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4. Using the figures obtained for the oscillation period (T) seconds
and amplitude (A) degrees (refer to Figure 5-3), the following
parameter values can be calculated:
a. Proportional Time= If 10 seconds or less use the
pulse output model.
b. Proportional Band % = A x 1.5 x 100 Set to next
full scale LARGER %
setting.
c. Derivative (Rate) Time = Set to next
SHORTER
setting.
d. Integral (Reset) Time = T Set to next LONGER
time setting.
NOTE
5.2.2 Alternative Tuning Method
Approach control will be activated in DEFAULT
setting=1.5 x prop. band. If the warm up
characteristic is unacceptable, refer to Section 5.7.
5. Enter these new values and restart the process from cold.
The above settings can be further adjusted to give optimum
performance. Sections 5.3 through 5.8 will provide guidance for
tuning the individual control terms.
If control is not satisfactory, the most likely cause is that the factory
(default) settings are unsuitable for your application. To find the
best settings for your process proceed as follows step by step.
T
20
T
20
Lower setpoint by 10%:
Select setting mode:
STEP ACTION DISPLAY
1
2
Press ★
Press P
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