Chapter 3 - Alpha/ Delta Drives

CONTENTS

Section 3.1 - Introduction

3.1.1 Reference Information
3.1.2 Absolute Encoder
3.1.3 Incremental & absolute encoder interfaces
3.1.4 Power Amplifiers
3.1.5 Servodrive
3.1.6 Brake Amplifier
3.1.7 Velocity PI Controller
3.1.8 Interlock Chain
3.1.9 Interlock Chain for AL
3.1.10 Interlock Chain for AZ
3.1.11 Operating Procedure
3.1.12 Start-up
3.1.13 Stop
3.1.14 Connections to Other Subsystems

Section 3.2 - Signal Descriptions

3.2.1 Introduction
3.2.2 Power Amplifier Signals
3.2.3 Motor Signals
3.2.4 PI Controller Signals
3.2.5 Absolute Encoder Signals
3.2.6 Limit Switch Signals
3.2.7 Computer Interlock Signals
3.2.8 Miscellaneous Signals

Section 3.3 - Connection Schedule

3.3.1 Introduction
3.3.2 Altitude absolute encoder signals to Digital I/O ACRO-0
3.3.3 Altitude limit switch signals to Didital I/O ACRO-0
3.3.4 Altitude signals, via Digital I/O ACRO-1
3.3.5 Motor signals
3.3.6 Azimuth signals, via Digital I/O ACRO-1
3.3.7 Analog I/O signals

Section 3.4 - Cabling

3.4.1 Numbering System
3.4.2 Explanation of Terms
3.4.3 Cable Types
3.4.4 Azimuth Motor Connections
3.4.5 Azimuth Tacho Connections
3.4.6 Altitude Motor Connections
3.4.7 Altitude Tacho Connections
3.4.8 Brake Connections - Altitude and Azimuth
3.4.9 Thermal Switches and Brake Contact
3.4.10 Other Interlock Connections
3.4.11 Control Rack Connections

Section 3.5 - Altitude and Azimuth Control Cabinets

3.5.1 Explanation of Terms
3.5.2 Control Rack

Section 3.6 - Al/ Az Maintenance Information

3.6.1 Introduction
3.6.2 Drawing List

3.6.3 Data Sheets

Section 3.7- Al/ Az Special Tasks Maintenance Information

3.7.1 Altitude Motor Replacement