Hitachi SJ700-2 instruction manual Brake control function

Related code

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

Chapter 4 Explanation of Functions

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.

Brake Release Frequency	Braking frequency (b127)
Setting (b125)

Output frequency	5)	7)
1)		Brake Wait Time for Stopping (b123)
Operation command	2) Brake Wait Time for Release (b121)

Brake release signal Braking confirmation signal

4)Brake Wait Time for Acceleration (b122)

3)

Brake Wait Time for Confirmation (b124)

6)

Brake Wait Time for Confirmation (b124)

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.

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