Lakeshore 325 - Page 8

Lake Shore Model 325 Temperature Controller User’s Manual
ii Table of Contents
TABLE OF CONTENTS (Continued)
Chapter/Section Title Page
3 INSTALLATION ...................................................................................................................................................... 3-1
3.0 GENERAL ......................................................................................................................................... 3-1
3.1 INSPECTION AND UNPACKING ...................................................................................................... 3-1
3.2 REAR PANEL DEFINITION ............................................................................................................... 3-2
3.3 LINE INPUT ASSEMBLY ................................................................................................................... 3-3
3.3.1 Line Voltage ................................................................................................................................... 3-3
3.3.2 Line Fuse and Fuse Holder ............................................................................................................ 3-3
3.3.3 Power Cord .................................................................................................................................... 3-3
3.3.4 Power Switch ................................................................................................................................. 3-3
3.4 DIODE/RESISTOR SENSOR INPUTS .............................................................................................. 3-4
3.4.1 Sensor Input Connector and Pinout ............................................................................................... 3-4
3.4.2 Sensor Lead Cable ........................................................................................................................ 3-4
3.4.3 Grounding and Shielding Sensor Leads ......................................................................................... 3-5
3.4.4 Sensor Polarity ............................................................................................................................... 3-5
3.4.5 Four-Lead Sensor Measurement ................................................................................................... 3-5
3.4.6 Two-Lead Sensor Measurement .................................................................................................... 3-5
3.4.7 Lowering Measurement Noise........................................................................................................ 3-6
3.5 THERMOCOUPLE SENSOR INPUTS .............................................................................................. 3-6
3.5.1 Sensor Input Terminals .................................................................................................................. 3-6
3.5.2 Thermocouple Installation .............................................................................................................. 3-7
3.5.3 Grounding and Shielding ................................................................................................................ 3-7
3.6 HEATER OUTPUT SETUP ............................................................................................................... 3-7
3.6.1 Loop 1 Output ................................................................................................................................ 3-7
3.6.2 Loop 1 Heater Output Connector ................................................................................................... 3-7
3.6.3 Loop 1 Heater Output Wiring ......................................................................................................... 3-7
3.6.4 Loop 1 Heater Output Noise .......................................................................................................... 3-8
3.6.5 Loop 2 Output ................................................................................................................................ 3-8
3.6.6 Loop 2 Output Resistance .............................................................................................................. 3-8
3.6.7 Loop 2 Output Connector ............................................................................................................... 3-8
3.6.8 Loop 2 Heater Protection ............................................................................................................... 3-8
3.6.9 Boosting the Output Power ............................................................................................................ 3-8
3.7 INITIAL SETUP AND SYSTEM CHECKOUT PROCEDURE ............................................................ 3-9
4 OPERATION ........................................................................................................................................................... 4-1
4.0 GENERAL ......................................................................................................................................... 4-1
4.1 FRONT PANEL DESCRIPTION ........................................................................................................ 4-1
4.1.1 Keypad Definitions ......................................................................................................................... 4-1
4.1.2 Annunciators .................................................................................................................................. 4-2
4.1.3 General Keypad Operation ............................................................................................................ 4-2
4.1.4 Display Definition ........................................................................................................................... 4-3
4.2 TURNING POWER ON ..................................................................................................................... 4-4
4.3 DISPLAY FORMAT AND SOURCE (UNITS) SELECTION ............................................................... 4-4
4.4 INPUT SETUP ................................................................................................................................... 4-6
4.4.1 Diode Sensor Input Setup – 10 µA Excitation Current ................................................................... 4-6
4.4.2 Diode Sensor Input Setup – 1 mA Excitation Current .................................................................... 4-6
4.4.3 Resistor Sensor Input Setup .......................................................................................................... 4-7
4.4.3.1 Thermal EMF Compensation ...................................................................................................... 4-8
4.4.4 Thermocouple Sensor Input Setup ................................................................................................. 4-8
4.4.4.1 Room-Temperature Compensation ............................................................................................ 4-9
4.4.4.2 Room-Temperature Calibration Procedure ................................................................................. 4-9
4.4.5 Temperature Limit (For Firmware Version 1.5 and Later) ........................................................... 4-10
4.5 CURVE SELECTION ....................................................................................................................... 4-10
4.5.1 Diode Sensor Curve Selection ..................................................................................................... 4-11
4.5.2 Resistor Sensor Curve Selection ................................................................................................. 4-12
4.5.3 Thermocouple Sensor Curve Selection ........................................................................................ 4-12
4.5.4 Filter ............................................................................................................................................. 4-12