Brake Control Function Related - Hitachi WJ200 Series Instruction Manual

Brake Control Function Related

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 (BOK). However,
if the inverter output current has not reached the brake release current (b126), the
inverter does not output the brake release signal, but trips and outputs a brake
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 "C007"), 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).
Output freq.
Brake release freq.
(b125)
Operation command
Brake release signal
Brake confirmation
signal
(4)
(1)
(2)
(3)
(1) Time to reach Brake release freq.
(2) Brake Wait Time for Release (b121)
(3) Brake Wait Time for Confirmation (b124)
(4) Brake Wait Time for Acceleration (b122)
(5) Time to decelerate down to Braking freq
(6) Brake Wait Time for Confirmation (b124)
(7) Brake Wait Time for Stopping (b123)
Braking freq.
(b127)
(5)
ON
ON
(6)
3−75
(7)