Hitachi SJ Series User Manual page 346

Chapter 12
External DC braking via terminal function
A
• Assign 030 [DB] to input terminal functions
[CA-01] to [CA-11].
• When [AF101]=00 or 01, DC braking will be
applied depending on whether the [DB] terminal is
on or off.
• Adjust the braking force by adjusting the [AF105]
DC braking force.
• When you set the [AF104] DC braking delay time,
the inverter output will be shut off within the set
period of delay, and the motor will run freely during
the period. (Ex. 11), (Ex. 14)
• DC braking will be restarted after the set period
has elapsed.
• Select the braking mode by the DC braking/edge
or level selection [AF107], and then make any
other necessary settings suitable for your system.
• When [AF107]=00: After [DB] is turned on, the
inverter performs DC braking for the time set for
[AF106] . (Example 9) to (Example 11)
• When [AF107]=01: The inverter performs DC
braking only when [DB] is on. (Ex. 12) to (Ex. 14)
Edge mode: [AF107]=00
(Ex. 9)
FW
DB
Output frequency
(Ex. 10)
ON
FW
DB
Output frequency
(Ex. 11)
FW ON
DB
Output frequency
ON
ON
DC braking
[AF106]
ON
DC braking
[AF106]
ON
DC braking
Free-running
[AF104] [AF106]
！
• When setting [AF105] DC braking force, [AF106]
DC braking time, or the ON time of the [DB]
terminal (input terminal function 030), pay
attention to the heat generation on the motor.
• The setting for the [DB] terminal is given priority
over operation commands. (Ex. 9), (Ex. 12)
• If the [DB] terminal is turned on when the motor
speed is high, an overcurrent error or an
overvoltage error may occur.
• When the [DB] terminal is turned on, DC braking
mode that occurs when "00" is specified for
[AF102] Braking mode selection is performed
regardless of the setting for [AF102].
Level mode: [AF107]=01
(Ex. 12)
FW
DB
Output frequency
(Ex. 13)
FW
DB
Output frequency
(Ex. 14)
FW
DB
Output frequency
12-15-5
Inverter Function
ON
ON
DC braking
ON
ON
DC braking
ON
ON
Free-running
[AF104]
DC braking