5.3 Description of Function Codes
5-86
• Auto torque boost
This function automatically optimizes the output voltage to fit the motor with its load. Under light load, auto torque
boost decreases the output voltage to prevent the motor from over-excitation. Under heavy load, it increases the
output voltage to increase the output torque of the motor.
• This function controls in accordance with motor characteristics. Therefore, set the base frequency 1
(F04), rated voltage at base frequency
1 (F05), and other pertinent motor parameters (P01 through
h P99) in line with the motor capacity and characteristics, or else perform
When a special motor is driven or the load does not have sufficient rigidity, the maximum torque might
decrease or the motor operation might become unstable. I
n such cases, do not use auto torque boost
but choose manual torque boost using F09 (F37 = 0 or 1).
F38, F39
Stop frequency (Detection mode and holding time) Refer to F23.
For details about the setting of the stop frequency (detection mode and holding time), refer to the description of
F23.
F40, F41
Torque limiter 1 (Driving), Torque limiter 1 (Braking)
Related function codes:
E16, E17 Torque limiter 2 (Driving), Torque limiter 2 (Braking)
H74 Torque limiter (Control target)
H76 Torque control (Braking) (Frequency rising limit for braking)
Under V/f control (F42=0,1,2,3,4)
If the inverter output torque exceeds the specified levels of the torque limiters (F40, F41, E16, E17, and E61 to
E63), the inverter controls the output frequency and limits the output torque for preventing a stall.
To use the torque limiters, it is necessary to configure the function codes listed in Table 5.3-5.
In braking, the inverter increases the output frequency to limit the output torque. Depending on the
conditions during operation, the output frequency could dangerously increase. H76 (Frequency rising
limit for braking) is provided to limit
the increasing frequency component.
Table 5.3-5 Related function codes
Function
code
Name V/f control Remarks
F40 Torque limiter 1 (Driving) Y
F41 Torque limiter 1 (Braking) Y
E16 Torque limiter 2 (Driving) Y
E17 Torque limiter 2 (Braking) Y
H74 Torque limiter (Control target) N
H76 Torque limiter (Frequency rising limit for braking) Y
E61 to E63
Terminal [12], [C1] (C1 function) • (V2 function)
Extension function selection
Y
7: Analog torque limit value A
8: Analog torque limit value B
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