The reasons for the non-automatic conversion of the soft starter are as follows: It is because the torque provided during soft start cannot meet the demand of the torque of the equipment being dragged. The voltage during startup gradually increases and the torque provided by the motor meets the demand of the equipment, so the motor starts to rotate. Solution If the power supply allows, appropriately increase the soft start set starting current multiple; Or the purchase of soft starter has special functions, that is, it can solve the equipment needs to start with large torque requirements and at the same time can enter the soft start state. Soft starting is the use of voltage regulation starting mode, because the voltage is gradually added, so when the voltage is lower than a certain value due to the static resistance moment, the maximum output of the motor can not overcome the resistance moment, so the motor does not turn (blocked), because of the current, so emit a large current sound. When running with power frequency, the motor can produce enough torque to overcome the resistance moment, so it can operate normally. Increase the starting current parameter value! General pump, fan and other loads, please close the outlet valve or inlet damper can start.

Use voltage mode to start, set the start time, after reaching the start time, no matter whether the motor starts normally will switch. If this time is just when the motor current Z is large, then the AC contactor load when switching is very large, pull the arc, serious will burn the contactor. The common situation is the voltage drop when the motor starts, resulting in too low voltage, bypass contactor in the switching voltage is not enough, resulting in bad contact and affect the normal start. The solutions are: A. Extend the startup time, such as 30 seconds instead of the default 16 seconds; B. Change the start mode and use the current limiting start mode to limit the current within 300% or 400% of the rated current. The starting process of the soft starter in current limiting mode is as follows: after pressing the start button, the current will slowly rise from 0 and will not rise again after reaching the limit. With the motor speed getting faster and faster, when the rated speed is reached, the current will drop below the rated current. At this time, the bypass contactor will switch and complete the starting process.

Solution that the soft starter does not switch bypass.

1. If the power supply is faulty, check whether the side of the bypass control terminal of the soft starter has voltage and the side of the contactor is reliably connected to the neutral line. Eliminate the above power supply problems.

2. The soft starter relay is faulty. In the state of power off and shutdown, remove the connection to the bypass control terminal of the soft starter, and then send power to start the motor. After starting, use a multimeter to switch to the resistance gear to detect whether the bypass control terminal is closed.

3. Contactor problem, when the contactor failure, will not suction

4.In addition, if the soft starter is not started, the bypass contactor will not pull. Whether the start of the soft starter is completed can be judged by the running state of the soft starter and the current state of the motor.

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