Braking Setting Functions - Toshiba TOSVERT VF-S11 Instruction Manual

✩ ✩ ✩ ✩ The droop control function refers to the function of operating the power-running motor at operating
frequency f
torque current is T
• The droop frequency ∆f can be calculated, using the following expression.
Droop frequency ∆f (Hz)=base frequency vl × f320× (Torque current T
• 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 ∆f varies depending on the amount of torque current T
Note:
[An example of calculation]
Parameter setting:Base frequency vl=60 (Hz), droop gain f320=10 (%)
6
Droop frequency ∆f (Hz) and operating frequency f
current T
Droop frequency ∆f (Hz)=vl × f320 × (T
Operation frequency f

6.15 Braking setting functions

• Function
Note:
(Hz) that is lower than command frequency f
1
(%). (See the above figure.)
1
If the base frequency vl exceeds 100Hz, count it as 100Hz.
Control is exercised between the starting frequency (f240) and the maximum frequency (fh).
Droop insensitive torque band f323=30 (%)
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
: Braking mode selection
: Release frequency
: Release time
: Creeping frequency
: Creeping time
Setting functions to control braking timing.
For these parameters, contact your nearest Toshiba inverter distributor.
(Hz) by droop frequency ∆f (Hz) when the
0
when command frequency f
1
- f323)
1
F-46
E6581158
- f323)
1
.
1
is 50 (Hz) and torque
0