Toshiba TOSVERT VF-AS3 Instruction Manual page 205

<vLv: Base frequency voltage 1>
To increase the torque at low speeds, increase the setting value of <vb: Manual torque boost 1>. For
details, refer to [5. 3. 6].
1: Variable torque
This is applied to loads such as fans, pumps and blowers in which the torque is proportional to the
square of load motor speed.
<vLv: Base frequency voltage 1>
2: Automatic torque boost
The load current in the speed range from startup to base frequency is detected and the output
voltage (torque boost) from the inverter is automatically adjusted. This gives steady torque for stable
operation.
It is applied to loads that require torque.
<vLv: Base frequency voltage 1>
: Automatically
adjusted to torque
boost value
Operation may become unstable depending on loads. In this case, set <Pt> = "0: V/f constant" and
increase the value of <vb: Manual torque boost 1>.
Setting of motor parameters
When <Pt> is "2", setting of motor parameters is required.
Output voltage (V)
<vb> (%)
0
<vL: Base frequency 1>
Output voltage (V)
<vb> (%)
0 0
<vL: Base frequency 1>
Output voltage (V)
0
<vL: Base frequency 1>
5-39
Output frequency (Hz)
Output frequency (Hz)
Output frequency (Hz)
5. [Fundamental operation] How to use parameters
E6582062
3
4
5
9