Toshiba TOSVERT VF-FS1 Instruction Manual page 136

The droop control function refers to the function of operating the power-running motor at operating
• The droop frequency ∆f can be calculated, using the following expression.
• When the torque current is above the specified droop insensitive torque band (
• The droop function is activated above the torque current set with
• The amount of droop frequency ∆f varies depending on the amount of torque current T
Note:
[An example of calculation]
Parameter setting:Base frequency
6
Droop frequency ∆f (Hz) and operating frequency f
current T
Droop frequency ∆f (Hz)=
Operation frequency f
frequency f (Hz) that is lower than command frequency f
1
torque current is T (%). (See the above figure.)
1
Droop frequency ∆f (Hz)=base frequency
reduced during power running or increased during regenerative braking. The above figure shows an
example of the operating frequency during power running. During regenerative braking, control is
performed in such a way as to increase the frequency.
If the base frequency
Control is exercised between the starting frequency (
Droop insensitive torque band
is 100 (%) are as follows.
1
×
=60 (Hz) × 10 (%) × (100 (%) - 30 (%))
=4.2 (Hz)
(Hz) = f - ∆f = 50 (Hz) - 4.2 (Hz)=45.8 (Hz)
1 0
(Hz) by droop frequency ∆f (Hz) when the
0
× × (Torque current T
exceeds 100Hz, count it as 100Hz.
=60 (Hz), droop gain
=30 (%)
when command frequency f
1
× (T - )
1
F-40
- )
1
), the frequency is
.
.
1
) and the maximum frequency (
=10 (%)
is 50 (Hz) and torque
0
E6581381
).