Gossen MetraWatt R2600 - Page 33

GOSSEN-METRAWATT GMBH 33
Evaluation of the trial run
– Apply a tangent to the curve at intersection P of actual value and set point and/or switch-off point of the output.
– Measure out time
∆t.
– Measure out oscillation width x
ss
, for step controller overshoot ∆x.
If a limitation was set for the set point, it is required to correct the proportional band
YH positive: Multiply Pb I by 100 % / YH
YH negative: Multiply Pb II by –100 % / YH
Parameter values
tu 1.5 • ∆t ∆t – (tY / 4)
tc tu / 12 tY / 100
Pb I (x
ss
/ MBU) • 100 % (x
ss
/ MBU) • 200 % (∆x / MBU) • 50 %
Pb II – Pb I • (T
I
/ T
II
) – Pb I • (T
I
/ T
II
) –
Parameter Two-state controller 3-state controller Contin. controller Split range controller Step controller
P
∆t
∆x
x
ss
T
I
T
II
dbnd = 0dbnd = MBU
(only for three-state/split range controller)