4-21
4-2 Function Mode
4
Functions
Automatic Torque Boost
•If the automatic torque boost is selected in the torque boost selection (A041/A241: 01), it operates
to adjust the output frequency and voltage automatically, depending on the load level.
(In actual control, the automatic torque boost is used along with the manual torque boost.)
•To select the automatic torque boost, set motor capacity selection H003/H203 and motor pole
number selection H004/H204 correctly according to your motor.
•To avoid a possible overcurrent trip during deceleration, set the AVR selection to "Always ON"
(A081: 00).
•If the automatic torque boost cannot provide the desired characteristics, adjust each item, as
shown in the following table.
Control Method (V/f Characteristics)
You can set V/f characteristics (output voltage/output frequency).
* To switch to the 2nd/3rd control, allocate 08 (SET)/17 (SET3) to the desired multi-function input and then turn it
on.
*1. Refer to "Sensorless Vector Control" (page 4-114).
*2. Refer to "0-Hz Sensorless Vector Control" (page 4-115).
Phenomenon Adjusting method Adjustment item
Insufficient torque at low
speed
(Motor does not run at low
speed.)
Gradually increase the voltage setting of the manual torque boost. A042/A242
Gradually increase the slip compensation gain of the automatic
torque boost.
A047/A247
Gradually increase the voltage compensation gain of the automatic
torque boost.
A046/A246
Reduce the set value of the carrier frequency. b083
Rotation speed lowers
when load is applied.
Gradually increase the slip compensation gain of the automatic
torque boost.
A047/A247
Rotation speed increases
when load is applied.
Gradually reduce the slip compensation gain of the automatic torque
boost.
A047/A247
Overcurrent trip occurs
when load is applied.
Gradually reduce the voltage compensation gain of the automatic
torque boost.
A046/A246
Gradually reduce the slip compensation gain of the automatic torque
boost.
A047/A247
Gradually reduce the voltage setting of the manual torque boost. A042/A242
Parameter No. Function name Data Default setting Unit
A044
V/f characteristics
selection
00: Constant torque characteristics (VC)
01: Special reduced torque
characteristics (Special VP)
02: Free V/f characteristics
(Only A044/A244 can be set.)
03: Sensorless vector control (SLV)
(Only A044/A244 can be set.
*1
)
04: 0-Hz sensorless vector control
(Only A044/A244 can be set.
*2
)
05: Sensor vector control (V2)
(Only A044 can be set.)
00 A244
*2nd V/f characteristics
selection
A344
*3rd V/f characteristics
selection
Related functions A046, A246, A047, A247, A082, H003, H203, H004, H204
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