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Chapter 4 Explanation of Functions
4 - 81
4.2.90 Brake control function
The brake control function allows you to make the inverter control
an external brake used for a lift or other machines. To enable this
function, specify "01" (enabling the brake control function) for the
Brake Control Enable (b120). This function operates as described
below.
1) When the inverter receives an operation command, it starts the
output and accelerates the motor up to the Brake Release
Frequency Setting.
2) After the Brake Release Frequency Setting is reached, the inverter waits for the braking wait time
(b121), and then outputs the brake release signal (BRK). However, if the inverter output current has not
reached the brake release current (b126), the inverter does not output the break release signal, but
trips and outputs a braking error signal (BER).
3) When the braking confirmation signal (BOK) has been assigned to an intelligent input terminal (that is,
when "44" is specified for one of "C001" to "C008"), the inverter waits for the Brake Wait Time for
Confirmation (b124) without accelerating the motor after receiving the brake release signal. If the
inverter does not receive the braking confirmation signal within the braking confirmation time (b124), it
trips with the braking error signal (BER) output. When the braking confirmation signal (BOK) has not
been assigned to any intelligent input terminal, the Brake Wait Time for Confirmation (b124) is invalid.
In such cases, the inverter proceeds to the operation described in Item 4) after the output of the brake
release signal.
4) After the input of the braking confirmation signal (or the output of the brake release signal [when the
BOK signal function is disabled], the inverter waits for the Brake Wait Time for Acceleration (b122), and
then starts accelerating the motor up to the set acceleration frequency.
5) When the operation command is turned off, the inverter decelerates the motor down to the braking
frequency (b125), and then turns off the brake release signal (BRK).
6) When the braking confirmation signal (BOK) has been assigned to an intelligent input terminal (that is,
when "44" is specified for one of "C001" to "C008"), the inverter waits, after turning off the brake release
signal, until the braking confirmation is turned off at least for the Brake Wait Time for Confirmation
(b124) without decelerating the motor. If the braking confirmation signal is not turned off within the
Brake Wait Time for Confirmation (b124), the inverter trips with the braking error signal (BER) output.
When the braking confirmation signal (BOK) has not been assigned to any intelligent input terminal, the
Brake Wait Time for Confirmation (b124) is invalid. In such cases, the inverter proceeds to the
operation described in Item 7) after the brake release signal is turned off.
7) After the braking confirmation signal (or the brake release signal [when the BOK signal function is
disabled] is turned off, the inverter waits for the Brake Wait Time for Stopping (b123), and then starts
decelerating the motor down to 0 Hz.
Note: The above timing chart shows the operation on the assumption that the braking confirmation signal
"44" (BOK) is assigned to one of the terminal [1] to [8] functions (C001 to C008). If the BOK signal is
not assigned to any terminal, the Brake Wait Time for Acceleration (b122) begins when the brake
release signal is turned on, and the Brake Wait Time for Stopping (b123) begins when the brake
release signal is turned off.
b120: Brake Control Enable
b121: Brake Wait Time for Release
b122: Brake Wait Time for Acceleration
b123: Brake Wait Time for Stopping
b124: Brake Wait Time for Confirmation
b125: Brake Release Frequency Setting
b126: Brake Release Current Setting
b127: Braking frequency
C001 to C008: Terminal [1] to [8] functions
C021 to C025: Terminal [11] to [15] functions
Related code
2
)
3
)
4
)
6
)
7
)
1
)
5)
Brake Release Frequency
Setting (b125)
Braking frequency (b127)
Output frequency
Operation command
Brake release signal
Braking confirmation signal
Brake Wait Time for Release (b121)
Brake Wait Time for Acceleration (b122)
Brake Wait Time for Stopping (b123)
Brake Wait Time for Confirmation (b124)
Brake Wait Time for Confirmation (b124)