Fuji Electric FRENIC-MEGA - Related Function Codes; Torque Limit Control Mode

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• Use auto energy saving only where the base frequency is 60 Hz or lower. If the base frequency is set at 60
Hz or higher, you may get a little or no energy saving advantage. The auto energy saving operation is
designed for use with the frequency lower than the base frequency. If the frequency becomes higher than
the base frequency, the auto energy saving operation will be invalid.
• Since this function relies also on the characteristics of the motor, set the base frequency 1 (F04), the rate
d
voltage at base frequency 1 (F05), and other pertinent motor parameters (P01 through P03 and P06 through
P99) in line with the motor capacity and characteristics, or else perform auto-tuning (P04).
• Under the vector control without speed sensor, the auto energy saving operation is disabled.
F38, F39 Stop frequency (Detection mode, Holding time) (Refer to F23.)
F40, F41 Torque Limiter 1-1, E16, E17 Torque Limiter 2-1, Torque Limiter 2-2
Torque Limiter 1-2
H73 Torque Limiter (Operating conditions)
H76 Torque Limiter (Frequency increment limit for braking)
Under V/f control
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 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 the table below.
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 increment limit fo
r
braking) is provided to limit the increasing frequency component.
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 limit control mode
Torque limit is performed by limiting torque current flowing across the motor.
The graph below shows the relationship between the torque and the output frequency at the constant torque current
limit.
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