4–17

SJ300 Inverter

External Signal 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:

•A053 – DC braking delay time setting. The range 0.0 to 5.0 seconds.

[FW, RV]

[DB]

Scenario 1

•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] 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.

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.

3.

Scenario 3 – The Run command is

 

applied from the operator keypad. When

Output

frequency

t

Scenario 2

Run command from operator)

[DB]

Output

frequency

t

Scenario 3

Run command from operator)

the [DB] terminal turns ON, DC braking

is applied after the delay time set by

A053 expires. The motor is in a free-

[DB]

Output

delay A053

and

running (coasting) condition during this

delay time. When the [DB] terminal

turns OFF again, the inverter output

remains OFF.

frequency

t

Operations Monitoring

Opt.

Symbol

Function Name

Input

 

 

 

 

 

Description

 

 

 

 

 

 

 

Code

State

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

07

DB

External Signal for

ON

applies DC injection braking during

 

 

DC Injection

 

deceleration

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Braking

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

does not apply DC injection braking

 

 

 

 

 

 

 

during deceleration

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Valid for

C001, C002, C003, C004,

Example: (Requires input configuration—

inputs:

 

C005, C006, C007, C008

see page 3–47. Jumper position shown is

 

 

 

 

for –xFU/-xFR models; for –xFE models,

Required

A053, A054

 

see page 4–12.)

 

 

 

 

 

 

 

 

 

 

 

 

settings:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DB

 

 

 

 

 

 

 

Notes:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TH

FW

8

 

CM1

5

 

3

 

1

 

• Do not use the [DB] input continuously or for

 

 

 

 

 

 

 

P24

PLC

CM1

 

7

6

 

4

 

2

 

 

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 See I/O specs on page 4–9.stop position.