PLATINUM
TM
Series Controllers User
’s
Guide
M5451
Omega Engineering | www.omega.com
58
Reference Section: Programming Mode (PRoG)
7.5
PID Configuration (PRoG > PId.S)
Select
PId.S
to configure the PID control settings. These settings apply to all outputs that have
had their Control Mode set to PID (
7.4.1.2 PID Control Mode (PRoG > oUt1-oUt6 > ModE >
). PID control can be optimized in a variety of ways. The suggested way is to initiate an
Autotune command (
7.5.3 Autotune (PRoG > PId > AUto)
) and then enable adaptive tuning
7.5.7 Adaptive Tuning (PRoG > PId > AdPt)
). The PID parameters may also be set manually or
manually adjusted after an Autotune command has been executed.
Navigate to the desired setting. Settings include the following:
ACtN
–
Action direction moves up or down to SP1
A.to
–
Autotuning Timeout sets a maximum amount of time for Autotuning
AUto
–
Initiates Autotuning
GAIN
–
Select the proportional, integral, and derivative factors for manual tuning
%Lo
–
Low clamping limit for Pulse and Analog outputs
%HI
–
High clamping limit for Pulse and Analog outputs
AdPt
–
Fuzzy logic adaptive tuning
Select the desired parameter.
7.5.1
Action Response (PRoG > PId > ACtN)
Select the Direction (
ACtN
) parameter.
Navigate to the desired setting. Settings include the following:
RVRS
–
“Reverse Action”: Increase to SP1, such as heating (factory default)
dRCt
–
“Direct Action”: Decrease to SP1, such as cooling
RVRS/dRCt
–
Increase or Decrease to SP1, such as heating/cooling
Select the indicated setting.
7.5.2
Autotune Timeout (PRoG > PId > A.to)
Select the Autotune Timeout (
A.to
) parameter.
Set the amount of time before the Autotune process gives up and times out in Minutes and
Seconds (MM.SS). Slowly responding systems should have a longer time-out setting.
Select the indicated setting.
7.5.3
Autotune (PRoG > PId > TUNE)
Select the Autotune (
AUto
) command. The unit displays
StRt
.
Confirm Autotune activation. The unit attempts to optimize the
P
,
I
, and
d
settings by
stimulating the system and measuring the response. If the
A.to
time out period expires before
the Autotune operation can complete, the unit displays a failure message
E007
. If the
Autotune operation completes successfully, the unit displays the message “
doNE
” and the
Run mode is switched to
IDLE
.
The Autotune function will select the tuning algorithm depending on the stability of current process and
the error difference between current process and the Control Setpoint (
SP1
). If the process is relatively
stable (i.e: at room temperature), a bump test will be performed to determine the plant characteristics.
