External Signal For Dc Braking - Hitachi WJ200 Series Instruction Manual

4−20

External Signal for DC Braking

When the terminal [DB] is turned ON, the
DC braking feature is enabled. Set the
following parameters when the external DC
braking terminal [DB] is to be used:
• – DC braking delay time setting.
A053
The range is 0.1 to 5.0 seconds.
• – DC braking force setting. The
A054
range is 0 to 100%.
The scenarios to the right help show how DC
braking works in various situations.
1. Scenario 1 – The [FW] or [RV] terminal is
ON. When [DB] is ON, DC braking is
applied. When [DB] is OFF again, the
output frequency ramps to the prior level.
2. Scenario 2 – The Run command is applied
from the operator keypad. When the [DB]
terminal is ON, DC braking is applied.
When the [DB] terminal is OFF again, the
inverter output remains OFF.
3. Scenario 3 – The Run command is applied
from the operator keypad. When the [DB]
terminal is ON, DC braking is applied
after the delay time set by
The motor is in a free-running (coasting)
condition. When the [DB] terminal is OFF
again, the inverter output remains OFF.
Option Terminal
Code Symbol
DB
07
Valid for inputs:
Required settings
Notes:
• Do not use the [DB] input continuously or for a
long time when the DC braking force setting
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 performance. Use a
mechanical brake for holding a stop position.
A053
Function Name State
External DC
Braking
OFF
C001~C007
A053, A054
A054
[FW,RV]
[DB]
Output
frequency
Run command
from operator
[DB]
Output
frequency
Run command
from operator
[DB]
Output
expires.
frequency
ON Applies DC injection braking during deceleration
Does not apply DC injection braking during
deceleration
Example (requires input configuration—see
page 3–84):
7 6 5
See I/O specs on
Scenario 1
1
0
1
0
Scenario 2
1
0
1
0
Scenario 3
1
0
1
0
delay
Description
DB
4 3 2 1 L PCS PLC
page 4–6.
t
t
A053
t
P24