What are the faults of Yaskawa inverter?

The following are the common faults of the inverter and how to deal with them

1) OC Over Current

This is the most frequent failure of the inverter, and it is divided into external and internal causes in the analysis of causes. External reasons: mechanical structure and parameter setting, open-loop control mainly check whether the load has a short circuit, if it is a frequency converter with multiple motors, it should also be checked separately whether the line of each motor is not well insulated, check whether the mechanical part is stuck (whether the brake is not fully opened), the torque of the motor is too small, the acceleration time is set too short, the upper current limit is set too small and the torque compensation (V/F) is set too high. If it is a closed-loop control, you should also check the line of the encoder, mainly check the insulation to the ground, and whether the encoder is well fixed, if it is observed that the U1-05 has a jump or can not feedback the speed during operation, in addition to considering the encoder itself, it is possible that the PG card is broken. Internal reasons: the detection element of the inverter itself is damaged, and the inverter trips as soon as it is powered on, and it generally cannot be reset at this time. This phenomenon can occur due to damage to the module, damage to the drive circuit (driver board), and damage to the current detection circuit (AC transformer). If this is the case, it is necessary to replace the relevant components

2) OV DC Bus Overvolt Main Loop Overvoltage

The main circuit overvoltage is mainly due to the fact that the braking unit cannot be discharged, the deceleration time is set too short, or the braking unit has been damaged. First of all, we check whether the deceleration time is too short, for large cars, the deceleration time setting of the rotating mechanism should be greater than 6S. Check the brake unit when operating, we can observe the red indicator light on the brake unit, whether it flashes when decelerating and stopping, if it can't flash, we need to check whether the connection line from the brake unit to the brake resistor is open and whether the insulation is good. If there are multiple braking units, it should also be noted that each braking unit is not discharged. If there is a short circuit or a short circuit to the ground in the connection of the braking resistor side, the braking unit has been burned out, and the detection method is to disassemble the braking unit and measure whether the safety inside the braking unit has been burned out, and whether the IGBT has been burned out.

3) OL2 (Inv Overloaded) inverter overload

The main reasons for the overload of the inverter are that the load is too large, the acceleration time is set too short, and we should pay attention to the brakes in the inspection that the brakes may not be opened. The control of the brake of the rotating mechanism is not given by the inverter signal, here we have to pay attention to the inspection of the limit of the rotating foot pedal, if the rotary foot pedal has braked the motor, but has not touched the limit switch, the driver is easy to step on the foot brake and push the handle phenomenon when operating. At this time, the locked-rotor current of the motor will be very large, and it is easy to burn out the IGBT in the inverter if it is done for a long time. This fault can also occur if there is a problem with the connection line from the AC transformer to the driver board in the detection circuit, or if the driver board itself is broken. In the closed-loop control, if the A-B- phase of the encoder is reversed, OL2 will also be reported in the self-learning process.

4) UV1 (DC Bus Undervolt) main circuit low voltage

The main reasons for the low voltage of the main circuit are the damage of one of the rectifier bridges and the abnormal operation of the three thyristors. Or the contactor on the DC bus is damaged, resulting in the DC bus voltage loss on the charging resistor or the failure of the voltage detection circuit may lead to the occurrence of undervoltage faults. If the voltage drop in the terminal is large, this fault will also be reported when the voltage is less than the L2-05 set value.

5) PGO PG Open PG disconnection detection

When the inverter is closed-loop controlled, the speed read out of the encoder cannot be fed back to the inverter, and this fault will be reported, and then we will observe that U1-05 has no speed feedback value. The main causes of this failure are the wire disconnection from the encoder to the PG card, the wrong wiring of the PG card, and the damage of the encoder.

6) OS (Over speed).

When this fault occurs, pay attention to check whether the parameter settings of F1-08 and F1-09 are not in line with the required speed of normal operation. If this is the case, readjust the parameters and then observe the U1-05 and current values. This fault may also be caused by external reasons, if the brake brake is not tight, and the weight pulls the motor to rotate after the handle returns to zero, this fault will also be reported, in this case the brake should be checked.

What are the faults of Yaskawa inverter?

What are the faults of Yaskawa inverter?

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