Chapter 6 Parameter Description
-62-
frequency 2 is linear switching between two
groups of PI parameters.
PI
Parameter
Frequency Command
Fig.6-2 Schematic diagram of PI parameter
The speed dynamic response characteristics
of the vector control can be adjusted by
setting the proportional coefficient and
integration time of the speed regulator.
Increasing the proportional gain or reducing
the integration time can accelerate the
dynamic response of the speed loop.
However, if the proportional gain is too large
or the integration time is too short, it will cause
the oscillation of the system.
Recommended adjustment method:
If the factory default parameters cannot meet
the requirements, the relevant parameter
values can be subject to fine tuning.
Increase the proportional gain while ensuring
no oscillation to the system, and then reduce
the integration time to ensure that the system
has quick response characteristics and small
overshoot.
Note: Improper PI parameter setting may
cause too large speed overshoot. Voltage
fault may occur when the overshoot drops.
Vector
control slip
compensat
ion factor
Factory
default
value
100%
F2-06
Setup range
50%200%
The parameter is used to adjust steady speed
precision when loading to the motor: When
the motor is heavy loaded, the speed is lower,
the parameter shall be increased, otherwise,
decrease the parameter.
Vector
control speed
loop filter
time / V/F
control AVR
selection
Factory
default
value
0.002
s
F2-07
Setup range :0.000s 0.100s
In the vector control mode, the output of
speed loop regulator is torque current
command. This parameter is used to filter the
torque command. This parameter needs no
adjustment generally and this filter time can
be increased in case of huge speed
fluctuation. In case of oscillation of motor, this
parameter shall be reduced properly.
Under VF control, the parameter is the AVR
selection function code of VF.
0.000: Under VF control, AVR is always
disabled.
0.001: Under VF control, AVR is always
disabled.
0.002: Under VF control, AVR is disabled on at
the time of deceleration.
If the value of the function code is over 0.002,
handle it as 0.002.
In the V/F control mode, when it needs fast
stop and there is no brake resistor, selecting
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