AMI 420 Manual

1 Cover Page
American Magnetics, Inc.
PO Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509, Tel: [phone], Fax: [phone]
Rev. 7, July 2002
MODEL 420 POWER SUPPLY
PROGRAMMER
INSTALLATION, OPERATION, AND
MAINTENANCE INSTRUCTIONS
EXCELLENCE IN MAGNETICS AND CRYOGENICS

Model 420 Power Supply Programmer
1 Declaration of Conformity
Z
Declaration of Conformity
Application of Council Directive: 72/73/EEC
Standard to which Conformity is Declared: EN 61010-1: 1993 w/A1, A2
Manufacturer’s Name: American Magnetics, Inc.
Manufacturer’s Address: 112 Flint Road, P.O. Box 2509
Oak Ridge, TN 37831-2509
U.S.A.
Type of Equipment: Power Supply Programmer
Model Number: Model 420
I, the undersigned, hereby declare that the equipment specified above
conforms to the above Directive and Standard.
Place: Oak Ridge, Tennessee, U.S.A. Signature:
Date: October 15, 1999
Full Name: Charles H. Hargis
Function: Quality Assurance Manager

Model 420 Power Supply Programmer
Model 420 Power Supply Programmer Configuration
AMI Order Number:_____________________ Shipping Date:_________________________
Model 420 Serial #:______________________ Firmware Revision:_____________________
Input Power Requirements:___________________________________________________________
Configuration Notes:
_____________________________________________________________________________________
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AMI Warranty
All products manufactured by AMI are warranted to be free of defects in materials and
workmanship and to perform as specified for a period of one year from date of shipment. In
the event of failure occurring during normal use, AMI, at its option, will repair or replace all
products or components that fail under warranty, and such repair or replacement shall
constitute a fulfillment of all AMI liabilities with respect to its products. Since, however,
AMI does not have control over the installation conditions or the use to which its products
are put, no warranty can be made of fitness for a particular purpose, and AMI cannot be
liable for special or consequential damages. All warranty repairs are F.O.B. Oak Ridge,
Tennessee, USA.
Copyright © 2002 by American Magnetics, Inc., Oak Ridge, Tennessee, USA
Rev. 7
1 Configuration

Rev. 7 v
Table of Contents
Foreword.................................................................................. xi
Purpose and Scope....................................................................xi
Contents of This Manual .........................................................xi
Applicable Hardware ..............................................................xii
General Precautions................................................................xii
Safety Summary..................................................................... xiv
1 Introduction.............................................................................. 1
1.1 Model 420 Features................................................................... 1
1.1.1 Digitally-Controlled....................................................... 1
1.1.2 Superior Resolution and Stability ................................ 1
1.1.3 Intuitive Human-Interface Design............................... 1
1.1.4 Flexible Design .............................................................. 2
1.1.5 Standard Remote Interfaces......................................... 2
1.1.6 Programmable Safety Features.................................... 2
1.2 Front Panel Layout................................................................... 3
1.3 Rear Panel Layout..................................................................... 5
1.4 Model 420 Specifications @ 25 °C .......................................... 7
1.5 Operating Characteristics......................................................... 9
1.5.1 Single-Quadrant Operation .......................................... 9
1.5.2 Dual-Quadrant Operation........................................... 10
1.5.3 Simulated Four-Quadrant Operation......................... 10
1.5.4 True Four-Quadrant Operation.................................. 11
2 Installation.............................................................................. 13
2.1 Inspecting and Unpacking...................................................... 13
2.2 Model 420 Mounting ............................................................... 13
2.3 Power Requirements............................................................... 14
2.4 Collecting Necessary Information.......................................... 15
2.5 System Interconnects.............................................................. 15
2.5.1 Unipolar Supply without Energy Absorber ............... 16
2.5.2 Unipolar Supply with AMI Model 601 Energy
Absorber....................................................................... 18
2.5.3 Unipolar Supply with AMI Model 600/620 Energy
Absorber....................................................................... 21
2.5.4 Unipolar Supply with AMI Model 610/630 Energy
Absorber and Current Reversing Switch ................... 24
2.5.5 High-Current Four-Quadrant Supply........................ 26
2.5.6 Low-Current, High-Resolution Four-Quadrant
Supply .......................................................................... 28
2.5.7 Third-Party Power Supplies ....................................... 31
1 Table of
Contents

vi Rev. 7
Table of Contents
2.6 Special Configurations.............................................................31
2.6.1 Superconducting Magnets without a Persistent
Switch ...........................................................................31
2.6.2 Short-Circuit or Resistive Load...................................32
2.7 Power-Up and Test Procedure.................................................33
3 Operation.................................................................................37
3.1 Default Display Modes.............................................................37
3.1.1 Entering Numerical Values.........................................38
3.1.2 Menu Option Selection.................................................39
3.1.3 Exiting Menus ..............................................................39
3.2 Setup Menu Descriptions ........................................................39
3.2.1 Supply Setup Submenu................................................40
3.2.2 Load Setup Submenu...................................................44
3.2.3 Misc Setup Submenu ...................................................48
3.2.4 Comm Setup Submenu ................................................49
3.2.5 Example Setup .............................................................50
3.3 Ramping Functions..................................................................52
3.3.1 Ramping States and Controls......................................52
3.3.2 Ramping in Manual Mode ...........................................54
3.3.3 Ramping in Programmed Mode...................................55
3.3.4 Ramp to Zero Mode ......................................................56
3.3.5 Dial Adjustment of Current/Field in PAUSED Mode 56
3.3.6 Ramping Functions Example ......................................57
3.4 Persistent Switch Heater Control...........................................59
3.4.1 Procedure for Entering Persistent Mode ....................60
3.4.2 Procedure for Exiting Persistent Mode.......................60
3.4.3 Optional Switching of External Power Supply...........61
3.5 Quench Detection.....................................................................61
3.5.1 Disabling Automatic Quench Detection......................62
3.6 Summary of Operational Limits and Default Settings..........63
4 Remote Interface Reference ..................................................65
4.1 SCPI Command Summary ......................................................65
4.2 Programming Overview...........................................................69
4.2.1 SCPI Language Introduction.......................................69
4.2.2 SCPI Status System.....................................................70
4.2.3 Standard Event Register .............................................73
4.2.4 Command Handshaking ..............................................74
4.3 RS-232/422 Configuration .......................................................76
4.3.1 Serial Port Connector...................................................76

Rev. 7 vii
Table of Contents
4.3.2 Termination Characters.............................................. 76
4.3.3 Flow Control Modes..................................................... 77
4.4 IEEE-488 Configuration......................................................... 77
4.4.1 Termination Characters.............................................. 77
4.4.2 Device Clear................................................................. 78
4.4.3 Trigger Command........................................................ 78
4.5 Command Reference ............................................................... 79
4.5.1 System-Related Commands........................................ 79
4.5.2 Status System Commands .......................................... 80
4.5.3 SETUP Configuration Commands and Queries ........82
4.5.4 Ramp Configuration Commands and Queries........... 85
4.5.5 Ramping State Commands and Queries.................... 87
4.5.6 Switch Heater Commands and Queries..................... 88
4.5.7 Quench State Control and Queries............................. 89
4.5.8 Trigger Functions........................................................ 90
4.6 Error Messages........................................................................ 92
4.6.1 Command Errors ......................................................... 92
4.6.2 Query Errors................................................................ 93
4.6.3 Execution Errors.......................................................... 94
4.6.4 Device Errors............................................................... 94
5 Service .................................................................................... 95
5.1 Model 420 Maintenance..........................................................95
5.2 Model 420 Troubleshooting Hints .......................................... 95
5.3 Additional Technical Support............................................... 103
5.4 Return Authorization............................................................ 104
Appendix............................................................................... 105
A.1 Magnet Station Connectors ............................................. 105
A.2 Auxiliary LHe Level/Temperature Connectors ............... 106
A.3 Current Shunt Terminals..................................................... 107
A.4 Program Out BNC Connector............................................... 108
A.5 Quench I/O Connector........................................................... 109
A.6 IEEE-488 Connector ........................................................111
A.7 RS-232/422 Connector........................................................... 112
Index...................................................................................... 115

viii Rev. 7
List of Figures
Figure 1-1 The four regions, or quadrants, of system operation. ..............9
Figure 1-2 Single-Quadrant Magnet System..............................................9
Figure 1-3 Dual-Quadrant Magnet System..............................................10
Figure 1-4 Simulated Four-Quadrant Magnet System............................10
Figure 1-5 True Four-Quadrant System...................................................11
Figure 2-1 System interconnect diagram for a unipolar supply
without an energy absorber.....................................................17
Figure 2-2 System interconnect diagram for a unipolar supply
with an AMI Model 601 Energy Absorber..............................19
Figure 2-3 System interconnect diagram for a unipolar supply
with an AMI Model 600/620 Energy Absorber.......................22
Figure 2-4 System interconnect diagram for a unipolar supply
with an AMI Model 610/630 energy absorber and a
current reversing switch..........................................................25
Figure 2-5 System interconnect diagram for the AMI Model 4Q-05100
power supply............................................................................27
Figure 2-6 System interconnect diagram for the Kepco BOP series
power supply.............................................................................29
Figure 2-7 Illustration of stabilizing resistor in parallel with the
magnet......................................................................................31
Figure 3-1 Default display modes..............................................................37
Figure 3-2 Setup menu, submenus, and parameter diagram..................40
Figure 3-3 Example power supply operating ranges................................42
Figure 3-4 Example limits setup...............................................................45
Figure 3-5 Example magnet specification sheet.......................................50
Figure 3-6 Example of ramping to two different programmed current
settings. ....................................................................................57
Figure 4-1 The Model 420 status system..................................................70
Figure 4-2 Illustration of asterisk annunciator indicating the
Model 420 is in remote mode...................................................80
Figure A-1 Example external circuitry for quench input/output...........110
1Listof
Figures