4-24
Torque boost
A correctly installed motor and careful attention to voltage
drop in the wiring will improve the motor torque at low speed.
Setting of A041/A241 will select between manual torque
boost and automatic torque boost, the level of torque boost
corresponds to the set motor capacity selection (H003/H203)
and the motor pole selection (H004/H204).
Set item
Function code
Data
Contents
00
Manual torque boost
Torque boost
A041/A241
01
Automatic torque boost
Manual torque boost
A042/A242
0.0-20.0
Unit:
%
Level corresponding to output Voltage
(100%)
Manual torque boost break point
A043/A243
0.0-50.0
Unit:
%
Level corresponding to base frequency
(1) Manual torque boost
The values set up with A042/A242 and A043/A243 is outputted.
A042/A242 sets a percentage level where the base frequency voltage is 100%.
The level set is the value of torque boost output voltage at 0 Hz.
When using the manual torque boost, it should be noted that overuse will cause saturation of the motor and
may cause damage.
The manual torque boost break point is the frequency at which the voltage torque boost is switched off and
normal operation resumes.
To change from A041and A042 to A241and A242 an intelligent input needs to be set to 08(SET) and switched
on.
(2) Automatic torque boost
The output voltage is adjusted automatically by the condition of the load.
When using automatic torque boost it is important that the following two parameters are set correctly.
Set item
Function code
Setting limit
Contents
0.20-75.0(11 to 75kW)
Motor capacity selection
H003/H203
0.20-160.0(90 to 132kW)
Unit : kW
Motor pole selection
H004/H204
2/4/6/8
Unit : pole
A041/A241: 1
st
/2
nd
torque boost selection
A042/A242:1
st
/2
nd
manual operation torque boost
A043/A243:1
st
/2
nd
manual operation torque boost
break point
H003/H203:1
st
/2
nd
motor capacity selection
H004/H204:1
st
/2
nd
motor pole selection
Relation code
Output frequency
Base frequency
(100%)
A042/A242
A043/A243
100
Output voltage (%)
Chapter4 Explanation of function
