Category:power

Question:
a three-phase asynchronous motor, the two control.

which teachers are able to give a sketch?谢谢.

Answer:
I just drew a control loop, the main circuit is very simple, three-phase power supply in turn through the main switch, insurance, contact the main AC contactor, thermal relay main contact, the electric motor.
FU for insurance. SB1, SB2 as a combination of buttons in a way. SB3, SB4 for another combination of buttons in one place. KM for the exchange of contactor coils. KM1 contactor normally open for the exchange of contacts. FR for the thermal relay normally closed contact.
Annex:

Answer:
the following change about this map and see okay.
one will be replaced by single-phase 380-volt power supply. (because the AC contactor line package is 380 volts power supply)
2. will be replaced by three-phase AC contactor bulb line package. (three-phase contact of course, is to control the motor in).
so that you can freely control in both the three-phase motor. (but your motor If too much. necessary to compensate for device operation does not. For the average motor is no problem).