Hitachi WJ200 Series

3−27
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 “Thermistor Thermal
Protection” in chapter 4). Also refer to the motor manufacturer’s specifications for
duty-cycle recommendations during DC braking.
DC braking performance at start can also be set separately (a057 and a058).
And carrier frequency of DC braking performance can also be set separately (a059).
CAUTION: Be careful to avoid specifying a braking carrier frequency that is high
enough to cause inverter and 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 “Thermistor Thermal Protection” in chapter 4). Also refer to the motor
manufacturer’s specifications for duty-cycle recommendations during DC braking.
“A” Function
Run
Mode
Edit
Defaults
Func.
Code
Name Description Lnitial data Units
A051
DC braking enable Three options; select codes:
00…Disable
01…Enable during stop
02…Frequency detection
The frequency at which DC
braking begins,
range is from the start
frequency (B082) to 60Hz
U
00
−
A052
DC braking frequency
U
0.5 Hz
A053
DC braking wait time 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%
U
0.0 sec.
A054
DC braking force for
deceleration
U
50. %
A055
DC braking time for
deceleration
Sets the duration for DC
braking, range is from 0.0 to
60.0 seconds
U
0.5 sec.
A056
DC braking / edge or level
detection for [DB] input
Two options; select codes:
00…Edge detection
01…Level detection
U
01
−
a057
DC braking force at start Level of DC braking force at
start, settable from 0 to 100%
U
0. %
a058
DC braking time at start Sets the duration for DC
braking, range is from 0.0 to
60.0 seconds
U
0.0 sec.
a059
Carrier frequency during DC
braking
Carrier frequency of DC
braking performance, range is
from 2.0 to 15.0kHz
U
5.0 sec.