Hitachi SJ300-037HFE 사용자 설명서
SJ300 Inverter
Oper
ati
ons
ons
and Monitor
ing
4–17
External Signal
for DC Injection
Braking
for DC Injection
Braking
When the terminal [DB] is turned ON, the
DC braking [DB] feature is enabled. Set the
following parameters when the external DC
braking terminal is to be used:
DC braking [DB] feature is enabled. Set the
following parameters when the external DC
braking terminal is to be used:
• A053 – DC braking delay time setting.
The range 0.0 to 5.0 seconds.
• A054 – DC braking force setting. The
range is 0 to 100%.
The scenarios to the right help show how
DC braking works in various situations.
DC braking works in various situations.
1. Scenario 1 – The [FW] Run or [RV]
Run terminal is ON. When the [DB]
terminal turns ON, DC braking is
applied. When the [DB] terminal turns
OFF again, the inverter output ramps to
the previous frequency.
terminal turns ON, DC braking is
applied. When the [DB] terminal turns
OFF again, the inverter output ramps to
the previous frequency.
2. Scenario 2 – The Run command is
applied from the operator keypad. When
the [DB] terminal turns ON, DC braking
is applied. When the [DB] terminal
turns OFF again, the inverter output
remains OFF.
the [DB] terminal turns ON, DC braking
is applied. When the [DB] terminal
turns OFF again, the inverter output
remains OFF.
3. Scenario 3 – The Run command is
applied from the operator keypad. When
the [DB] terminal turns ON, DC braking
is applied after the delay time set by
A053 expires. The motor is in a free-
running (coasting) condition during this
delay time. When the [DB] terminal
turns OFF again, the inverter output
remains OFF.
the [DB] terminal turns ON, DC braking
is applied after the delay time set by
A053 expires. The motor is in a free-
running (coasting) condition during this
delay time. When the [DB] terminal
turns OFF again, the inverter output
remains OFF.
Opt.
Code
Symbol
Function Name
Input
State
Description
07
DB
External Signal for
DC Injection
Braking
DC Injection
Braking
ON
applies DC injection braking during
deceleration
deceleration
OFF
does not apply DC injection braking
during deceleration
during deceleration
Valid for
inputs:
inputs:
C001, C002, C003, C004,
C005, C006, C007, C008
C005, C006, C007, C008
Required
settings:
settings:
A053, A054
Notes:
• Do not use the [DB] input continuously or for
• Do not use the [DB] input continuously or for
a long time when the DC braking force
setting A054 is high (depends on the motor
application).
setting A054 is high (depends on the motor
application).
• Do not use the [DB] feature for continuous or
high duty cycle as a holding brake. The [DB]
input is designed to improve stopping perfor-
mance. Use a mechanical brake for holding a
stop position.
input is designed to improve stopping perfor-
mance. Use a mechanical brake for holding a
stop position.
Output
frequency
[FW, RV]
[DB]
Scenario 1
Output
frequency
Run command
from operator)
Scenario 2
Output
frequency
Scenario 3
[DB]
Run command
from operator)
[DB]
A053
t
t
t
delay
5
3
1
7
6
4
2
8
FW
TH
PLC
CM1
P24
CM1
See I/O specs on page
Example: (Requires input configuration—
see page
see page
. Jumper position shown is
for –xFU/-xFR models; for –xFE models,
see page
see page
DB