The parameter Maximum leading 426 limits the difference between the output of
the ramp and the current actual value of the drive. The set maximum devia
dead time for the control system which should be kept as low as possible.
In case the drive is loaded heavily and high accelera
tion and deceleration values are
selected it is possible, that a set controller limit is reached while the drive is acceler-
ated or decelerated. In this case, the drive cannot follow the defined acceleration or
deceleration ramps. With Maximum leading 426,
you can limit the max. leading of
the ramp.
Parameter Settings
426 Maximum leading 0.01 Hz 999.99 Hz 5.00 Hz
Example: Fixed value at ramp output = 20 Hz, current actual value of drive =
15 Hz, selected Maximum leading 426 = 5 Hz
The frequency at the ramp output is increased to 15 Hz only, it is not increased fur-
ther. The difference (leading) between the frequency value a
t the ramp output and
the current actual frequency of the drive is limited to 5 Hz in this way.
The load occurring in a linear acceleration of the drive is reduced by the adjustable
modification speeds (S curve). The non-linear course of the frequency
is defined as a
ramp and states the time range in which the frequency is to be guided to the set
ramp. The values set with parameters 420 to 423 are maintained regardless of the
selected ramp times.
164 Operating Instructions ACU 06/13
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