5.3 Description of Function Codes
5-84
F37
Load Selection/Auto Torque Boost/Auto Energy Saving Operation 1
Related function codes: F09 Torque boost 1
F37 specifies V/f pattern, torque boost type, and auto energy saving operation in accordance with the
characteristics of the load.
F37
data
V/f characteristics Torque boost
Auto Energy-
Operation
Applicable load
0
Variable torque V/f
pattern
By F09 torque
boost
Disabled
Variable torque load
(General-purpose fan 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
By F09 torque
boost
Enabled
Variable torque load
(General-purpose fan 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 50% or more of the rated torque, it is recommended to
select the linear V/f pattern.
Factory defaults are set to linear V/f pattern.
■ V/f characteristics
The FRENIC-Ace 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) Linear V/f pattern (F37 = 1)
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