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Under vector control, when the reference speed or the detected one drops below the level of the brake-ON frequency
(specified by bit 3 of J96) and stays below the level for the period specified by J72 (Brake signal (Brake-ON timer)), 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 lifetime of the brake.
Function
Name
code
J71
Brake-ON frequency/speed 0.0 to 25.0 Hz
J72
Brake-ON timer
J96
Speed condition selection
(Braking conditions)
• Operation time chart when Criteria of frequency for brake-ON (Bit 3) = 1 (Brake-ON frequency)
Data setting range
0.0 to 5.0 s
Criteria of speed condition for brake-ON
(Bit 0)
0: Detected speed
1: Reference speed
Criteria of frequency for brake-ON
(Bit 3)
0: Stop frequency (F25)
1: Brake-ON frequency (J71)
Turn-on condition of brake signal (Bit 4)
0: Independent of a run command
ON/OFF
1: Only when a run command is OFF
10
Remarks
(Available only under vector control.)
Specifies the criteria of speed to be used
for brake-ON condition.
When "Vector control without speed
sensor" is selected, specify "Reference
speed" (Bit 0 = 1).
(Available only under vector control.)
Specifies the criteria of frequency to be
used for brake-ON timing.
If "Detected speed" and "Stop frequency"
are selected (Bit 0 = 0 and Bit 3 = 0) to
determine brake-ON timing, the brake
may be applied after running at the stop
frequency (F25) due to a speed error.
If it is required that brake is applied
during running at the stop frequency,
select "Brake-ON frequency" (Bit 3 = 1)
as criteria of frequency.
When jogging or inching the motor for
vertical conveyance, use J71 as
brake-ON frequency.
(Available only under vector control.)
Specifies whether to turn on a brake
signal independent of a run command
ON/OFF or only when a run command is
OFF.
When normal and reverse operations are
switched, brake-ON conditions may be
met in the vicinity of zero speed. For
such a case, select "Only when a run
command is OFF" (Bit 4 = 1).
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