SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
4.2.90 Brake control function<br />
The brake control function allows you to make the inverter control<br />
an external brake used for a lift or other machines. To enable this<br />
function, specify "01" (enabling the brake control function) for the<br />
Brake Control Enable (b120). This function operates as described<br />
below.<br />
Related code<br />
b120: Brake Control Enable<br />
b121: Brake Wait Time for Release<br />
b122: Brake Wait Time for Acceleration<br />
b123: Brake Wait Time for Stopping<br />
b124: Brake Wait Time for Confirmation<br />
b125: Brake Release Frequency Setting<br />
b126: Brake Release Current Setting<br />
b127: Braking frequency<br />
C001 to C008: Terminal [1] to [8] functions<br />
C021 to C025: Terminal [11] to [15] functions<br />
1) When the inverter receives an operation command, it starts the<br />
output and accelerates the motor up to the Brake Release<br />
Frequency Setting.<br />
2) After the Brake Release Frequency Setting is reached, the inverter waits for the braking wait time<br />
(b121), and then outputs the brake release signal (BRK). However, if the inverter output current has not<br />
reached the brake release current (b126), the inverter does not output the break release signal, but<br />
trips and outputs a braking error signal (BER).<br />
3) When the braking confirmation signal (BOK) has been assigned to an intelligent input terminal (that is,<br />
when "44" is specified for one of "C001" to "C008"), the inverter waits for the Brake Wait Time for<br />
Confirmation (b124) without accelerating the motor after receiving the brake release signal. If the<br />
inverter does not receive the braking confirmation signal within the braking confirmation time (b124), it<br />
trips with the braking error signal (BER) output. When the braking confirmation signal (BOK) has not<br />
been assigned to any intelligent input terminal, the Brake Wait Time for Confirmation (b124) is invalid.<br />
In such cases, the inverter proceeds to the operation described in Item 4) after the output of the brake<br />
release signal.<br />
4) After the input of the braking confirmation signal (or the output of the brake release signal [when the<br />
BOK signal function is disabled], the inverter waits for the Brake Wait Time for Acceleration (b122), and<br />
then starts accelerating the motor up to the set acceleration frequency.<br />
5) When the operation command is turned off, the inverter decelerates the motor down to the braking<br />
frequency (b125), and then turns off the brake release signal (BRK).<br />
6) When the braking confirmation signal (BOK) has been assigned to an intelligent input terminal (that is,<br />
when "44" is specified for one of "C001" to "C008"), the inverter waits, after turning off the brake release<br />
signal, until the braking confirmation is turned off at least for the Brake Wait Time for Confirmation<br />
(b124) without decelerating the motor. If the braking confirmation signal is not turned off within the<br />
Brake Wait Time for Confirmation (b124), the inverter trips with the braking error signal (BER) output.<br />
When the braking confirmation signal (BOK) has not been assigned to any intelligent input terminal, the<br />
Brake Wait Time for Confirmation (b124) is invalid. In such cases, the inverter proceeds to the<br />
operation described in Item 7) after the brake release signal is turned off.<br />
7) After the braking confirmation signal (or the brake release signal [when the BOK signal function is<br />
disabled] is turned off, the inverter waits for the Brake Wait Time for Stopping (b123), and then starts<br />
decelerating the motor down to 0 Hz.<br />
Brake Release Frequency<br />
Setting (b125)<br />
Braking frequency (b127)<br />
Output frequency<br />
Operation command<br />
1) 5)<br />
2)<br />
Brake Wait Time for Release (b121)<br />
7)<br />
Brake Wait Time for Stopping (b123)<br />
Brake release signal<br />
Braking confirmation signal<br />
4) Brake Wait Time for Acceleration (b122)<br />
3)<br />
Brake Wait Time for Confirmation (b124)<br />
6)<br />
Brake Wait Time for Confirmation (b124)<br />
Note: The above timing chart shows the operation on the assumption that the braking confirmation signal<br />
"44" (BOK) is assigned to one of the terminal [1] to [8] functions (C001 to C008). If the BOK signal is<br />
not assigned to any terminal, the Brake Wait Time for Acceleration (b122) begins when the brake<br />
release signal is turned on, and the Brake Wait Time for Stopping (b123) begins when the brake<br />
release signal is turned off.<br />
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