Hitachi L200 Manual Do Utilizador

Using Intelligent Input Terminals

Oper

ations

and Monitor

ing

When the terminal [DB] is turned ON, the 
DC braking feature is enabled. Set the follow-
ing 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.

Output

frequency

[FW, RV]

[DB]

Output

frequency

Run command 

from operator

Output

frequency

[DB]

[DB]

Run command 

(from operator)

1
0
1
0

t

t

t

delay

1
0

1
0

1
0

1
0

A053

07

DB

External DC Braking

ON

applies DC injection braking during deceleration

OFF

does not apply DC injection braking during 
deceleration

C001, C002, C003, C004, 
C005

A053, A054

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.

Example (requires input configuration—see 
page 

):

See I/O specs on page 

.

DB

1

2

3

4

5

L

PCS