Instruction manual

8-4
8.4 Load Selection / Auto Torque Boost / Auto Energy Saving Operation (F27, Default 1)
This parameter sets the load type and auto torque boost setting, including auto energy savings.
F37 specifies V/f pattern, torque boost type, and auto energy saving operation in accordance with the characteristics
of the load.
Specify the torque boost level with F09 in order to assure sufficient starting torque.
To set parameter F37:
- Press PRG key, next select QUICK SET or DATA SET with UP/DOWN and keys and press the
FUNC/DATA key.
- In the parameter list move cursor to F37 with UP/DOWN keys and press FUNC/DATA key to select.
Data for
F37
V/f pattern
Torque boost
Auto energy
saving
Applicable load
0
Variable torque
V/f pattern
Torque boost
specified by F09
Disable
Variable torque load
(General-purpose fans and pumps)
1
Linear
V/f pattern
Constant torque load
2
Auto torque boost
Constant torque load
(To be selected if a motor may be
over-excited at no load.)
3
Variable torque
V/f pattern
Torque boost
specified by F09
Enable
Variable torque load
(General-purpose fans and pumps)
4
Linear
V/f pattern
Constant torque load
5
Auto torque boost
Constant torque load
(To be selected if a motor may be
over-excited at no load.)
If a required "load torque + acceleration toque" is more than 50% of the constant torque, it is
recommended to select the linear V/f pattern (factory default).
• Under the vector control with speed sensor, F37 is used to specify whether the auto energy saving
operation is enabled or disabled. (V/f pattern and torque boost are disabled.)
Data for F37
Operation
0 to 2
Auto energy saving operation OFF
3 to 5
Auto energy saving operation ON
• Under the vector control without speed sensor, both F37 and F09 are disabled. The auto energy saving
operation is also disabled.
 V/f characteristics
The EQ7 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 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)
Linear V/f pattern (F37 = 1)
F37
Load Selection / Auto Torque Boost / Auto Energy Saving Operation 1
(F09)
(F09)