15
Tuning
Procedures
Process Controller
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 seconds and the process will run in closed loop mode.
6) While monitoring the chart, increase Gain [ Gn.o1 ] by doubling the gain number until the process
variable becomes unstable. Then decrease Gain until the process oscillations are sustained, neither
increasing nor decreasing in amplitude 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 , where Rate cannot be used:
Gain [ Gn.01 ] = from Step (6) x 0.45
Reset [ rSEt ] = T/1.2
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 seconds 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.
In manual control mode, error conditions such as A/D errors and open or reversed sensors will be
ignored.
Note: The Series 16 controller can only be ordered with one of the following Special Functions installed per
instrument.
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