How to Connect Power to a Two-speed Motor

Two-speed motors usually have two common wiring methods, namely the △/YY (delta/double-star) connection and the Y/YY (star/double-star) connection. The following are the specific wiring steps and related explanations for these two connection methods:

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### △/YY Connection
- **Wiring Preparation**: A two-speed motor has six outgoing terminals, marked as U1, V1, W1, U2, V2, and W2 respectively. You need to prepare electrical components such as the main circuit breaker, contactors, thermal relays, as well as connecting wires.
- **Low-speed △ Connection**
- Connect U1, V1, and W1 to phases L1, L2, and L3 of the three-phase power supply respectively.
- Short-circuit U2, V2, and W2, that is, connect these three terminals together with a wire to form a delta connection. At this time, the motor runs at a low speed.
- **High-speed YY Connection**
- Disconnect the short-circuit connection of U2, V2, and W2 during low-speed operation.
- Connect U2, V2, and W2 to one end of the three normally-open contacts of the contactors respectively. The other ends of the three normally-open contacts of the contactors are connected to phases L1, L2, and L3 of the three-phase power supply respectively.
- At the same time, short-circuit U1, V1, and W1 together to form a double-star connection. At this time, the motor runs at a high speed.

#### Y/YY Connection
- **Wiring Preparation**: Similarly, there are six outgoing terminals U1, V1, W1, U2, V2, and W2 of the two-speed motor, as well as the electrical components and wires required for the main circuit.
- **Low-speed Y Connection**
- Connect U1, V1, and W1 to phases L1, L2, and L3 of the three-phase power supply respectively.
- Connect U2, V2, and W2 together to form a star connection. At this time, the motor is in a low-speed operation state.
- **High-speed YY Connection**
- First, disconnect the connection point of U2, V2, and W2 during low-speed operation.
- Connect U1, V1, and W1 to one end of the three normally-open contacts of the contactors respectively. The other ends of the three normally-open contacts of the contactors are connected to phases L1, L2, and L3 of the three-phase power supply respectively.
- Then connect U2, V2, and W2 to one end of the other three normally-open contacts of the contactors respectively. The other ends of the three normally-open contacts of these contactors are short-circuited together to form a double-star connection, and the motor switches to high-speed operation.

During actual wiring, in order to ensure the normal operation and safety of the motor, the following points should also be noted:
- Make sure the power supply is cut off before wiring to avoid the risk of electric shock.
- Wire according to the markings and requirements on the motor nameplate to ensure correct wiring.
- Select the cross-sectional area of the connecting wire according to the power and current of the motor to ensure that the wire can withstand the current during the motor's operation.
- Reasonably install and connect protection components such as thermal relays to protect the motor from overload, short-circuit, etc.
- After wiring is completed, carefully check whether each wiring terminal is secure, whether there are any loose connections or short circuits. After confirming that everything is correct, connect the power supply for debugging.

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