Automatic Torque Boost - Omron SYSDRIVE RX Series User Manual

4-2 Function Mode

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.
Phenomenon
4
Insufficient torque at low
speed
(Motor does not run at low
speed.)
Rotation speed lowers
when load is applied.
Rotation speed increases
when load is applied.
Overcurrent trip occurs
when load is applied.
Control Method (V/f Characteristics)
You can set V/f characteristics (output voltage/output frequency).
Parameter No.
A044
A244
A344
Related functions
* 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 4-113).
*2. Refer to "0-Hz Sensorless Vector Control" (page 4-114).
4-21
Gradually increase the voltage setting of the manual torque boost.
Gradually increase the slip compensation gain of the automatic
torque boost.
Gradually increase the voltage compensation gain of the automatic
torque boost.
Reduce the set value of the carrier frequency.
Gradually increase the slip compensation gain of the automatic
torque boost.
Gradually reduce the slip compensation gain of the automatic torque
boost.
Gradually reduce the voltage compensation gain of the automatic
torque boost.
Gradually reduce the slip compensation gain of the automatic torque
boost.
Gradually reduce the voltage setting of the manual torque boost.
Function name
00: Constant torque characteristics (VC)
V/f characteristics
01: Special reduced torque
selection
02: Free V/f characteristics
*2nd V/f characteristics
03: Sensorless vector control (SLV)
selection
04: 0-Hz sensorless vector control
*3rd V/f characteristics
05: Sensor vector control (V2)
selection
Adjusting method
Data
characteristics (Special VP)
(Only A044/A244 can be set.)
(Only A044/A244 can be set.
(Only A044/A244 can be set.
(Only A044 can be set.)
A046, A246, A047, A247, A082, H003, H203, H004, H204
Adjustment item
A042/A242
A047/A247
A046/A246
A047/A247
A047/A247
A046/A246
A047/A247
A042/A242
Default setting
00
*1
)
*2
)
b083
Unit
⎯