Dual-speed/delta connection two-speed motor control line - Solutions - China Power

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The control circuit of the dual-speed/delta connection two-speed motor is shown in Figure 21302.

The control line of the double-star/delta connection two-speed motor is basically the same as the reversible control line described above. Therefore, the wiring diagram is omitted in Figure 21302, and the principle is not analyzed in detail. Only some of the special places are explained as follows.

1) Parallel connection of two series of normally open contacts KM2, KM3 at both ends of the SB2 normally open button is to make the contactors KM2, KM3 work at the same time, the two contactors, if one contactor is not closed , the other contactor will be disconnected because it cannot be self-locking.

2) Several reversible control lines as described above can be used with a slight modification: a two-speed motor with double star/delta connection, and a double triangle/star, dual star/double star connection that will be described later. Speed ​​motor. Interested readers can experiment on their own.

3) After the wiring is completed and the inspection is correct, the two speeds should be tested separately. If the rotation directions of the two speeds are inconsistent, any two power cables in KM1 or KM2 can be reversed. This process is generally referred to as "phase modulation."

4) In Figure 21302 and the control lines of the remaining multi-speed motors, only one thermal relay is drawn. If the rated current of the motor is different when considering various speeds, one of the two speeds can be overload protected by a thermal relay. The normally closed contacts of the two thermal relays are respectively connected in series in the corresponding contactor coil circuit.