Despatch 926E Equipment Manual (C-155)Rev 2/11 - Manual (Page 6)

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TABLE OF CONTENTS
PREFACE ........................................................................................................................ii
INTRODUCTION ............................................................................................................. 3
230 Volt, 50/60 HZ Operation ............................................................................... 3
Specifications ....................................................................................................... 4
INSTRUCTIONS ............................................................................................................. 5
Operator Training Requirements .......................................................................... 5
Installation ............................................................................................................ 6
Installation of Cooling Gas.................................................................................... 8
Installation of Carbon Dioxide ............................................................................... 9
Liquid CO
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Cylinder Installation ............................................................... 13
Installation of Liquid Nitrogen ............................................................................. 14
Liquid Nitrogen Cylinder ........................................................................... 16
Operating ............................................................................................................ 18
Controller Power Up ................................................................................ 18
Heating Only Operation ........................................................................... 19
Cooling Operation .................................................................................... 20
Safety Information ................................................................................... 21
Performance Characteristics ................................................................... 21
THEORY OF OPERATION ........................................................................................... 26
Functional Description ........................................................................................ 26
High Limit Controller ................................................................................ 28
Watlow EZ-Zone PM Controller .......................................................................... 29
Digital Communication ............................................................................. 30
Serial Data Transmission ........................... Error! Bookmark not defined.
MAINTENANCE ............................................................................................................ 32
Preventative Maintenance Schedule .................................................................. 34
Test Equipment Required ........................................................................ 35
Chamber .................................................................................................. 35
Coolant Solenoid Orifice Assembly ......................................................... 36
CO
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Filter ................................................................................................. 37
Corrective Maintenance ...................................................................................... 38
Service Procedures ................................................................................. 40
Electronic Control Chassis ....................................................................... 41
HI-LIMIT Thermoswitch ........................................................................... 42
APPENDIX .................................................................................................................... 43
IEEE 488 Interface Converter Set-up ................................................................. 43
IEEE 488 Interface Converter .................................................................. 45
Serial Signal Descriptions ........................................................................ 46
XON/XOFF Protocol ................................................................................ 48
XON/XOFF Versus RTS/CTS Handshaking ............................................ 48
Sample Program ...................................................................................... 49
Sample Output ......................................................................................... 50
Troubleshooting .................................................................................................. 51
Schematic Diagrams .......................................................................................... 52