QJX2 series star delta motor starter

Large power motor starting current is very big, in order to avoid the impact of large current on the line, the motor angle method is changed to start with a certain inertia, the rotation speed of a certain inertia, then turn to the angle of the start, the starting current of the 1/3. From 3 contacts, 1 time relay and button.

QJX2 series star delta starter (hereinafter referred to as starter), is suitable for AC 50Hz or 60Hz, rated insulation voltage of 660V (690V), the AC-3 type of three-phase squirrel cage induction motor with rated working voltage of 380V, power 80KW, and the following is used to control the stator winding from “Star” to “triangle” for starting and stopping. After assembling the thermal relay of the corresponding specification, the overload protection of the motor and the related circuit can be protected.

The starter and QJX4, LC3-D have the same functional specifications can be equated with the use of.

The function and principle of Starter Motor are respectively:
1, role:
The motor starter is device for auxiliary motor starting, the motor start smoothly, little impact on the grid, but also to achieve the soft parking of motor, brake, overload and lack of protection. The motor starter is mainly used for large motor and asynchronous motor.
2, working principle:
The distance between the plate to the liquid resistance value in the starting process always meet the mechanical property requirements on the on resistance value, thereby causing the motor to obtain the maximum starting torque and the minimum starting current and starting a smooth. Specific work process is: to start the main motor active polar plate in a small power gear system driven by slowly moving, change the distance between the two plates, the string into the rotor circuit of liquid resistance value change meet the above conditions, the motor speed increased. When the distance between the two plates is the minimum, the motor speed of the motor reaches the rated speed, the liquid resistance is short, the starting process is completed, the operation state is transferred.