5.4 Details of Function Codes
5-104
F37
Load Selection/Auto Torque Boost/Auto Energy Saving Operation 1
Related function codes: F09 (Torque Boost 1)
H67 (Auto Energy Saving Operation, Mode selection)
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.
Table 5.4-40
Data
for F37
V/f pattern Torque boost
Auto energy
saving
operation
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.)
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).
y Under 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.)
Table 5.4-41
Data for F37 Enable
0 to 2
Auto energy saving operation
OFF
3 to 5
Auto energy saving operation
ON
y Under vector control without speed sensor, both F37 and F09 are disabled. The auto energy
saving operation is also disabled.
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