Confirm Power Supply and Motor Parameters: First, confirm the voltage (usually 380V or 220V) and frequency (50Hz or 60Hz) of the three-phase power supply, ensuring they match the rated voltage and frequency of the geared motor. This step is crucial; otherwise, motor damage or malfunction may occur.
Identify Motor Terminals: Three-phase geared motors typically have six terminals in their junction box, labeled U1, V1, W1 and U2, V2, W2. These terminals are used to connect the power supply to the motor's three-phase windings.
Select Wiring Method: Three-phase motors have two common wiring methods-star (Y) connection and delta (Δ) connection.
Star Connection: Short-circuit U2, V2, and W2, and connect the power lines to U1, V1, and W1 respectively. This connection is suitable for low-voltage starting, with lower current but also lower torque.
Delta Connection: Short-circuit U1 with W2, V1 with U2, and W1 with V2 respectively. Connect the power supply wires to U1, V1, and W1. This connection is suitable for high-torque starting, but draws a larger current.
Connecting the Power Supply Wires: According to the selected wiring method, connect the three phase wires (L1, L2, L3) of the power supply to the corresponding motor terminals. Ensure the wiring is secure to avoid loose connections that could lead to poor contact or overheating.
Grounding Protection: Connect the motor's grounding terminal (usually marked PE or a ground symbol) to the power supply's ground wire for safety.
Test Run: After wiring, perform a jog test to observe if the motor rotation is correct. If the rotation is reversed, you can swap the positions of any two power supply wires to adjust the rotation.