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332
WE KEEP THINGS MOVING
Optimize
15
Manual SD6
Activate the encoderless SVLC-HP control mode for AC motors with
B20
=
3
:SLVC-HP
.
Areas of application for the SLVC-HP are drives with
•
high accelerations,
•
changing loads and
•
large loads when the motor starts up.
The parameters
B46
,
B47
and
B48
are optimized during commissioning of the
SLVC-HP control mode. You can perform this automatically with the action
Optimize B45 SLVC-HP
(s. section 10.2.3.4 B45 action autotune SLVC).
If action
B45
can not be performed, note the following description for a manual
setting.
The quality of control of the SLVC-HP control mode also depends on how exact
the values
B52 stator inductance
,
B53 stator resistance
and
B54 leakage factor
are. For external motors, you can use the action
B41
to optimize these
parameters (s. section 10.2.3.3 B41 Autotuning).
Set B48 Integral Gain SLVC-HP
This parameter affects the dynamic properties of the motor. The larger
B48
is,
the faster the motor model can follow the actual speed.
The correct setting can be checked by means of the speed curve. If an encoder
is present during commissioning,
E15 n-motor encoder
should be considered,
otherwise
E91
.
If the motor can not follow the set speed ramp despite sufficiently large torque
limits,
B48
must be increased. Values that are too large lead to the fault
56:Overspeed
.
Set B47 Proportional Gain SLVC-HP
This parameter affects the dynamic properties of the motor (especially the
stability and overshoot behavior of the speed).
The correct setting can be checked by means of the speed curve. If an encoder
is present during commissioning,
E15
should be considered as the actual
speed, otherwise
E91
.
B47
should not be smaller than 1 % of
B48
. The drive
can become unstable for values that are too small. The resulting vibration
oscillates at the mechanical frequency. By increasing
B47
, overshoots in the
speed can be dampened. Values that are too large lead to vibrations in the
current and speed.
E07 n-post-ramp
E91 n-motor
E15 n-motor-encoder B48
or
(
too small)
E91 n-motor
E15 n-motor-encoder B48
or
(
too large)