Pyromation Series 610 1_16 DIN - Manual (Page 125)

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- DIN Controllers & Indicators - Product Manual
7. Using manual control ensure that the valve is positioned away from its end stops.
8. Follow the instructions in the diagram below. At each stage, allow sufficient settling time
before moving on to the next stage.
Time
Process Vari
able
T
b
Time
Process Vari
able
T
a
START
Apply Power to
the load.
Does the
PV
continuously
Oscillate?
Note the time
interval T
a
Set
):)
= 0.8%
Set
+-/
= T
a
Are the
Oscillations
decaying to
zero?
Multiply
):)
setting by 1.5
END
Note the period
of the decaying
oscillations (T
b
)
Multiply
):)
setting by 1.5
Set
+-/
= T
b
2
No
Yes
Yes
No
The controller is now tuned.
Fine-tuning may be required
to optimise the controllers
Table 31. Manually Tuning Valve Control
Page 120
Manual Tuning 59305, Issue 6 – March 2006