22
Tuning
Procedures
Manual Tuning Procedure - Process
Controller (Zeigler-Nichols PID Method)
A chart recorder to monitor the process variable is required.
The controller must be properly scaled and filtering set as
instructed previously.
1) Apply power and place the controller in Standby by holding
the Mode key for four seconds.
2) Adjust the setpoint to the desired value.
3) Access menu level “05” and select one output: [ OUt 1 ]
for reverse-acting control or [ OUt 2 ] for direct-acting
control. Set the active output to PID [ Pid ] and the unused
output to Alarm [ ALr ] or On/Off [ On.F ].
4) Access menu level “02” and set [ Gn.01 ] to 1.0; [ Gr.o2 ] to
1.0; and [ rAtE ] and [ rSEt ] to “00”.
5) Press the Mode key for four seconds until display
flashes [ tUnE ]. Press the Mode key for another four sec-
onds and the process will run in closed loop mode.
6) While monitoring the chart, increase Gain [ Gn.o1 ] by dou-
bling the gain number until the process variable becomes
unstable. Then decrease Gain until the process oscillations
are sustained, neither increasing nor decreasing in ampli-
tude as a result of momentary setpoint change.
7) Multiply the Gain from Step (6) by 0.6.
8) Measure the period of one complete cycle of oscillation,
“T”, in seconds.
Calculate and enter these
numbers:
Rate [ rAtE ] = T/8
Reset [ rSEt ] = T/2
Gain [ Gn.01 ] = Gain from
Step (6)
On noisy processes,
where Rate cannot be used:
Gain [ Gn.01 ] = from Step
(6) x 0.45
Reset [ rSEt ] = T/1.2
Auto/Manual Operation (Standard)
To put the controller in manual mode, set the damping [dPnG]
parameter in menu level “02” to [ OFF ]. Press and hold the
Mode key for four seconds until the lower display window
flashes [ StbY ]. Hold down the Mode key for another four sec-
onds to initiate manual operation. The lower display window
will flash percentage of output power, from 100 to
-100, alternating with the output controlled (temperature
controllers will flash [ HEAt ] or [ CooL], process controllers
will flash [ OUt1 ] or [OUt2 ].) To take the controller out of
manual mode, press and hold Mode key to four seconds.
Note: The Series 16 controller can only be ordered with one
of
the following Special Functions installed per instrument.
Remote Setpoint Select
If your Series 16 controller was ordered with this option, you
may select either of two setpoints for your process. The sec-
ond setpoint can be enabled only by an external switch or sig-
nal, according to your ordering specifications. The "F2" LED on
the front panel will illuminate when a second setpoint is select-
ed. If you do not know how your Series 16 was configured,
refer to the ordering code and description on page 39.
Special Functions
In manual control
mode, error conditions
such as A/D errors
and open or reversed
sensors will be
ignored.
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