Pd Control (Stable Control In Which A Setpoint Is Not Exceeded) - YOKOGAWA UT Advanced UT32A User Manual

8.2 Setting Control Type (CNT)
8.2.5 PD Control (Stable Control in Which a Setpoint is not Exceeded)
Description
Setting Details
8-22
This control type performs control in which integral action (I action) is excluded from PID
action.
Set the integral time (I or Ic) to OFF.
It is useful when stable control in which a setpoint is not exceeded is desired for integral
processes in which constant flows are delivered.
The following shows the PID control computation formula.

100
 
OUT = e + Td
P

where OUT: control output, e: deviation (PV-SP), P: proportional band, Td: derivative time,
∆PV: PVn-PVn-1 (n-1: value before one control period), and MR: manual reset
The following table shows combination of PD control and output method.
PD control
√: Available, N/A: Not available
Parameter
Name
symbol
P Proportional band
D Derivative time
MR Manual reset
Number of PID
PIDG.
groups
Note1: The PID number (1 to 4, or R) is displayed on Group display while the parameter P, D, or MR
is displayed.
Note
When changing the setpoint of the parameter PIDG., if the setpoint of the parameter PIDN
which belongs to the SP menu is larger than that of the parameter PIDG., the PIDN setpoint is
changed to the PIDG. setpoint.

d
 
• ∆PV + MR
dt

Current
proportional
output
√
Display
level
0.0 to 999.9%
EASY
When 0.0% is set, it operates as 0.1%.
OFF: Disable
EASY
1 to 6000 s
EASY -5.0 to 105.0%
STD 1 to 4
Output method
Time
ON/OFF
output
output
√ N/A
Setting range
Position
proportional
output
√
Menu symbol
PID
CTL
IM 05P01D31-01EN