5.3 Description of Function Codes 5.3.8 J codes (Applied functions)
Torque limiting P (Gain) (J90)
If the torque limiting operation response is slow when the stopper contact function is selected, increase the gain,
and if hunting occurs, decrease the gain.
Torque limiting I (Integral time) (J91)
If the torque limiting operation response is slow when the stopper contact function is selected, decrease the integral
time, and if hunting occurs, increase the integral time.
Current command level (J92)
Compensates the current command during current control with the stopper contact function. By increasing the
setting value, the holding torque increases, but an inverter overload alarm (OLU) or motor overload alarm (OL1)
may occur, possibly resulting in mechanical system vibration.
[ 6 ] Brake control signal
J68 to J72
J95, J96
H180
d120 to d125
Brake signal (Brake-release current, Brake-release frequency/speed, Brake-release
timer, Brake-apply frequency/speed, Brake-apply timer)
Brake signal (Brake-release torque, Operation selection)
Brake signal (Brake signal operation check time)
For brake signal reverse rotation (Brake-release current, Brake-release
frequency/speed, Brake-release timer, Brake-release torque, Brake-apply
frequency/speed, Brake-apply timer)
Related function codes: A98, b98, r98: Motor 2 to 3 (Function selection)
The brake (release/apply) control signal is useful for lift application such as a hoist. This signal is adjustable with
these function codes. It is possible to set the release and apply conditions based of these signals (current,
frequency) so that a hoisted load does not fall down at the start or stop of the operation, or so that the load applied
to the brake is reduced. The inverter is also equipped with dedicated reverse rotation function codes, allowing
individually adjustments to be made with forward rotation or reverse rotation if conditions differ when rising and
falling.
Brake signal “BRKS” assignment (Function code E20 to E24, E27, data = 57)
This signal outputs a brake control command that releases or applies the brake.
Releasing the Brake
When the inverter output current and output frequency exceeds the specified level for the brake control signal
(J68/J69/J95) for the period specified by J70 (Brake control signal (Brake-release timer)), the inverter judges that
required motor torque is generated and turns the signal BRKS ON for releasing the brake.
This prevents a hoisted load from falling down due to an insufficient torque when the brake is released.
Set the inverter rated current as
100 %.
Brake-release
frequency/speed
Set the motor rated torque as
100 %.
Note: Resolution of each function code is different from the FRENIC-MEGA (G1).
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