in the low-frequency three-phase unbalance (expressing motor oscillation) or oscillates within an acceleration interval, you can try to modify the carrier frequency (lower) of the inverter, which can be solved most of the time. this problem.
Thirteen, running no output fault This fault is divided into two situations: First, if the LCD display shows the output frequency and voltage rise after the inverter is running, and the measured output has no voltage, the drive board is damaged; second, if the inverter runs The LCD display shows that the output frequency and voltage are always at zero, which is a problem with the motherboard.
14. The running frequency does not rise. When the inverter is powered on, press the RUN button, the running indicator lights up (when the keyboard is operated), but the output frequency always shows “0.00” does not rise. Usually, the driver board has a problem. The problem can be solved by driving the board. If the inverter can rise to the set frequency when no-load operation, and stay at 1Hz when the load is on, it is because the load is too heavy, the inverter's “instantaneous over-current limit function” works, and then the parameters are modified. Solve; such as F09 → 3, H10 → 0, H12 → 0, after modifying these three parameters can generally return to normal.