Dc Braking Settings - Hitachi SJ200 Series Instruction Manual

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. Name /
Code SRW Display
A051 DC braking enable
DCB Mode
A052 DC braking frequency
setting
DCB F 0000.5Hz
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 0000.0s
A056 DC braking / edge or
level detection for [DB]
input
DCB KIND
4–25). 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 begins,
range is from the start
frequency (B082) to 60 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
Two options; select codes:
00... Edge detection
01... Level detection
LEVEL
SJ200 Inverter
+
Running Free run
0
A053
–
"Thermistor Thermal
Run
Mode
–FEF
Edit
(EU)
0.5
0.0
0.0
3–19
DC braking
t
A055
Defaults
–FU
Units
(USA)
00 00 —
0.5 Hz
0.0 sec.
0. 0. %
0.0 sec.
01 01 —