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PID parameter description and setting range:
Parameter Description
Range
Kp
Set the proportional control. The control output
u and the error e is proportional to multiples.
The greater the Kp value, the faster the system
response. However, too large Kp easily makes
output shocks. Use proportional control alone
can not eliminate steady state error. The error
can be eliminated by setting “Static Error
Reset” and “Damping Time.”
0.1~9999.9
(Default: 1)
Ti
The setting of integral control needs to
combine the use of the proportion of control.
The control output u and the error e is
proportional to the time integral. The use of
integral control can eliminate the steady state
error. The smaller the “Ti”, the stronger
integral action, but it will also reduce the
stability of the system. When u is out of range
(less than -5% or greater than 105%), the
integral control of the output section will be
frozen to avoid the termination of integral
(Windup) happens.
0~3600 sec
(Default:3600 sec
Note: If set “0”, it
represents turning off the
integral control)
Td
The setting of differential control needs to
combine the use of the proportional control.
The control output u and the error e is
proportional to the time integral. The use of
differential control can improve the transient
response of the system. However, it is not
conducive to the steady state error. The greater
the Td, the stronger the differential effect. But
it is easy to make the magnify the interference.
0.0~60.0 sec
(Default:0 sec, it represents
turning off the differential
control)
Setpoint
(SP)
Set the control set point.
-2.00~16.00 pH /
-1999~1999mV
(Default:7 pH / 0 mV)
Deadband
(DB)
Set control stop zone. When the pH/mV value
reaches SP
DB, it stops the control.
0.00~3.00 pH / 0~300mV
(Default:0.5 pH / 30 mV)
Prop Limit
Hi
Set the proportional upper limit.
-2~16 pH / -2000~2000mV
(Default:14 pH / 1000 mV)
Prop Limit
Lo
Set the proportional lower limit.
-2~16
pH/ -2000~2000mV
(Default:0 pH / -1000 mV)
Direction
Set the process control direction. “Direct”
means that to control the output (ex. dosing)
until the PV(ex. pH value) increases to SP(Set
point); “Reverse” means that to control the
output until the PV(ex. pH value) decrease to
the SP (Set point); “Both” means that it can
proceed the dual way control to control PV
Direct / Reverse / Both
(Default: Direct)
Note:
When the PID is set
as Direct or Reverse, one
way control. The device
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