Hitachi WJ Series User Manual page 225

Chapter 9
Brake control function operating sequence
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 The brake control function operating sequence is indicated in the figure below. The following
section explains the brake control function in detail using the figure below. (In the figure below,
"Answer back from brake [BOK] (44)" has been assigned to the input terminal.)
Brake release frequency [b125]
Output
frequency
RUN
command
Brake release
[BRK] output
Answer back from brake
[BOK] input
(1) When the RUN command is given, the inverter accelerates to the "Brake release frequency
[b125]".
(2) After the output frequency reaches the "Brake release frequency [b125]" and also after the
"Brake release wait time [b121]" has elapsed, "Brake release [BRK] (19)" is turned on.
However, if the output current at this time is less than "Brake release current [b126]", [BRK] is
not turned on, and instead, the "Brake error [E36]" trip occurs and "Brake error [BER] (20)" is
turned on.
(3) Operation differs depending on whether or not " Answer back from brake [BOK] (44)" is
assigned to the input terminal.
With [BOK] assignment:
After [BRK] is turned on, the inverter waits for [BOK] to be turned on during the " Brake
confirmation signal wait time [b124]" without accelerating. If [BOK] is not turned on within
the wait time, the "Brake error [E36]" trip occurs and "Brake error [BER]" is turned on.
Without [BOK] assignment:
After [BRK] is turned on, move to step (4).
(4) After the [BOK] input is turned on (or after the [BRK] output is turned on), when "Brake wait
time for accel. [b122]" has elapsed, it accelerates to the set frequency again.
(5) If the RUN command is turned off, the inverter will decelerate to the "Braking frequency
[b127]" and [BRK] will turn off.
(6) Operation differs depending on whether or not "Brake confirmation [BOK] (44)" is assigned to
the input terminal.
With [BOK] assignment:
After [BRK] is turned off, the inverter waits for [BOK] to be turned off during "Brake
confirmation signal wait time [b124]" without decelerating. If [BOK] is not turned off within
the wait time, the "Brake error [E36]" trip occurs and "Brake error [BER]" is turned on.
Without [BOK] assignment:
After [BRK] is turned off, move to step (7).
(7) After the [BOK] input is turned off (or after the [BRK] output is turned off), when "Brake wait
time for stopping [b123]" has elapsed, it decelerates to 0 Hz again.
(1)
(2)
Brake release wait time
[b121]
(4)
Brake wait time for accel.
[b122]
(3)
Brake confirmation signal wait time [b124]
9-7-17
Inverter Functions
Braking frequency [b127]
(7)
(5)
Brake wait time for stopping
[b123]
(6)