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Torque limiter (Operating conditions) (H73)
H73 specifies whether the torque limiter is enabled or disabled during acceleration/deceleration and running at constant
speed.
Data for H73 During accelerating/decelerating During running at constant speed
0 Enable Enable
1 Disable Enable
2 Enable Disable
Torque limiter (Frequency increment limit for braking) (H76) Data setting range: 0.0 to 500.0 (Hz)
H76 specifies the increment limit of the frequency in limiting torque for braking. The factory default is 5.0 Hz. If the
increasing frequency during braking reaches the limit value, the torque limiters no longer function, resulting in an
overvoltage trip. Such a problem may be avoided by increasing the setting of H76.
The torque limiter and current limiter are very similar function each other. If both are activated concurrently,
they may conflict each other and cause hunting in the system. Avoid concurrent activation of these limiters.
Under vector control without/with speed sensor
If the inverter’s output torque exceeds the specified levels of the torque limiters (F40, F41, E16, E17, and E61 to E63),
the inverter controls the speed regulator's output (torque command) in speed control or a torque command in torque
control in order to limit the motor-generating torque.
To use the torque limiters, it is necessary to configure the function codes listed in the table below.
Related function codes
Function code Name V/f control Vector control Remarks
F40 Torque Limiter 1-1 Y Y
F41 Torque Limiter 1-2 Y Y
E16 Torque Limiter 2-1 Y Y
E17 Torque Limiter 2-2 Y Y
H73 Torque Limiter (Operating conditions) Y Y
H74 Torque Limiter (Control target) N Y
H75 Torque Limiter (Target quadrants) N Y
H76
Torque Limiter
(Frequency increment limit for braking)
Y N
E61 to E63
Terminal [12] Extended Function
Terminal [C1] Extended Function
Terminal [V2] Extended Function
Y Y
7: Analog torque limit value A
8: Analog torque limit value B
Torque Limiter (Control target) (H74)
Under vector control, the inverter can limit motor-generating torque or output power, as well as a torque current
(default).
Data for H74 Control target
0 Motor-generating torque limit
1 Torque current limit
2 Output power limit
Torque
Speed
Torque pattern when the torque
current limit is 100% rating
Torque pattern when the
torque limit is 50% rating
Torque pattern when the
power limit is 50% rating
100% rating
100% rating
50% rating
200% rating
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