Cooper QD3 User Manual

Service Information
11
Contents
Safety Information � � � � � � � � � � � � � � � � � � � � � � � � � � � � 2
Product Information � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
Installation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
Part Kit Instructions���������������������������18
QD3/T350 Main Moveable Contact Assembly Kit � � � 19
Kit Number 5741325B04
QD3/T350 Main Moveable Contact Assembly Kit � � � 32
Kit Number 5741325B04
QD3/T350 Motor Replacement Kit ���������������40
Kit Number 57A63675100B
QD3/T350 Motor Resistor Replacement Kit �������46
Kit Number 5791844A01
QD3/T350 PI Drive Cam Replacement Kit ���������49
Kit Number 5740783B21
QD3/T350 Reversing Stationary �����������������51
Contact Assembly Kit Number 5791822A02
QD3/T350 Reversing Moveable Contact and ������60
Neutral Stationary Contact Assembly Kit,
Kit Number 5741325B03
QD3/T350 TC-LTC P.I. Drive Face Gear Kit ��������72
Kit Number 5740787B11
QD3/T350 Quick Drive Holding Switch �����������74
Assembly Kit, Kit Number 574074B04
Voltage Regulators
QD3 Quik-Drive Voltage Regulator
Tap-Changer Manual
S225-12-1
August 2012 • Supersedes 6/09
Figure 1A.
QD3 Tap-changer.
Figure 1B.
QD3 Tap-changer.

Cooper QD3 Specifications

General

Brand	Cooper
Model	QD3
Category	Controller
Language	English

Summary

Safety and General Information

Safety Instructions

General safety precautions, hazard definitions, and competency requirements for operating equipment.

Product Overview

Introduction to the QD3 tap-changer, its motor, and key features.

Tap-Changer Components and Operation

Component Descriptions

Details on motor capacitors, resistors, contacts, switches, housing, and gears.

Drive Mechanism and Operation

Explanation of the drive mechanism and the QD3 operating sequence.

Installation Procedures

Tap-Changer Removal and Separation

Steps to remove the tap-changer from the regulator and separate its assemblies.

Contact Assembly Installation

Procedures for installing main moveable and stationary contact assemblies.

Tap-Changer Re-Assembly

Steps to re-assemble the tap-changer sections.

Maintenance and Component Replacement

Contact Inspection and Torque Requirements

Guidelines for inspecting contacts and applying correct torque values.

Motor and Related Component Replacement

Procedures for replacing the motor, motor resistor, and PI drive cam.

Contact Assembly Replacement

Instructions for replacing main moveable and stationary contact assemblies.

Holding Switch Assembly Replacement

Instructions for replacing the holding switch assembly.