LS ELECTRIC SV-iS7 Series, Руководство пользователя

Страница: 253 / 491

Learning Advanced Features
236
Code Description
is 300 and CON-31 S-Est P-Gain2 is 40.0%, the speed estimator P-gain at
higher than the actual medium speed is 120.
By default, the speed estimator gains are set according to the default
motor parameters and acceleration and deceleration times.
*Medium speed: A speed range that is approximately 50% of the base
frequency.
CON-34 SL2 OVM Perc
When the output voltage/input voltage ratio is below 100% (when the
output voltage is not over modulated), the output voltage bears linear
characteristics to the input voltage. In sensorless-2 control mode, you
can set CON-34 (SL2 OVM Perc) to define a voltage range to be limited in
the over modulated zone. By default, CON-34 (SL2 OVM Perc) is set as
120%. However, for a high-impact load where the load often exceeds
the torque limit, such as a press load, you can increase the limit value to
avoid frequent over current fault trips.
Also, in areas where the power supply is unstable, the input voltage
tends to be lower than the rated input voltage, which results in more
frequent overcurrent (OC1) fault trips with aforementioned high-impact
load applications. If this is the case, you can set CON-34 (SL2 OVM Perc)
as 140 – 150% to avoid frequent fault trips.
CON-48 ACR P-Gain,
CON-49 ACR I Gain
Sets the current PI controller P-gain and I-gain values.
DRV-10 Torque Control
Selects the speed control and torque control modes. If you set DRV-10
(Torque control) to
“ 1 (Yes) ”, the operation switches to torque control
mode.
Refer to
8.14 Torque Control on page 242 for details.
• Torque control is not available during low-speed regeneration and
low-speed operation under a light load. Select vector control mode
instead.
• When the inverter is operated in torque control mode, do not
switch between forward and reverse rotations. Overcurrent or Rx
deceleration fault trips may occur.
• When the inverter is operated in sensorless vector control mode,
enable accelerating speed search by setting the CON-71 (Speed
search) bits to
“ 0001, ” if the inverter is expected to start or restart
while the motor is free-running.
In sensorless-2 control mode, the motor may overheat or the system may become unstable if the
gain values are not properly set.