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Because of the inertia of the load's bigger, the speed of the inverter is shorter, which leads to the starting trip; the static friction force of the load is big, and the starting torque is big. The characteristics of the starting over-current trip is: it does not trip at the re-start, but the trip during acceleration. In the starting process, the trip can be solved by setting parameters.

Firstly, confirm that the GD200A input power supply is normal, and observe that the input voltage is normal during operation. If a UV fault is reported during operation for models above 55kW, and it is obvious that the DC bus voltage drops. Then we need to start from the following two aspects:
1. The fan may cause a short circuit, check the fan. Please disconnect the fan, then try to test. You will find there is a cable between fan and auxiliary power board, please take out that cable. Then try to check the problem happen or not. If not happen, that means fan need to replace.
2. Listen to whether there is a sound of contactor closing when starting, if not, replace the contactor and check 24 V power board.

The minimum working voltage of 380V inverter switching power supply is 250V, We usually do not recommend using 220 V power supply to power on the 380V drive, because it will report undervoltage fault and can not run. Therefore, it is necessary to reduce the under voltage protection point in group P29, turn off the power failure and frequency reduction, and adjust the voltage points of over-voltage stall and energy consumption braking. VF control may not be a problem, if vector control is used, the performance may be reduced; the input and output current should not exceed the current marked by the original inverter.That is to say, the power should be reduced, need to derate the drive. If it is necessary to use this way in an emergency, please contact the INVT technical engineer.

In the process of deceleration or stop of the inverter, due to the set deceleration time is too short or the braking capacity is not enough, the bus voltage inside the inverter is increased and protection (also known as overvoltage stall) occurs. As a result, the inverter loses the speed control of the motor. At this time, a long deceleration time should be set to keep the bus voltage in the transformer from rising too high to realize normal deceleration control. In the process of increasing speed of inverter, the set acceleration time is too short or the load is too heavy, and the grid voltage is too low, which leads to the converter over-current and protection (also known as over-current stall). When the inverter loses the speed control of the motor, a longer speed up time should be set to maintain no over-current and realize normal speed-up control.

The acceleration time is too short, or the motor load is too heavy, or the motor is stuck, please check above.

The DC reactor is located between the rectifier bridge and the capacitor to reduce the harmonic components in the input current, and reduce the surge current, so it can improve the power factor of the inverter. INVT GD20/GD350 series 18.5~110kW already built-in DC reactors, other series need to be equipped with external ones.

The output waveform of the inverter is not a sine wave, but a PWM pulse wave. The output reactor can reduce the output harmonic, reduce the instantaneous high voltage generated when the IGBT works, and reduce the adverse effect on the insulation of the motor. The output reactor also can reduce the capacitance effect of the long cable at the output end of the inverter, avoid overcurrent of the inverter and increase the transmission distance. It is recommended that the output cable length exceeds 50m, select the suitable output reactor refer to operation manual.

Download the INVT Workshop or INVT Studio software on the INVT official website, connect the RS485 port of the inverter through a USB-RS485 adapter, and use the default communication parameters to connect.

Overheating is a common fault. When faced this kind of situation, we will first think about whether the cooling fan is running, whether the fan is blocked, whether the ambient temperature is too high, the inverter is not well ventilated, and the temperature detection circuit has problem.