External Signal For Dc Braking - Hitachi X200 Series Instruction Manual

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:
A053 – DC braking delay time setting.
The range is 0.1 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.
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 A053 expires.
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
07 DB External DC
Braking
Valid for inputs: C001~C005
Required settings A053, A054
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
performance. Use a mechanical brake for
holding a stop position.
Function Name State
ON
OFF
[FW,RV]
1
0
1
[DB]
0
Output
frequency
Run command
1
from operator
0
1
[DB]
0
Output
frequency
Run command
1
from operator
0
1
[DB]
0
Output
frequency
Description
Applies DC injection braking during deceleration
Does not apply DC injection braking during
deceleration
Example (requires input configuration—see
page 3–49):
DB
5 4 3
See I/O specs on page 4–6.
4 15
4 15
Scenario 1
t
Scenario 2
t
Scenario 3
delay
A053
t
2 1 L PCS P24