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Operating Instructions ACU
227
Operation Mode 720
Function
0 - Speed controller off
The controller is deactivated or the torque-forming component is
zero.
1 -
Limits
for Motor/Generator Op.
The limitation of the speed controller assigns the upper limit to the
motor operation of the drive. Independent of the direction of
rotation, the same limit is used. The same applies in the case of
regenerative operation with the lower limit.
2 - Limits
for pos./neg. Torque
The assignment of the limit is done by the sign of the value to be
limited. Independent of the motor or generator operating points of
the drive, the positive limitation is done by the upper limit. The lower
limit is regarded as a negative limitation.
clockwise
anticlockwise
generator
motor
motor
generator
n
clockwise
anticlockwise
generator
motor
motor
generator
n
Operation mode 2
Current limit
728
Current limit generator op.
729
The properties of the speed controller can be adapted for adjustment and optimization of the
controller. The Amplification and Integral Time of the speed controller can be set via parameters
Amplification 1
721
and
Integral Time 1
722.
For the second speed range, you can set
parameters
Amplification 2
723
,
Integral Time 2
724
. The distinction between the speed ranges is done based
on the value selected with
parameter Speed Control Switch-Over Limit
738
. Parameters
Amplification 1
721
and
Integral Time 1
722
are not considered by the default parameter
Speed
Control Switch-Over Limit
738
. If parameter
Speed Control Switch-Over Limit
738
is set to a value
above 0.00 Hz, parameters
Amplification 1
721
,
Integral Time 1
722
will be active below the limit,
and parameters
Amplification 2
723
,
Integral Time 2
724
will be active above the limit.
Use the
Filter time constant
754
to filter the control deviation, if required. In this way, operation
with static control deviation and occasional undesired higher deviations can be stabilized. However,
this will affect the dynamic behavior when the load changes (speed change or changing torque
requirements).
The parameterized amplification at the current operating point can additionally be assessed via the
parameter
Backlash Damping
748
. In particular the small signal behavior in applications with a
gearbox can be improved by a value higher than zero percent.
Parameter
Backlash Damping
748
is available depending on the type of unit.
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