Hitachi SJ300-EL Series Instruction Manual Supplement page 39

acclerelation(b122) can be 0s.
・ The motor must be energized before release of the brake. The sum of brake wait time for release
(b121) and brake wait time for acceleration (b122) should be the time for motor to be energized.
・ Motor response is stabilized within delay time (b128) after frequency of brake off (b127).
・ Brake wait time for stop (b123) provides a time lag for the brake to actually close. This value should
be set longer than the actual time it takes for brake to close. Consequently, for the case (b) using
brake confirmation signal (BOK), this value can be set to 0s.
・ The lower the motor rotational speed is, the less shock occurs when brake is released or closed. In
order to make speed as slow as possibe, carefully observe the motor shaft and tune the following
parameters: Operation frequency, brake release frequency (b125), brake wait time for release
(b121), brake OFF frequency (b127), waiting time for stop (b123) and speed gains.
Brake should be released using the overload advance warning signal [OL], which is detected
internally by monitoring motor current. Time lag to brake release is adjusted with external logic. For
the brake off signal, either use Zero speed detection or a time lag from the stop command.
Every brake has a time lag to release or close. Therefore this time lag must be taken into account
using the parameters of the inverter and external logic. If this can not be accomplished, the best ride
quality may not be achieved.
Output Frequency
(Hz)
Running command (FW/RV)
Multi-speed (CF1)
Overload notice (OL)
Zero speed (ZS)
Brake operation
Time lag to
brake release
Overload
advanced
notice
(C041)
Chapter 4
Zero
speed
detection
(C063)
39
–
Adjustment
Time lag to
brake release
Time(t)