WEG MGW - User Manual

Motors I Automation I Energy I Transmission & Distribution I Coatings
Low and high voltage three phase
induction motors
M line - Squirrel cage rotor - Vertical
Installation, Operation and Maintenance Manual

WEG MGW Specifications

General

Insulation Class	F
Frame Size	63 to 355
Number of Poles	2, 4, 6
Voltage	220/380V, 380/660V
Frequency	50 Hz / 60 Hz
Protection Degree	IP55
Construction	Aluminum frame
Efficiency	IE1

Summary

1 Introduction

1.1 Safety Warnings in the Manual

Manual safety warnings symbols for Danger, Attention, and Note with their implications.

2 General Instructions

2.1 Qualified Personnel

Definition and requirements for personnel authorized to perform motor tasks.

2.2 Safety Instructions

General safety warnings for motor operation and installation procedures.

2.6 Voltage and Frequency

3 Receiving, Handling and Storage

3.2 Handling

Guidelines and precautions for safe lifting and moving of motors.

3.3.3.9 Inspections and records during storage

3.3.3.11 Maintenance plan during storage

3.3.4 Preparation for commissioning

4 Installation

4.2 Shaft Lock

Procedures for shaft locking device removal and installation.

4.4 Insulation Resistance

4.4.1 Safety Instructions

Safety precautions for measuring insulation resistance.

4.4.7 Insulation assessment

4.5 Protections

4.5.1 Thermal protections

Overview of over-temperature protection devices.

4.5.1.1 Temperature limits for the windings

4.5.1.2 Alarm and trip temperatures

4.6 Cooling

4.6.1 Air-water heat exchange cooling

4.7 Electrical Aspects

4.7.1 Electrical connections

Instructions for connecting main cables and accessories.

4.7.1.1 Main electrical connections

Connecting main power supply cables to the motor.

4.7.1.2 Grounding

Procedures for grounding the motor frame and terminal box.

4.7.2 Connection diagrams

4.7.2.1 Connection diagrams according to IEC60034-8

Terminal identification and connection diagrams per IEC standards.

4.7.2.2 Connection diagrams according to NEMA MG1

4.7.2.3 Rotation direction

4.8 Mechanical Aspects

4.8.3 Motor mounting

Procedures for securely mounting the motor.

4.8.6 Leveling

4.8.7 Alignment

4.8.8 Hollow shaft motor alignment

4.8.10 Couplings

4.8.10.1 Direct coupling

4.8.10.3 Belt drive

5 Starting

5.1 Direct On-Line Starting

Method, requirements, and implications of DOL starting.

6 Commissioning

6.1 Preliminary Inspection

Checklist of items to inspect before first motor start.

6.2 First Starting

Step-by-step procedure for the initial motor start.

6.3.2 Temperatures

6.3.3 Bearings

6.3.5 Vibration

6.3.6 Shaft vibration limits

6.3.7 Shutdown

7 Maintenance

7.1 General

7.4 Cooling System Maintenance

7.6 Vibration

7.9.1 Grease-lubricated rolling bearings

7.9.1.1 Instructions for lubrication

7.9.1.5 Alternative greases

7.9.1.6 Procedure for changing the grease

7.9.1.8 Grease compatibility

7.9.1.9.2 Lower bearing disassembly

7.9.1.9.3 Upper bearing disassembly

7.9.1.10 Bearing assembly

7.9.2.1 Lubrication instructions

7.9.2.3 Oil change

7.9.2.4 Bearing operation

7.9.2.5 Bearing disassembly

7.9.2.6 Bearing assembly

7.9.4.4 Oil change

7.9.4.6 Sleeve bearing operation

7.9.4.7 Sleeve bearing maintenance

7.9.5 Bearing protection

7.9.5.1 Protection settings

8 Motor Disassembly and Assembly

8.2 Disassembly

8.5 Tightening Torque

8.6 Spare Parts

9 Maintenance Plan

10 Abnormalities, Causes and Solutions

Table 10.1: Basic list of abnormalities, causes and corrective actions

List of common motor abnormalities, their causes, and corrective actions.

14 Warranty Term