The above operation chart applies to a case where 44: BOK (Brake confirmation signal) is
allocated to one of the Multi-function Input S1 to S8 Selection (C001 to C008). If BOK is not
selected, the Acceleration Wait Time on Brake Control (b122) starts when the brake release
signal turns ON and the Stop Wait Time on Brake Control (b123) starts when the brake release
signal turns OFF.
• To use the brake control function, allocate the following functions to multi-function I/O terminals,
as required.
• When using the brake control function, it is recommended to use sensorless vector control (A044
= 03), 0-Hz sensorless vector control (A044 = 04), or Sensor vector control (A044 = 05), which
generates a high torque during startup.
(1) To input a brake release signal from an external brake to the inverter, allocate one of the
Multi-function Input S1 to S8 Selection (C001 to C008) to 44: BOK (Brake confirmation
signal).
(2) To release a brake, allocate one of the multi-function output terminals P1 to P5 (C021 to
C025) to 19: BRK (Brake release signal). Also, to use a brake error output signal, allocate
one of them to 20: BER (Brake error).
Parameter
No.
Function name Data Default data Unit
b120
Brake Control Function
Selection
00: Disabled
01: Enabled
00 –
b121
Brake Release Wait
Time
0.00 to 5.00:
Set the time required for the output current to
reach the brake release current after
reaching the brake release frequency.
0.00 s
b122
Acceleration Wait Time
on Brake Control
0.00 to 5.00:
Set the mechanical delay time from when the
brake release signal is output until the brake
is released.
0.00 s
b123
Stop Wait Time on
Brake Control
0.00 to 5.00:
Set the mechanical delay time from when the
brake release signal turns OFF until the
brake is applied.
0.00 s
b124
Brake Error Detection
Time
0.00 to 5.00:
Set this to longer than the time from when
the release signal is output until the release
completion signal output by the brake is input
to the inverter.
0.00 s
b125
Brake Release
Frequency
0.00 to 99.99/100.0 to 400.0 [Hz]: Set the
frequency at which the brake release signal
is output.
*1
*1. Set this to a value larger than the Starting Frequency (b082).
0.00 Hz
b126 Brake Release Current
0.0 to 2.00 x Rated current (0.4 to 55 kW)
*2
0.0 to 1.80 x Rated current (75 to 132 kW)
*2
*2. If the set value is too low, the inverter may not output a sufficient torque when the brake is released.
Rated current
value
–
b127 Break Force Frequency
0.00 to 99.99/100.0 to 400.0:
Set the frequency at which the brake is
closed during stop.
*1
0.00 Hz
Related functions C001 to C008, C021 to C025
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