5-155
This operation reduces the load applied to the brake, extending lifetime of the brake.
Function
code
Name Data
setting
range
Remarks
J71
Brake-ON frequency/speed 0.0 to 25.0 Hz
J72
Brake-ON timer
0.0 to 5.0 s
J96 Speed
condition
selection
(Braking conditions)
Available when using
vector control with/without
speed sensor.
Criteria of speed condition for brake-ON
(Bit 0)
0: Detected speed
1: Reference speed
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).
Criteria of frequency for brake-ON (Bit 3)
0: Stop frequency (F25)
1: Brake-ON frequency (J71)
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.
Turn-on condition of brake signal (Bit 4)
0: Independent of a run command ON/OFF
1: Only when a run command is OFF
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).
• The brake signal control is only applicable to the 1st motor. If the motor switching function selects any of the
2nd to 4th motors, the brake signal remains ON.
• If the inverter is shut down due to an occurrence of alarm state or by the terminal command
BX
("Coast to a
stop"), the brake signal is immediately turned ON.
• Bit 1 of J96 is reserved (fixed at "0").
Operation time chart under V/f control
Summary of Contents for FRENIC-MEGA
Page 36: ...2 6 Unit inch mm Refer to Section 2 3 3 9...
Page 356: ...MEMO...
