Toshiba TOSVERT VF-PS1 Instruction Manual page 143

[Parameter setting]
Title
Note: Drooping gain can be changed within a range of 0.1 to 100.0% during operation. When changing the setting
to 0.0 (no drooping) or 0.0, stop operation.
• Drooping control can be performed only when
• When torque over the insensitive torque is applied, the frequency is decreased (during power running) or
increased (during regenerative braking).
• The drooping function is operative at frequencies over the frequency set with
• In the frequency range between the frequencies set with
according to the magnitude of frequency.
• The error in drooping insensitive torque increases in the frequency range above the base frequency, and it is
therefore recommended that these functions be used at frequencies below the base frequency.
• During drooping control, the output frequency is not restricted by the maximum frequency (
The change in frequency at the time of drooping can be calculated, as described below:
a) Gain by internal torque reference (Gain1)
If internal torque reference (%) ≧ 0
Gain1 = (internal torque reference - dead band
Gain1 needs to be set at 0 or a positive number.
If internal torque reference (%) < 0
Gain1 = (internal torque reference + dead band
Gain1 needs to be set at 0 or a negative number.
6
b) Gain by frequency after acceleration (Gain2)
If
| Frequency after acceleration |
Gain2 = 0
| Frequency after acceleration | > Frequency 2 set with
Gain2 = Drooping gain
If frequency 1
Gain2 =
If
| Frequency after acceleration |
Gain2 = 0
If | Frequency after acceleration | > Frequency 1
Gain2 = Drooping gain
c) Drooping speed
Drooping speed = base frequency
Note: If the base frequency exceeds 100 Hz, count it as 100 Hz.
Function
Drooping gain [Note]
Speed at drooping gain 0%
Speed at drooping gain
Drooping insensitive torque
Drooping output filter
<
Frequency 1 set with
/ 100
< | Frequency after acceleration |
Drooping gain (| Frequency after acceleration | – Frequency 1
×
100
≧
Frequency 1 set with
/ 100
Adjustment range
~ %
~ Hz
~ Hz
~ %
~ rad/s
is set to or .
and
) / 100
) / 100
Frequency 2
(Frequency 2 – Frequency 1
Note
× Gain1 × Gain2
F-28
E6581531
Default setting
.
, the degree of drooping changes
).
)
)