4-19
PPC Manual Revision 1
Chapter 4: Operation Monitoring and Control
Description and Tuning of Derivative Time
Output = e + T
D
e
100
P
d
dt
P = 100%
Output change due to P action
Output change due to D action
Time
Derivative
Small
derivative time
Large
derivative time
e : Deviation
T
D
: Derivative time
Deviation
Output (%)
Time
SP
• If D is too large, short-period oscillation will appear in
the measured temperature.
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