WEG NEMA Low Voltage Electric Motor Installation and Maintenance Manual

About this manual

The WEG Installation and Maintenance Manual covers the proper procedures for installing, starting, and maintaining three‑phase and single‑phase asynchronous squirrel‑cage induction motors (frame sizes 140T‑580T). It includes safety instructions, delivery and storage handling, mechanical and electrical installation steps, and start‑up checks.

Key sections address mechanical aspects such as foundation, alignment, and coupling, electrical aspects like feed systems and motor protection, routine maintenance (cleanliness, lubrication, bearing replacement), troubleshooting charts, and a detailed spare‑parts list with part numbers.

What's inside

• Introduction
• Safety Instructions
• Delivery and Storage
• Mechanical Installation
• Electrical Installation
• Start‑up Procedures
• Maintenance
• Troubleshooting
• Spare Parts and Component Terminology

Specifications

Frequently asked questions

What safety steps must be taken before performing maintenance on the motor?

All power sources must be disconnected, personnel should avoid contact with energized circuits or rotating parts, and fire‑fighting and first‑aid equipment must be visible and accessible.

How often should a motor in storage be inspected or rotated?

Motors stored for long periods should have their shafts manually rotated every three months, and periodic inspections are recommended in humid conditions.

What clearance is required around a motor for proper ventilation?

The motor should be placed at least 50 cm from any wall, and the installation must allow an air flow of about 700 cfm per 75 HP motor.