BENSHAW ENHANCED KEYPAD Manual de usuario descargar pdf (Pagina 48)

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Standard Low Voltage Drive Options

Dynamic Brake Resistors and Brake Modules

Dynamic brake resistors and modules are used to address over

voltage conditions with drives. Over voltage trips occur when the DC

bus in the drive increases to the over voltage trip level. This increase in

voltage occurs when the mechanical energy in the motor is converted

into regenerative electrical energy, which is transferred back into the

drive (the motor acts like a generator).

Regeneration occurs when:

• Thedecelerationtimeistooquick.

• Theloadhashighinertiaandkeepsrotatingafterthedriveoutput

power has decreased below that of the load.

(Ex: ﬂy wheels, large fans)

• Theloadisanoverhaulingload,cyclicalorperiodic.

(Ex: pump jack, punch press)

• Whenthemotorsuddenlybecomesunloaded.

(Ex: lumber mill saw applications)

Regeneration can occur on an occasional basis or periodically

(cyclical) depending on the type of load. A dynamic brake module

and resistor are required to be added to the drive to dissipate this

excess power. The module and resistor must be sized correctly

depending on the application.

Contact Benshaw for assistance with sizing brake resistors

and brake modules.

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BENSHAW ENHANCED KEYPAD Manual de usuario Pagina 48