Toshiba TOSVERT VF-AS1 Instruction Manual page 70

1) Increasing torque automatically according to the load
Set the automatic torque boost
Automatic torque boost
from inverter. This gives steady torque for stable runs.
Note 1: The same characteristic can be obtained by setting the V/f control mode selection parameter
Note 2: Setting
Note 3: The accuracy of auto-tuning 1 can be increased by specifying
2) When using vector control (increasing starting torque and high-precision operations)
Set the automatic torque boost
Setting automatic torque boost
bringing out the maximum in motor characteristics from the low-speed range. This suppresses changes in motor
speed caused by fluctuations in load to provide high precision operation. This setting is most suitable for transfer and
lifting systems that are operated in speed control mode.
Note 1: The same characteristic can be obtained by setting the V/f control mode selection parameter
Note 2: Setting
5
If vector control cannot be programmed....
First read the precautions about vector control in 5.6, 8).
1) If the desired torque cannot be obtained
2) If auto-tuning error "
(automatic torque boost) and
Automatic torque boost is the parameter for setting V/F control mode selection (
together. That is why all parameters related to change automatically when
Deselect (Always
Automatic torque boost+auto-tuning 1
Sensorless vector control 1+auto-tuning 1
3) Increasing torque manually (V/f constant control)
The VF-AS1 inverter is set to this control mode by factory default.
This is the setting of constant torque characteristics that are suited for such things as conveyors. It can also be used
to manually increase starting torque.
To return to V/f constant control after changing the
Set the V/f control mode selection parameter
Note:If you want to increase torque further, raise the setting value of manual torque boost
= detects load current in all speed ranges and automatically adjusts voltage output
(automatic torque boost) and
to automatically programs
frequency voltage), (Motor rated capacity),
rated rotational speed) indicated in the motor name plate.
=
(Sensorless vector control 1) and
to automatically programs
" appears
is displayed.)
How to set manual torque boost parameter
= (automatic torque boost+auto-tuning 1)
(auto-tuning 1) to .
to .
(Motor rated current), and
= (sensorless vector control 1+auto-tuning 1)
(Sensorless vector control 1+auto-tuning 1) provides high starting torque
(Auto-tuning 1) to
to .
⇒ Refer to 6.22 selection 3.
⇒ Refer to 6.22 selection 3.
(V/f control mode selection)
Automatically programmed parameters
Check the programmed value
of . (If
–
changed, it becomes
constant).)
Automatic torque boost
Sensorless vector control 1
setting:
=
E-4
⇒ Refer to Section 6.22.
(Base frequency), (Base
⇒ Refer to Section 6.22.
.
) and auto-tuning 1 (
is changed.
is not
(V/F
Executed (
execution)
Executed (
execution)
(constant torque characteristic).
⇒ Refer to Section 5.6.
.
⇒ Refer to Section 5.7.
E6581301
to
(Motor
to
)
–
after
after