Toshiba TOSVERT VF-MB1 User Manual

E6581697
F-51
6
, The droop control function refers to the function of operating the power-running motor at operating
frequency f
1
(Hz) that is lower than command frequency f
0
(Hz) by droop frequency Δf (Hz) when the
torque current is T
1
(%). (See the above figure.)
 The droop frequency Δf can be calculated, using the following expression.
Droop frequency Δf (Hz)=base frequency
vl × f320× (Torque current T
1
- f323)
 When the torque current is above the specified droop insensitive torque band (f323), the frequency is
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.
 The droop function is activated above the torque current set with f323.
 The amount of droop frequency Δf varies depending on the amount of torque current T
1
.
Note: If the base frequency
vl exceeds 100Hz, count it as 100Hz.
Control is exercised between the starting frequency (
f240) and the maximum frequency (fh).
[An example of calculation]
Parameter setting: Base frequency
vl=60 (Hz), droop gain f320=10 (%)
Droop insensitive torque band
f323=30 (%)
Droop frequency Δf (Hz) and operating frequency f
1
when command frequency f
0
is 50 (Hz) and torque
current T
1
is 100 (%) are as follows.
Droop frequency Δf (Hz)=
vl × f320 × (T
1
- f323)
=60 (Hz) × 10 (%) × (100 (%) - 30 (%))
=4.2 (Hz)
Operation frequency f
1
(Hz) = f
0
- Δf = 50 (Hz) - 4.2 (Hz)=45.8 (Hz)
Power running

Toshiba TOSVERT VF-MB1 Specifications

General

Brand	Toshiba
Model	TOSVERT VF-MB1
Category	Inverter
Language	English