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22 … 68
Printed in Germany • Edition 02.14 • Nr. 254 722
8.2 P2x - Fan
The MPA51 controls the fan by
means of PWM signal and evaluates
a hall sensor signal delivered by the
fan in form of a rotation speed.
The number of feedback pulses per
8 Parameters
8.2 P2x Fan
Parameter
P2x
Designation Description Setting
P20 Fan: Control Indicates if the fan is controlled
or regulated. For the regulation, a
feedback signal to record the fan
speed is required!
Setting 0: Control
Setting 1: Regulation
P21 Fan: Delay / ramp a) For fan control:
This parameter is used to smoothen
jumps of the fan activation signal
(PWM signal).
b) For fan regulation:
The desired fan behaviour can be
reached by means of the KP and
TN factors. However, jumps in the
setpoint values for the fan can be
slowed down via the ramp delay
function.
Setting 0 means that even big jumps
are immediately transformed. The
bigger the set value the slower the
PWM signal is adapted to its new
nominal value in case of changes.
The value of the parameter should
be set to 0.
rotations has to be indicated in P24.
In case of wrong values in P24, the
MPA calculates a wrong rotation
speed!
The MPA can control or regulate the
fan (PI controller).