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3-6 Control specialities
1. Usage of Four Parameters:
Proportion parameter (Kp), integral parameter (Ki), differential
parameter (Kd), control proportion band (Diff)
Parameter P is the proportion parameter:
Parameter I is the integral parameter, mainly used to remove net difference.
Parameter D is the differential parameter, mainly used to control signal's change trend.
Temperature Control Band Means: in the assigned band, to carry out PID control，beyond
the band does not carry out PID control.
2. Temperature Control Cycle:
When carrying out PID adjustment, the output will carry on
heating according to the duty cycle got by PID output value, this period is called
Temperature Control Cycle.
3. Control Specialties:
The band
of the PID adjustment is: (QD-Diff QD + Diff), when the temperature is lower
than QD-Diff, controller goes on heating, when temperature is higher than QD + Diff, the
controller will stop heating.
The Control Curve of PID is Shown Below:
Each parameter's reference value: Kp=20/100, Ki=5/20, Kd=200/500. DIFF=100~200
This reference value only for normal condition，according to the locale detail condition, each
reference value could be beyond the band.
XP3-BD User Manual
Page 19 of 30
MANUL008R2V1
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