Digital intelligent motor soft starter starting method

The digital intelligent motor soft starter has a variety of starting and stopping methods. Users can choose the appropriate mode according to the load and specific use conditions. 

Starting methods:

current limit start, voltage ramp start, current ramp start;

Stopping methods:

free stop, soft stop, brake stop, soft stop + brake stop.

1. Current limiting soft start

When using this mode, the ramp time is set to zero. After the soft starter gets the starting command, its output voltage increases rapidly until the output current reaches the set current limit value Im, and the output current does not increase any more. After the motor runs and accelerates for a period of time, the current begins to decrease, and the output voltage increases rapidly until the full voltage is output, and the starting process is completed.

2. Voltage ramp start

This starting method is suitable for large inertia loads. For occasions with high requirements on starting stability, the starting shock and mechanical stress can be greatly reduced.

3. Current ramp start

After the soft starter gets the start command, the output current rises steadily with the set ramp time, while the output voltage increases at a certain rate. When the starting current increases to the limit value Im, the current remains constant until the starting is completed. When starting with light load, the starting current is relatively stable, avoiding the oscillation of the motor.

4. Kick voltage + torque soft start

This method is mainly applied to the load motor with relatively large static resistance, by applying an instantaneous large starting torque to overcome the large static friction torque. In this mode, the output voltage quickly reaches the set kick voltage. After reaching the preset kick time, it will start smoothly according to the set starting voltage, starting current and ramp time until the starting is completed.

When using this mode, it must be used in conjunction with other soft-start methods, and the value of kick voltage and kick time must be set.

5. Free stopping

When the soft stop time (C007) and the braking time (C009) are set to zero at the same time, it is the free stop mode. When the soft starter receives the stop command, the soft starter blocks the control relay of the bypass contactor and immediately blocks the output of the main circuit thyristor, and the motor freely stops according to the load inertia.

6. Soft stopping

In full pressure state, when the soft stop time is not set to zero, the stop is soft stop. In this mode, the soft starter first disconnects the bypass contactor, and the output voltage gradually drops to the set soft stop termination voltage value within the set soft stop time. When the soft stop process is over, the starter turns to the braking state (the braking time is not zero) or coasts to stop.

7. Brake Stopping

When the soft starter sets the braking time and selects the braking time relay output, after the soft starter responds to a valid stop command under full voltage, it will directly enter the braking process if there is no soft stop process. The braking process can only be entered after the soft stop is completed. The output signal of the brake time relay remains valid during the stop (brake) time. Use the output signal of this time relay to control the external brake unit or the electrical control unit of the mechanical brake.

8. Soft stop + brake stopping

When the soft starter sets the soft stop time and the braking time, the soft starter first disconnects the bypass contactor, and the output voltage gradually drops to the set soft stop termination voltage value within the set soft stop time. After the soft stop process is over, the brakes are applied within the specified braking time.

Xichi CMC-HX motor soft starter has a variety of starting and stopping methods.

Voltage exponential curve, voltage linear curve, current exponential curve, current linear curve, and programmable kick starting torque and starting current limit can be applied in each mode. According to different loads, the corresponding starting curve can be selected to achieve the ideal starting effect.

Programmable soft parking, free parking, braking, pump stop and other parking methods. The basic algorithm makes the motor start and stop more accurate and smooth.