1. The inverter can not speed up the frequency increase when it starts with load
The 1366S-BR 040 inverter carries a load of 37 kW fan motors. During the trial operation, it was found that the inverter could not speed up the frequency increase normally, and the HIM display was speeding up. The inverter only swings at 1-4 Hz, and the motor hums loud and small, but in the end it cannot be accelerated to the set frequency. Disconnect the connection between the inverter and the motor, and the acceleration and deceleration of the inverter are normal during no-load test operation. The analysis is that it is caused by the insufficient starting torque of the inverter, when the U/factory ratio of the inverter is too small, and the voltage output to the motor at low frequency is very low, in order to reach the necessary starting torque, the current must be increased, and the excessive increase of the current makes the stall maintenance action, and then restricts the upswing, so it cannot start normally [1].
Change the starting curve setting, select the starting curve with the starting initial voltage value, and set the "run boost" and "start boost" to 6V and 10V respectively, that is, the torque is compensated at low frequency. Everything works fine after restarting.
2. The DC circuit trips with overvoltage when the inverter starts
AEG Multiverter 122/150-400 drives do not overvoltage trips every time they start. When checking, it was found that when the inverter was powered on in the main circuit but there was no closing signal, the DC circuit voltage reached 360V. The positive pole of the DC circuit of this type of inverter is connected in series with a contactor, and it is engaged after the pre-charging process when there is a closing signal, so it is suspected that the IGBT function of the pre-charging circuit is poor, and the IGBT of the pre-charging circuit is disconnected, and the situation is still the same. When the output end of the inverter is viewed with a multimeter, its resistance to the ground is very small, and it is found that the motor junction box is wet by lye, and the inverter works normally after finishing and drying.
Because the motor junction box is wet by lye, the leakage current to the ground of the negative pole of the DC circuit is charged to the capacitor of the DC circuit through the freewheeling diode in the junction box and the inverter inverter. The output voltage and frequency of the inverter are gradually increased when starting, and after the motor is wet by the lye, the rate of change of the output current will be very high, and then the DC circuit will be overvoltaged.
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