5-11
Torque Boost Function
5-11-1
Torque Boost
• The torque boost function is for increasing the output torque if it is not sufficient at lower speeds.
• This inverter provides two torque boost options: Manual torque boost for manual torque adjustment
and Automatic torque boost for automatic torque adjustment.
• Automatic torque boost is enabled when “0: IM V/f control,” “1: IM Dynamic torque vector control
without speed sensor,” “3: IM V/f control with speed sensor” or “4: IM Dynamic torque vector control
with speed sensor” is selected at Drive Control Selection (F42/A14).
• Manual torque boost is enabled when “0: IM V/f control” or “3: IM V/f control with speed sensor” is
selected at Drive Control Selection (F42/A14).
• The default is automatic torque boost set to enabled. (1st Torque Boost Function Selection
(E112)/2nd Torque Boost Function Selection (E113) = 1)
Parameter
No.
Function name Data Default data Unit
F42 1st Drive Control Selection 0: IM V/f control
1: IM Dynamic torque vector
control without speed sensor
3: IM V/f control with speed
sensor
4: IM Dynamic torque vector
control with speed sensor
0 -
A14 2nd Drive Control Selection
E112
1st Torque Boost Function Se-
lection
0: Manual torque boost
1: Automatic torque boost
1 -
E113
2nd Torque Boost Function Se-
lection
F09
1st Manual Torque Boost Volt-
age
0.0% to 20.0% (percentage
with respect to 1st Rated V
olt-
age at Base Frequency
(F05)/2nd Rated Voltage at
Base Frequency (A03))
1.9 %
A05
2nd Manual T
orque Boost Volt-
age
Related function Motor Capacity (P02/A16), Base Frequency (F04/A02), Rat-
ed V
oltage at Base Frequency (F05/A03), Motor Parameters
(P01/A15 to P03/A17 and P06/A20 to P20/A34)
Automatic Torque Boost (E112/E113 = 1)
• With this setting, the inverter increases the output voltage automatically depending on the load con-
dition.
• When automatic torque boost function is enabled, the non-linear V/f function is disabled.
• T
o use the automatic torque boost function, either set 1st Base Frequency (F04), 1st Rated Voltage
at Base Frequency (F05) and motor parameters (P01 to P03 and P06 to P95) to match the motor
capacity or motor characteristics, or execute auto-tuning (P04).
• To use automatic torque boost , set “1: Constant torque load” to 1st V/f Characteristics Selection
(F37) and 2nd V/f Characteristics Selection (A13). When “0: Variable torque load” is set, manual tor-
que boost is selected regardless of the setting of Torque Boost Function Selection (E112/E113).
5 Basic Settings
5-73
M1 Series Standard Type User's Manual (I669)
5-11 Torque Boost Function
5
5-11-1 Torque Boost