5.4 Details of Function Codes
5-229
Details of
Function Codes
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J56 to J96
d codes
U codes
y codes
Chapter 5 Function Code
J68 to J70
J71, 72
J95, 96
Brake Signal (Brake-OFF Current, Brake-OFF Frequency/Speed, Brake-OFF Timer)
Brake Signal (Brake-ON Frequency/Speed, and Brake-ON Timer)
Brake Signal (Brake-OFF Torque, Operation Selection)
These function codes are for the brake releasing/turning-on signals of vertical carrier machines.
It is possible to set the conditions of the brake releasing/turning-on signals (current, frequency or torque) 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.
Assignment of brake signal BRKS (Function code: E20 to E24, E27 data = 57)
This signal outputs a brake control command that releases or activates the brake.
Releasing the Brake
When any of the inverter output current, output frequency, or torque command value exceeds the specified
level of the brake signal (J68/J69/J95) for the period specified by Brake signal (Brake-OFF timer) (J70), 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.
Table 5.4-157
Function
Code
Name Setting range Remarks
J68
Brake-OFF current
0 to 300%: Set it putting the
inverter rated current at 100%.
J69
Brake-OFF
frequency/speed
0.0 to 25.0 Hz Available only under V/f control.
J70
Brake-OFF timer 0.0 to 5.0 s
J95
Brake-OFF torque 0 to 300% Available only under vector control.
J96
Operation selection
Current response selection
(bit 2)
0: Slow response
1: Quick response
Selects the response time of the
judgment of Brake-OFF current.
When the slow response is selected
(factory default), the detection filter
is inserted to the detected current.
Therefore, the brake-off timing slows
down a little to the rise of actual
current. If this delay cannot be
ignored in an adjustment, select the
quick response.
Turning the Brake ON
When the run command is off and the output frequency drops below the level specified by Brake signal
(Brake-ON frequency) (J71) and stays below the level for the period specified by Brake signal (Brake-ON
timer) (J72), the inverter judges that the motor rotation is below a certain level and turns the signal
BRKS off
for activating the brake.
For the vector control, when the speed command or speed detection value decrease to load frequency
(selected by J96 bit 3) or lower, and the status stays below the level for the period specified by Brake signal
(Brake-ON timer) (J72), the inverter judges that the motor rotation is below a certain level and turns the
signal
BRKS off for activating the brake.
This operation reduces the load applied to the brake, extending service life of the brake.
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