4-17
PPC Manual Revision 1
Chapter 4: Operation Monitoring and Control
Description
Description and Tuning of Proportional Band
Output = e
100
P
P: Proportional band
reverse action)
0%
P = 100%
SP
Wide proportional band
SP SP
Deviation
Deviation Deviation
P = 50%
P = 0%
(ON/OFF)
Proportional band
Total span
Output (%)
Output (%)
Output (%)
Time
SP
• If P is too small, oscillation will appear in the measured temperature.
P is too small.
P is too big.
P is moderate.
Offset
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