C6-5
IM 34M06H62-02E 2nd Edition : June 2008-00
Adjusting the Integral Time
When adjusting the integral time manually, note the following points:
- The adjustment is primarily for reducing the offset.
- Always adjust downwards from a longer time to a shorter time.
- When reducing the proportional band, appearance of long periodic oscillations
indicates that the proportional band is too short. Setting too short an integral time
produces similar oscillations in the measured value. However, oscillations caused by
the integral action are characterized by longer periods than those caused by the
proportional band.
Figure C6.6 Adjusting the Integral Time
Adjusting the Manual Reset Value
When adjusting the manual reset value (MR), note the following points:
- Adjust MR so as to reduce the offset.
- Adjust MR so that it does not produce an offset in the opposite direction.
A manual reset value that is too large will produce an offset in the opposite direction.
Table C6.3 Integral Time and Manual Reset Parameters
Data Position Number
Symbol
Description Unit Data Range
Default
Value
Attribute
Stored
Loop1 Loop2 Loop3 Loop4
207 407 607 807 1.TI Integral time Second 0:OFF, 1to 6000 (1-6000 s) 240 RW
227 427 627 827 2.TI Integral time Second 0:OFF, 1to 6000 (1-6000 s) 240 RW
247 447 647 847 3.TI Integral time Second 0:OFF, 1to 6000 (1-6000 s) 240 RW
267 467 667 867 4.TI Integral- time Second 0:OFF, 1to 6000 (1-6000 s) 240 RW
211 411 611 811 1.MR Manual reset value % -5.0 to 105.0% 500 RW
231 431 631 831 2.MR Manual reset value % -5.0 to 105.0% 500 RW
251 451 651 851 3.MR Manual reset value % -5.0 to 105.0% 500 RW
271 471 671 871 4.MR Manual reset value % -5.0 to 105.0% 500 RW
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