External Signal For Dc Injection Braking - Hitachi SJ300 Series Instruction Manual

External Signal
When the terminal [DB] is turned ON, the
DC braking [DB] feature is enabled. Set the
for DC Injection
following parameters when the external DC
Braking
braking terminal is to be used:
• A053 – DC braking delay time setting.
• A054 – DC braking force setting. The
The scenarios to the right help show how
DC braking works in various situations.
1. Scenario 1 – The [FW] Run or [RV]
2. Scenario 2 – The Run command is
3. Scenario 3 – The Run command is
The range 0.0 to 5.0 seconds.
range is 0 to 100%.
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.
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.
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.
Opt.
Symbol Function Name
Code
07 DB External Signal for
DC Injection
Braking
C001, C002, C003, C004,
Valid for
C005, C006, C007, C008
inputs:
A053, A054
Required
settings:
Notes:
• 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).
• 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.
SJ300 Inverter
Scenario 1
[FW, RV]
[DB]
Output
frequency
Scenario 2
Run command
from operator)
[DB]
Output
frequency
Scenario 3
Run command
from operator)
[DB]
Output
frequency
Input
Description
State
ON applies DC injection braking during
deceleration
OFF does not apply DC injection braking
during deceleration
Example: (Requires input configuration—
see page 3–47. Jumper position shown is
for –xFU/-xFR models; for –xFE models,
see page 4–12.)
TH FW
8
P24 PLC CM1
7
See I/O specs on page 4–9.
4–17
t
t
delay
A053
t
DB
CM1
5 3 1
6 4 2