What Do UVW Terminals On A Generator Indicate?

What Do UVW Terminals On A Generator Indicate?

UVW Terminals on a Generator

Represent the three-phase AC winding terminals, typically used for either Star (Y) or Delta (Δ) connections. The specific connection method should be chosen based on the motor's power and requirements, while paying attention to phase sequence and insulation safety.

Wiring Principle

Definition of UVW: U, V, and W are the identifiers for the three-phase winding terminals, corresponding to the three phases (L1, L2, L3) of the power supply.

 Connection Methods

Star Connection (Y): Connect the three tail ends U2, V2, W2 to form a neutral point, and connect the live wires from the power supply to U1, V1, W1 respectively. This is suitable for light loads or scenarios with low starting current.

Delta Connection (Δ): Connect the terminals in series (U1 to W2, V1 to U2, W1 to V2), and connect the live wires from the power supply to these junction points. This is suitable for heavy loads or scenarios requiring high torque.

Wiring Steps

Identify Terminals: The terminal box contains U1, V1, W1 (start points) and U2, V2, W2 (end points). Confirm the identification sequence.

Select Connection Method:

For Star: Connect U2, V2, W2 together; connect live wires to U1, V1, W1.

For Delta: Connect U1 to W2, V1 to U2, and W1 to V2; connect live wires to these junction points.

Safe Operation: Perform all work after cutting off the power supply. Use insulated tools and ensure all screws are securely tightened.

Precautions

Phase Sequence Matching: The power supply phase sequence must match the indication on the motor's nameplate to prevent reversal or damage.

Insulation Safety: Check the insulation of wires and terminals before operation to prevent short circuits or electric shocks.

Secure Connections: Ensure all connection points are firm and reliable to avoid local overheating caused by loose contacts.

Compliance with Specifications: Strictly follow the wiring diagrams and instructions provided by the generator manufacturer.

Power Adaptation: High-power motors (e.g., above 7.5 kW) are typically configured in a Delta connection by default.

Resistance Testing: The resistance between windings must be measured prior to wiring to ensure there is no short circuit or open circuit.