| 摘要 |
PURPOSE:To reduce the load for a motor and prevent the temperature rise of the motor by operating an unloader mechanism so that the electric conduction for the motor is suspended and the inertia revolution of the motor is permitted, when the pressure in an air tank becomes equal to a set pressure. CONSTITUTION:When a motor 2 operates, an air compressor 3 is operated. When a pressure sensor 12a detects the pressure in an air tank, a control device 12 is turned-OFF by the detection signal, and a solenoid valve 10 is turned-ON and opened. Therefore, the compressed air in the air tank operates an unloader mechanism 7, and the suction valve of the air compressor 3 is opened to start the starting unload operation. While, if the detection pressure of the pressure sensor 12a reaches a set pressure, a controller 12 is turned-OFF, and the solenoid valve 10 is turned-ON, and the unloader mechanism 7 is operated, and the motor 2 is stopped. Since the motor 2 is revolved by inertia for a prescribed time in this case, a fan revolves to cool the motor 2.
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