SAMWONTECH
2nd Edition of TEMP2000M_Series IM : April. 8. 2014 Page 135 / 176
18.2 PID group setting
18.2.1 PID group setting screen
▶
This is the screen for setting the details for respective PID groups.
▶
PID group is set for 1 ~ 6.
①
Proportion area (P): controls in the way to reduce deviation between set value (SP) and indication value
(PV).
☞
When proportion integer is large, indication value (PV) approaches quickly to set value (SP). However
it may have a negative influence on the stability of control due to the control output (MV) fluctuation.
☞
When proportion integer is small, indication value (PV) approaches slowly and stably to set value (SP),
but it may cause residual deviation.
②
Integral time (I): When integral time is set long, control output (MV) decreases, therefore time to
approach set value (SP) is longer. When integral time is set short, control output (MV) increases,
therefore time to approach set value (SP) is shorter.
☞
Integral operation can eliminate residual deviation which may result from P operation.
☞
If integral time is too short, it may result in out of control.
③
Differential time (D): calculates control output (MV) corresponding to deviation (PV-SP) change ratio,
so keeps deviation (PV-SP) from changing.
☞
Speed to approach set value (SP) is faster, so it prevents rapid change in indication value (PV) or
disturbance.
④
Output upper limit·lower limit: sets upper and lower limit of operation scope in control output.
☞
When changing output upper limit and lower limit, it applies to control output during auto tuning.
☞
When control output type is SSR, it operates with 0%, 100% output value irrespective of limit value
which is set for output upper and lower limit during auto tuning.
⑤
Correction value: If integral time (I) is “0” during PID control, parameter which is used to apply manual
set value for integral time in PID calculation.
⑥
Hysteresis value is set during ON/OFF control.
▶
OUTPUT LIMIT parameter is displayed only when PID control activated(P≠0)
▶
ON/OFF HYSTERESIS parameter is displayed only when ON/OFF control activated(P=0)
①
②
③
④
[Fig. 18-3] PID group setting screen
⑤
⑥
Summary of Contents for Temp 2000 M
Page 1: ...Instruction Manual...
