Mitsubishi Electric MELSEC FX Series User Manual page 10

FX -4LC User's Manual
3U
6. Introduction of Functions
6.1 Functions List ................................................................................................................................ 33
6.2 Control Mode Switch Function ...................................................................................................... 34
6.3 Transistor Output Selection Function............................................................................................ 36
6.4 PID control .................................................................................................................................... 38
6.4.1 Easy PID control with two degrees of freedom.............................................................................. 38
6.4.2 Overshoot prevention function....................................................................................................... 39
6.5 Two-position Control ..................................................................................................................... 40
6.6 Heating/cooling PID control........................................................................................................... 41
6.6.1 Heating/cooling PID control ........................................................................................................... 41
6.6.2 Overshoot prevention function....................................................................................................... 42
6.6.3 Overlap/dead band function .......................................................................................................... 43
6.6.4 Cooling method ............................................................................................................................. 44
6.7 Cascade control ............................................................................................................................ 45
6.7.1 Cascade control............................................................................................................................. 45
6.7.2 Tuning during cascade control ...................................................................................................... 47
6.7.3 SV tracking selection function ....................................................................................................... 48
6.8 Auto Tuning Function .................................................................................................................... 49
6.8.1 AT (Auto tuning) ............................................................................................................................ 49
6.8.2 Conditions for performing and aborting AT (auto tuning) .............................................................. 51
6.8.3 AT (auto tuning) bias ..................................................................................................................... 53
6.9 Startup Tuning Function................................................................................................................ 54
6.9.1 ST (startup tuning)......................................................................................................................... 54
6.9.2 Conditions for performing and aborting ST (startup tuning) .......................................................... 56
6.10 AUTO/MANUAL mode changeover ............................................................................................ 58
6.10.1 AUTO mode and MANUAL mode................................................................................................ 58
6.10.2 Balance-less, bump-less function................................................................................................ 59
6.11 Heater Disconnection Alarm Function (HBA).............................................................................. 60
6.11.1 Heater disconnection alarm function ........................................................................................... 60
6.11.2 Number of times of heater disconnection alarm delay ................................................................ 61
6.12 Loop Breaking Alarm Function (LBA).......................................................................................... 62
6.12.1 Loop breaking alarm function ...................................................................................................... 62
6.12.2 Loop breaking alarm dead zone (LBD)........................................................................................ 64
7. Alarm
7.1 Alarm List ...................................................................................................................................... 65
7.2 Alarm Functions ............................................................................................................................ 67
7.2.1 Upper limit input value alarm ......................................................................................................... 67
7.2.2 Lower limit input value alarm ......................................................................................................... 67
7.2.3 Upper limit deviation alarm ............................................................................................................ 68
7.2.4 Lower limit deviation alarm ............................................................................................................ 68
7.2.5 Upper/lower limit deviation ............................................................................................................ 68
7.2.6 Range alarm .................................................................................................................................. 69
7.2.7 Alarm wait operation...................................................................................................................... 69
7.2.8 Alarm re-wait operation ................................................................................................................. 70
7.3 Alarm Dead Zone Setting.............................................................................................................. 71
7.4 Number of Times of Alarm Delay .................................................................................................. 72
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