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5-39 5. [Fundamental operation] How to use parameters
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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.
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.
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 frequency (Hz)
Output voltage (V)
0
<vLv: Base frequency voltage 1>
<vL: Base frequency 1>
<vb> (%)
00
Output frequency (Hz)
Output voltage (V)
<vLv: Base frequency voltage 1>
<vL: Base frequency 1>
<vb> (%)
0
: Automatically
adjusted to torque
boost value
Output frequency (Hz)
Output voltage (V)
<vLv: Base frequency voltage 1>
<vL: Base frequency 1>
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