Hitachi SJ2002 Series Instruction Manual page 100

3–20
"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 (A052). The braking power
(A054) and duration (A055) can both be set. You can optionally specify a wait time
before DC braking (A053), 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.
Code SRW Display
A051 DC braking enable
DCB Mode
A052 DC braking frequency
setting
DCB F
A053 DC braking wait time
DCB Wait 0000.0s
A054 DC braking force for
deceleration
DCB V
A055 DC braking time for
deceleration
DCB T
A056 DC braking / edge or
level detection for [DB]
input
DCB KIND
4–26). Also refer to the motor manufacturer's specifications for
"A" Function
Name /
Two options; select codes:
00... Disable
OFF
01... Enable
The frequency at which DC
braking begins
00... DC braking only works
0000.5Hz
with [DB] terminal input.
Range is 0.0 to 60.0 Hz
The delay from the end of
controlled deceleration to start
of DC braking (motor free runs
until DC braking begins),
range is 0.0 to 5.0 sec.
Level of DC braking force,
settable from 0 to 100%
00000%
Sets the duration for DC
braking, range is 0.0 to 60.0
seconds
0000.0s
Two options; select codes:
00... Edge detection
01... Level detection
LEVEL
+
Running
0
–
Run
Mode
Edit
Description
Lo Hi
✘ ✔
✘ ✔
✘ ✔
✘ ✔
✘ ✔
✘ ✔
Free run DC braking
A053 A055
"Thermistor Thermal
Defaults
–FE(F) –FU
Units
(EU) (USA)
00 00 —
0.5 0.5 Hz
0.0 0.0 sec.
0. 0. %
0.0 0.0 sec.
01 01 —
t