Chapter 6 - Parameter Description [AFN]
6-34
AFN-64: Pre-excitation Time
When the start command (FWD or REV) is issued, the
drive will pre-excite the motor automatically for the
time specified by this parameter. This function is used
in order to fully magnetize the motor so that full torque
can be produced immediately upon starting the motor.
After AFN-64 [Pre-excitation Time] elapses the drive
will start normal operation as shown in the following
graph.
Param
LCD
display
Factory
setting
Setting
range
AFN-64 PreExTime 1 [sec] 0 ~ 60 [sec]
Pre-exite time
AFN-65: P Gain for Sensorless Control
AFN-66: I Gain for Sensorless Control
SL P-gain is the proportional gain of the speed loop
controller during Sensorless Vector control. If this
value is set high, you can get fast speed response
characteristics. However, if this value is set too high,
the steady state characteristics may become unstable.
The default settings are typically acceptable, and this
parameter should only be changed to increase the
performance of the system.
SL I-gain is the integral gain of the speed loop
controller during Sensorless Vector control. If this
value is set low, you can get better transient response
characteristics and steady state characteristics.
However, if this value is set too low, there may be an
overshoot in speed control. The default settings are
typically acceptable, and this parameter should only be
changed to increase the performance of the system.
Note: The response time of a system is affected by
the load inertia. For better control performance, set
AFN-46 [Load Inertia] correctly.
AFN
►
SL P-gain
65 3000
Factory Default: 3000
AFN
►
SL I-gain
66 1000
Factory Default: 1000
FX-CM
Output Freq
[Hz]
Output
Voltage [V]
T1 = Pre-excitation time
AFN
► PreExTime
64 1.0 sec
Factory Default: 1.0 sec
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