Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario descargar pdf (Pagina 106)

Fuses and Circuit Breakers

106 Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013

Since the motor is “picked up “smoothly at its rotating speed and ramped to the

proper speed, little or no mechanical stress is present.

Configuration

Flying Start is activated by setting the [Flying Start En] parameter to “Enable”

The gain can be adjusted to increase responsiveness. Increasing the value in

[Flying StartGain] increases the responsiveness of the Flaying Start Feature

Application Example

In some applications, such as large fans, wind or drafts may rotate the fan in the

reverse direction when the drive is stopped. If the drive were started in the normal

manner, its output would begin at zero Hz, acting as a brake to bring the reverse

rotating fan to a stop and then accelerating it in the correct direction.

This operation can be very hard on the mechanics of the system including fans,

belts and other coupling devices.

Cooling Tower Fans

Draft/wind blows idle fans in reverse direction. Restart at zero damages fans,

breaks belts. Flying start alleviates the problem

Fuses and Circuit Breakers Refer to the Powerflex 70 Technical Data (publication 20A-TD001) or

PowerFlex 700 Technical Data (publication 20B-TD001

) for fuse information.

169 [Flying Start En]

Enables/disables the function which

reconnects to a spinning motor at actual

RPM when a start command is issued.

Default:

Options:

“Disabled”

“Enabled”

170

Restart Modes

170 [Flying StartGain]

Sets the response of the flying start

function.

Default:

Min/Max:

Display:

4000

20/32767

169

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Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario Pagina 106