Hitachi SJ100 Series Instruction Manual page 81

DC Braking Settings
The DC braking feature provides
additional stopping power when compared
to just a normal deceleration to a stop. DC
braking is particularly useful at the low
frequency end of the deceleration ramp
where there is little or no motor torque
available for stopping. If you enable DC
braking, it turns on during deceleration at a
frequency you can specify. If desirable,
you can specify a delay time during which the motor coasts (free runs) before DC
braking helps stop the rotation.
Most importantly, the force and duration of DC braking are adjustable. Be careful to not
specify a long braking time that causes motor overheating. If you use DC braking, we
recommend using a motor with a built-in thermistor, and wiring it to the inverter's
thermistor input (see page 4–19). Also refer to the motor manufacturer's specifications
for duty-cycle recommendations during DC braking.
"A" Function
Func.
Name
Code
A51 DC braking enable
A52 DC braking frequency
setting
A53 DC braking wait time The delay from the end of Run
A54 DC braking force
setting
A55 DC braking time
setting
+
0
Description
Two options; select codes:
00... Disable
01... Enable
The frequency at which DC
braking occurs,
range is 0.5 to 10 Hz
command to start of DC
braking (motor free runs until
DC braking begins)
Applied level of DC braking
force, settable from 0 to 100%
Sets the duration for DC
braking, range is 0.1 to 60.0
seconds
SJ100 Inverter
Running Free run
A53
–
Defaults
Run-
time
EU/
Units
Edit
US
✘
00 —
✘
0.5 Hz
✘
0.0 sec.
✘
0 %
✘
0.0 sec.
3–15
DC braking
time
A55
DOP,DRW,DOP+
Func.
Name
Code
F-20 DCB SW
F-20 DCB F
F-20 DCB
WAIT
F-20 DCB V
F-20 DCB T