A0025218
38 Optimization of settings T
n
and K
p
A Actual value
B Time
1 T
n
too small
2 T
n
too large
3 K
p
too large
4 K
p
too small
5 Optimum setting
Actuating signal outputs via contacts (R247 to R2410 and R257 to R2510)
Each control contact outputs a cyclical signal whose intensity corresponds to the
controller's actuating value. A distinction is made according to the type of signal cycle:
• Pulse length modulation
The bigger the calculated manipulated variable is, the longer the contact affected
remains picked up. The period T can be adjusted between 0.5 and 99 s (field R248 or
R258). Outputs with pulse length modulation are used to activate solenoid valves.
• Pulse frequency modulation
The bigger the calculated manipulated variable is, the higher the switching frequency of
the contact affected. The maximum switching frequency 1/T can be set between 60 and
180 min
-1
(field R249 or R259). The on-time t
on
is constant. It depends on the set
maximum frequency and is approx. 0.5 s for 60 min
-1
and approx. 170 ms for 180 min
-1
.
170 ms. Outputs with pulse frequency modulation are used to activate directly controlled
solenoid dosing pumps.
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