Light-Load High-Speed Operation Function - Toshiba TOSVERT VF-AS1 Instruction Manual

• 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 (%)
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.
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 
6
| 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.
6.16

Light-load high-speed operation function

 : Light-load high-speed operation
 : Light-load high-speed learning
 : Automatic light-load high-speed
 : Light-load high-speed operation
 : Light-load high-speed operation
 : Light-load high-speed operation
 : Light-load high-speed operation
⇒ For details, refer to Instruction Manual (E6581327) specified in Section 6.42.
0
<

Frequency 1 set with
/ 100

 < | Frequency after acceleration |
Drooping gain (| Frequency after acceleration | – Frequency 1

×
100

Frequency 1 set with
/ 100


selection
function
operation frequency
switching lower limit frequency
load waiting time
load detection time
heavy load detection time
 ) / 100
 ) / 100


Frequency 2
(Frequency 2 – Frequency 1



Note
× Gain1 × Gain2
 : Switching load torque during
power running
 : Heavy-load torque during power
running
 : Heavy-load torque during
constant-speed power running
 : Switching load torque during
regenerative braking
F-28
E6581445

 )
 )