Toshiba Tosvert VF-AS1 - Manual (Page 140)

E6581301
F-28
6
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 H ) / 100
Gain1 needs to be set at 0 or a positive number.
If internal torque reference (%) < 0
Gain1 = (internal torque reference + dead band H ) / 100
Gain1 needs to be set at 0 or a negative number.
b) Gain by frequency after acceleration (Gain2)
If H < H
| Frequency after acceleration |
Frequency 1 set with H
Gain2 = 0
| Frequency after acceleration | > Frequency 2 set with H
Gain2 = Drooping gain H / 100
If frequency 1 H < | Frequency after acceleration | ≤ Frequency 2 H
If H ≧ H
| Frequency after acceleration |
Frequency 1 set with H
Gain2 = 0
If | Frequency after acceleration | > Frequency 1 H
Gain2 = Drooping gain H / 100
c) Drooping speed
Drooping speed = base frequency XN Note × Gain1 × Gain2
Note:If the base frequency exceeds 100 Hz, count it as 100 Hz.
6.16 Light-load high-speed operation function
H : Light-load high-speed operation
selection
H : Light-load high-speed learning
function
H : Automatic light-load high-speed
operation frequency
H : Light-load high-speed operation
switching lower limit frequency
H : Light-load high-speed operation
load waiting time
H : Light-load high-speed operation
load detection time
H : Light-load high-speed operation
heavy load detection time
H : Switching load torque during
power running
H : Heavy-load torque during power
running
H : Heavy-load torque during
constant-speed power running
H : Switching load torque during
regenerative braking
⇒ For details, refer to Instruction Manual (E6581327) specified in Section 6.41.
Gain2 = ×
(| Frequency after acceleration | – Frequency 1 H )
(Frequency 2 H – Frequency 1 H )
Drooping gain H
100