25 … 68
24 … 68
Printed in German
y • Edition 02.14 • Nr
. 254 722
8 Parameters
8.2 P2x Fan
Parameter
P2x
Designation
Description
Setting
P22
Fan: KP factor
a) For fan control:
This factor is only relevant if the fan
is controlled!
b) For fan regulation:
The Kp factor defines the effect of
the difference between nominal
value and actual value on the regu-
lating value.
Kp is no proportional factor:
• small Kp values result in a slow
adaptation to the nominal value.
• big Kp values result in a fast regu-
lation, but can also create an over-
shooting
Always observe the interaction be-
tween the P and I part, that means
that a separate consideration of Kp
and Tn is not possible!
P23
Fan: TN factor
a) For fan control:
This factor is only relevant if the fan
is controlled!
b) For fan regulation:
The Tn factor defines the effect of
the history, that means the accu-
mulated difference between the
nominal and the actual value (inte-
gration), to the regulating value.
Tn is a division factor:
• small Tn values result in a fast but
more instable regulation. Reso-
nance and swinging-up systems
are the possible effects of wrong
values.
• big Tn factors stabilise the sys-
tem.
Always observe the interaction be-
tween the P and I part, that means
that a separateconsideration of Kp
and Tn is not possible!
P24
Fan: Pulses per rota-
tion
a) For fan control:
This value is only relevant if the
fan speed is to be recorded! The
recording has no influence on the
behaviour of the MPA.
b) For fan regulation:
The number of impulses per rota-
tion provided by the fan must be set
here.
If an incorrect value is indicated,
the determined speed is incorrectly
calculated.
