SAMWONTECH
1st Edition of TEMP880S IM : Sep. 21. 2005 Page 62 / 101
2.12.4.2 PID GROUP(PID1~PID4) SETTING
▶ Generally, it uses value calculated by Auto Tuning, but users can set manually as well.
Diagram 2-53. PID Group
No. Instruction Contents Additional Explanation
○
1
PROPORTIONAL
BAND
Sets proportional band.
▶ Lessens the different between setting
▶ point(SP) and the pointing value
▶ (PV).
☞ Large proportional band: PV
☞ approaches to SP quickly, but
☞ vibration of MV will affect adversely
☞ upon safety of control Small
☞ proportional band: PV approaches
☞ to SP slowly, and remaining deviation
☞ may occur.
○
2
INTEGRAL
TIME
Sets integral time.
▶ Expanding integral time: Control
▶ Output(MV) is lessened. Therefore,
▶ approaching time to setting point(SP)
▶ is lengthened.
▶ Shortening integral time: Control
▶ Output(MV) is increased. Therefore,
▶ approaching time to setting point is
▶ shortened.
☞ Intergal operation can eliminate
☞ remaining derivitation at program
☞ operation.
☞ If integral time is too short, controlling
☞ may become impossible.
○
3
DERIVATIVE
TIME
Sets derivative time.
▶ It restraints PV-SP changing rate by
▶ caculating MV which rises along PV-
▶ SP changing rate.
☞ It restraints a radical change of PV or
☞ disturbance and accerates the ☞
☞ approach to setting point(SP).
○
4
OUTPUT LIMIT
HIGH
Sets control output operation
range limit high.
○
5
OUTPUT LIMIT
LOW
Sets control output operation
range limit low.
▶ OH > OL
○
1
○
2
○
3
○
4
○
5
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