Hitachi SJ100 Instruction Manual page 88

3–16
"A" Group: Standard Functions
DC Braking Settings
The DC braking feature can provide
additional stopping torque when
compared to a normal deceleration to a
stop. DC braking is particularly useful
at low speeds when normal decelera-
tion torque is minimal. When you
enable DC braking, the inverter injects
a DC voltage into the motor windings
during deceleration below a frequency you can specify (A_52). The braking power
(A_54) and duration (A_55) can both be set. You can optionally specify a wait time
before DC braking (A_53), during which the motor will free run (coast).
CAUTION: Be careful to avoid specifying a braking time that is long enough to cause
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
Protection" on page
duty-cycle recommendations during DC braking.
Func. Name /
Code SRW Display
A_51 DC braking enable
DCB SW
A_52 DC braking frequency
setting
DCB F
A_53 DC braking wait time
DCB WAIT
A_54 DC braking during
deceleration
DCB V
A_55 DC braking time for
deceleration
DCB T
4–22). Also refer to the motor manufacturer's specifications for
"A" Function
Description
Two options; select codes:
00... Disable
OFF
01... Enable
The frequency at which DC
braking occurs,
range is 0.5 to 10 Hz
00.5Hz
The delay from the end of Run
command to start of DC
0.0s
braking (motor free runs until
DC braking begins)
Applied level of DC braking
force, settable from 0 to 100%
000
Sets the duration for DC
braking, range is 0.1 to 60.0
seconds
00.0s
+
Running Free run
0
A 53
–
"Thermistor Thermal
Run
Mode
–FE
Edit
(CE)
✘
00
✘
0.5
✘
0.0
✘
0
✘
0.0
DC braking
t
A 55
Defaults
–FU –FR
Units
(UL) (Jpn)
00 00 —
0.5 0.5 Hz
0.0 0.0 sec.
0 0 %
0.0 0.0 sec.