Fuji Electric fault codes and how to deal with them

Create Date: 2024-8-30 12:03:23|Source: Fuji Electric/Fujielectric

Fuji Electric inverter inverter fault code fault code fault after the corresponding treatment method is given.
Fuji Electric fault codes and how to deal with them
  OC alarm.

Keyboard board LCD display: add, subtract, constant speed overcurrent.

For OC alarms with large currents in a short period of time, under normal circumstances, there is a problem with the current detection circuit of the driver board, and the module may also be shocked (damaged), and the fault may continue to occur after reset. The reasons are basically as follows: the arc effect caused by the increase in load current caused by the long motor cable, the critical cable selection or the output cable joint is loose, and the load current rises due to cable damage.

When the 24V fan power supply of the inverter is short-circuited, the small capacity (below 7.5G11) will also cause 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 there is an alarm of 1 or OC2 and it cannot be reset, or the alarm of OC3 is displayed as soon as it is powered on, it may be that there is a problem with the motherboard; If the OC3 alarm is displayed when you press the RUN button, the driver board is broken.

OLU alarm.

Keyboard Pad LCD Display: Inverter Overloaded.

When this alarm occurs in the G/P9 series inverter, it can be solved by three methods: firstly, modify the parameter settings of torque lifting, acceleration and deceleration time and energy-saving operation; Secondly, use a card meter to measure whether the output of the inverter 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 is damaged.

OU1 alarms.

Keyboard Pad LCD Display: Overvoltage during acceleration.

When the OU alarm occurs in the general inverter, the first thing to consider is whether the cable is too long, whether the insulation is aging, and whether the electrolytic capacitor in the intermediate link of DC is damaged. At the same time, in-line self-tuning of motors with large inertia loads can be considered. In addition, a multimeter is used to measure the voltage in the intermediate link of the DC at start-up. If the display voltage of the measuring instrument is different from the LCD display voltage of the operation panel, the detection circuit of the motherboard is faulty and the motherboard 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 undervoltage LU alarm.

LU alarm.

Keyboard pad LCD display: undervoltage.

If the device frequently under-voltage alarm, you can consider initializing the parameters of the inverter (confirmed after H03 is set to 1), and then increasing the carrier frequency of the inverter (parameter F26). If the E9 device LU undervoltage alarms and cannot be reset, there is a problem with the (power) driver board.

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