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Chapter 4 Explanation of Functions
4 - 82
When using the brake control function, assign the following signal functions to intelligent input and
intelligent output terminals as needed.
(1) To input a signal indicating that the brake is released from the external brake to the inverter, assign the
braking confirmation signal (44: BOK) to one of the terminal [1] to [8] functions (C001 to C008).
(2) Assign the brake release signal (19: BRK), which is a brake-releasing command, to one of the
intelligent output terminals [11] to [15] (C021 to C025). To output a signal when braking is abnormal,
assign the brake error signal (20: BER) to an intelligent output terminal.
When using the brake control function, you are recommended to select the sensorless vector control
(A044 = 03) 0Hz-range sensorless vector control (A044 = 04) or V2 (A044=05)as the V/F characteristic
curve selection that ensures a high starting torque. (See Section 4.2.18.)
Settings required for the brake control function
Item Function code Data or range of data Description
00 Disabling the brake control function
Brake Control Enable b120
01 Enabling the brake control function
Brake Wait Time for
Release
b121 0.00 to 5.00 (s)
Time to wait after the output frequency
has reached the release frequency until
the output current reaches the release
current
Brake Wait Time for
Acceleration
b122 0.00 to 5.00 (s)
Mechanical delay after the release
signal has been output until the brake is
released
Brake Wait Time for
Stopping
b123 0.00 to 5.00 (s)
Mechanical delay after the release
signal has been turned off until the brake
is applied
Brake Wait Time for
Confirmation
b124 0.00 to 5.00 (s)
Wait time longer than the delay after the
release signal output until the release
completion signal output from the brake
is input to the inverter
Brake Release Frequency
Setting
b125
0.00 to 99.99 or 100.0 to
400.0 (Hz)
Frequency at which to output the brake
release signal (*1)
Brake Release Current
Setting
b126
"0 x rated current" to
"2.0x rated current" (%)
Frequency at which to permit brake
releasing (*2)
Braking frequency b127
0.00 to 99.99 or 100.0 to
400.0 (Hz)
Frequency at which to apply the brake
for stopping the motor (*1)
*1 Specify a frequency higher than the start frequency (b082).
*2 Note that setting a low current may not ensure sufficient torque at brake releasing.
The inverter will trip with the braking error signal (BER) (E36: brake error) output in one of the following
cases:
1) The inverter output current brake remains below the brake release current, even after the release wait
time (b121).
2) During acceleration, the braking confirmation signal (BOK) is not turned on within the braking wait time
(b124). During deceleration, the braking confirmation signal (BOK) is not turned off within the braking
wait time (b124). Otherwise, the braking confirmation signal is turned off although the brake release
signal is output.