Despatch MIC 1422

iii
TABLE OF CONTENTS
TABLE OF CONTENTS..................................................................................................iii
SECTION 1: PRODUCT DESCRIPTION....................................................................... 1
1.1 General .................................................................................................................. 1
1.2 Displays................................................................................................................. 2
1.3 Control................................................................................................................... 2
1.4 Alarms................................................................................................................... 2
1.5 Process Variable/Setpoint Value Re-Transmission Output.................................... 3
SECTION 2: INSTALLATION AND WIRING.................................................................. 5
2.1 Mounting ............................................................................................................... 5
2.2 Wiring Guidelines.................................................................................................. 7
Installation Considerations........................................................................................ 7
AC Power Wiring....................................................................................................... 8
Wire Isolation ............................................................................................................ 8
Use Of Shielded Cable.............................................................................................. 8
Noise Suppression At The Source............................................................................ 9
2.3 Sensor Placement (Thermocouple or RTD)........................................................ 10
2.4 Input Connections ............................................................................................... 12
2.5 Output Connections ............................................................................................ 17
SECTION 3: OPERATION........................................................................................... 21
3.1 Control Capability................................................................................................ 21
3.2 Control Responses............................................................................................... 21
3.3 Direct/Reverse Operation of Outputs .................................................................. 22
3.4 On-Off Control..................................................................................................... 22
3.5 Time Proportioning Control ................................................................................. 22
3.6 Current Proportioning Control ............................................................................. 23
3.7 Power Up Procedure........................................................................................... 25
3.8 Keypad Operation ............................................................................................... 25
3.9 Front Panel Indicators......................................................................................... 26
SECTION 4: CONTROL MODE................................................................................... 27
4.1 Operation ............................................................................................................ 27
4.2 Active Setpoint .................................................................................................... 27
4.3 Override Feature ................................................................................................. 28
4.4 Alarm Status Display........................................................................................... 28
4.5 Over-Range I Under-Range Display.................................................................... 28
4.6 Manual Control (Percent Output) ........................................................................ 29
4.7 Setup Modes....................................................................................................... 30
SECTION 5: TUNE MODE........................................................................................... 31
5.1 Tune Mode Description....................................................................................... 31
5.2 Manual Tuning Method ....................................................................................... 32
SECTION 6: ALARM MODE........................................................................................ 35
6.1 Alarm Mode Description...................................................................................... 35
6.2 Loop Alarm Enable.............................................................................................. 40
6.3 Loop Alarm Time................................................................................................. 40
6.4 Logical Combination of Alarms ........................................................................... 41