Drooping Control - Toshiba TOSVERT VF-P7 Instruction Manual

6.14 Drooping control

 ：Drooping gain
 ：Speed at a drooping gain 0%
 ：Speed at the drooping gain 
 ：Drooping insensitive torque band
 ：Output filter for drooping
・Function
When operating a single load with more than one inverter and one motor, these parameters distribute
the load to the inverters. These parameters can adjust the frequency range, the insensitive torque band
and gains.
Ｇａｉｎ１
[Parameter setting]
Title
Drooping gain

Speed at a drooping gain 0[%]

Speed at the drooping gain 

Drooping insensitive torque band

Output filter for drooping

・When torque larger than the dead band torque is applied, the frequency is decreased (during power
running) or increased (during regenerative braking).
・Drooping takes effect within the frequency range above the frequency set with .
・In the frequency range between  and , the drooping rate varies with the torque.
The change in the frequency during drooping can be calculated as described below.
a) Gain by internal torque reference (Gain 1)
If internal torque reference [%]≧0
Gain1 ＝（internal torque reference−dead band
Grain 1 needs to be set at 0 or a positive number.
If internal torque reference [%]＜0
Gain1 ＝（internal torque reference＋dead band
Grain 1 needs to be set at 0 or a negative number.
b) Gain by frequency after acceleration (Gain 2)
If
 ＜
｜Frequency after acceleration｜≦Frequency 1 set with
Gain2 ＝ 0
｜Frequency after acceleration｜＞Frequency 2 set with
Gain2 ＝ Drooping gain
Drooping
gain
Internal torque reference
Dead band
Function


F-30
Ｇａｉｎ２


− 
Dead band
Adjustment range
∼ [%]
∼ [Hz]
∼ [Hz]
∼ [%]
∼ [rad/s]
 ）/ 100
 ）/ 100


/ 100
Drooping
gain
 Frequency

− 
Default setting




