L100 Inverter

3–15

DC Braking Settings

The DC braking feature can provide

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

additional stopping torque when

Running

 

 

Free run

 

 

DC braking

 

 

 

 

 

 

 

 

 

 

 

 

 

 

compared to a normal deceleration to a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

stop. DC braking is particularly useful

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

at low speeds when normal decelera-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tion torque is minimal. When you

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

enable DC braking, the inverter injects

 

 

 

 

A 53

 

 

 

 

A 55

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a DC voltage into the motor windings

during deceleration below a frequency you can specify (A_52). The braking power (A_54) and duration (A_55) can both be set. You can optionally specify a wait time before DC braking (A_53), during which the motor will free run (coast).

CAUTION: Be careful to avoid specifying a braking time that is long enough to cause motor overheating. If you use DC braking, we recommend using a motor with a built-in thermistor, and wiring it to the inverter’s thermistor input (see “Thermistor Thermal Protection” on page 4–20). Also refer to the motor manufacturer’s specifications for duty-cycle recommendations during DC braking.

 

 

“A” Function

Run

 

Defaults

 

 

ParametersDrive

 

 

 

 

 

 

 

 

 

 

 

Func.

Name /

Description

Mode

–FE

–FU

–FR

Units

 

Configuring

Edit

 

Code

SRW Display

(CE)

(UL)

(Jpn)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A_51

DC braking enable

Two options; select codes:

00

00

00

 

 

 

 

 

 

00 ...Disable

 

 

 

 

 

 

 

 

 

DCB SW

OFF

 

 

 

 

 

 

 

 

 

01 ...Enable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A_52

DC braking frequency

The frequency at which DC

0.5

0.5

0.5

Hz

 

 

 

 

setting

 

braking occurs,

 

 

 

 

 

 

 

 

 

 

 

range is 0.5 to 10 Hz

 

 

 

 

 

 

 

 

 

DCB F

00.5Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A_53

DC braking wait time

The delay from the end of Run

0.0

0.0

0.0

sec.

 

 

 

 

 

 

command to start of DC

 

 

 

 

 

 

 

 

 

DCB WAIT

0.0s

 

 

 

 

 

 

 

 

 

braking (motor free runs until

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC braking begins)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A_54

DC braking during

Applied level of DC braking

0

0

0

%

 

 

 

 

deceleration

 

force, settable from 0 to 100%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DCB V

000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A_55

DC braking time for

Sets the duration for DC

0.0

0.0

0.0

sec.

 

 

 

 

deceleration

 

braking, range is 0.1 to 60.0

 

 

 

 

 

 

 

 

 

 

 

seconds

 

 

 

 

 

 

 

 

 

DCB T

00.0s