E6581528
F-28
6
• 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 ) / 100
Gain1 needs to be set at 0 or a positive number.
If internal torque reference (%) < 0
Gain1 = (internal torque reference + dead band ) / 100
Gain1 needs to be set at 0 or a negative number.
b) Gain by frequency after acceleration (Gain2)
If <
| Frequency after acceleration |
Frequency 1 set with
Gain2 = 0
| Frequency after acceleration | > Frequency 2 set with
Gain2 = Drooping gain / 100
If frequency 1 < | Frequency after acceleration |
Frequency 2
If ≧
| Frequency after acceleration |
Frequency 1 set with
Gain2 = 0
If | Frequency after acceleration | > Frequency 1
Gain2 = Drooping gain / 100
c) Drooping speed
Drooping speed = base frequency
Note
× Gain1 × Gain2
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
selection
:
Light-load high-speed learning
function
:
Automatic light-load high-speed
operation frequency
:
Light-load high-speed operation
switching lower limit frequency
:
Light-load high-speed operation
load waiting time
:
Light-load high-speed operation
load detection time
:
Light-load high-speed operation
heavy load detection time
:
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
⇒ For details, refer to Instruction Manual (E6581327) specified in Section 6.42.
Gain2 = ×
(| Frequency after acceleration | – Frequency 1
)
(Frequency 2
– Frequency 1
)
Drooping gain
100
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