Fuji Electric FRENIC-HVAC User Manual page 385

F37 Load Selection/Auto Torque Boost/Auto Energy Saving Operation 1
F09 specifies the torque boost level in order to assure sufficient starting torque.
F37 specifies V/f pattern, torque boost type, and auto energy saving operation in accordance
with the characteristics of the load.
Data for
V/f pattern
F37
Variable
0 torque V/f
pattern
1
Linear
V/f pattern
2
Variable
3 torque V/f
pattern
4
Linear
V/f pattern
5
If a required "load torque + acceleration toque" is more than 50% of the motor rated
torque, it is recommended to select the linear V/f pattern (factory default).
V/f characteristics

The FRENIC-HVAC series of inverters offer a variety of V/f patterns and torque boosts,
which include V/f patterns suitable for variable torque load such as general fans and pumps
and for constant torque load (including special pumps requiring high starting torque). Two
types of torque boosts are available: manual and automatic.
Variable torque V/f pattern (F37 = 0)
Auto energy
Torque boost
saving
Torque boost
specified by F09
Disable
Auto torque
boost
Torque boost
specified by F09
Enable
Auto torque
boost
6-75
6.3 Details of Function Codes
F09 (Torque Boost 1)
Applicable load
Variable torque load
(General-purpose fans and pumps)
Constant torque load
Constant torque load
(To be selected if a motor may be
over-excited at no load.)
Variable torque load
(General-purpose fans and pumps)
Constant torque load
Constant torque load
(To be selected if a motor may be
over-excited at no load.)
Linear V/f pattern (F37 = 1)