5-26
F09
F37
Torque Boost 1
Load Selection/Auto Torque Boost/Auto Energy Saving Operation 1
F37 specifies V/f pattern, torque boost type, and auto energy saving operation for optimizing
the operation in accordance with the characteristics of the load. F09 specifies the type of
torque boost in order to provide sufficient starting torque.
Data for
F37
V/f pattern
Torque boost
(F09)
Auto energy
saving
Applicable load
0 Variable
torque V/f
pattern
Variable torque load
(General purpose fans and pumps)
1
Torque boost
specified by
F09
Constant torque load
2
Linear
V/f pattern
Auto torque
boost
Disable
Constant torque load
(To be selected if a motor may be
over-excited at no load.)
3 Variable
torque V/f
pattern
Variable torque load
(General purpose fans and pumps)
4
Torque boost
specified by
F09
Constant torque load
5
Linear
V/f pattern
Auto torque
boost
Enable
Constant torque load
(To be selected if a motor may be
over-excited at no load.)
Note:
If a required "load acceleration toque" is more than 50% of the rated torque, it
is recommended to select the linear V/f pattern (factory default).
V/f characteristics
The FRENIC-Mini series of inverters offers 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 or for
special pump load requiring high starting torque. Two types of torque boost are available:
manual and automatic.
Variable torque V/f pattern (F37 = 0)
Linear V/f pattern (F37 = 1)
When the variable torque V/f pattern is selected (F37 = 0 or 3), the output voltage
may be low and insufficient voltage output may result in less output torque of the
motor at a low frequency zone, depending on some characteristics of the motor itself
and load. In such a case, it is recommended to increase the output voltage at the low
frequency zone using the non-linear V/f pattern (H50, H51).
Recommended value: H50 =
H51 =
1/10 of the base frequency
1/10 of the voltage at base frequency
