Lenze DSD Manual do Utilizador descarregar pdf (Página 375)

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101

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23 375

12 Components in the DC bus

12.6 Brake resistor selection

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[12-6] Inverter diagram: brake resistor utilisation

Description

gen

th,min

) DC power in generator mode on the brake resistor, assuming ideal efficiency of motor, inverter,

and gearbox.

gen

th,max

) DC power in generator mode on the brake resistor, assuming worst efficiency of motor, inverter,

and gearbox.

av,Rb

Average braking power on the brake resistor, considering the thermal time constant (τ

th,Brm

)

N,red

Continuous power of the brake resistor

max

Peak power of the brake resistor

max,Rb

Max. utilisation of the brake resistor

Possible message: The max. utilisation of the equivalent resistance is xxx %. Thus the limit value

of 100 % is exceeded.

th,Rb

Thermal utilisation of the brake resistor

Possible message: The permanent utilisation of the equivalent resistance is xxx %. Thus the limit

value of 100 % is exceeded.

th,Rb

Thermal time constant for checking the brake resistor

Type Brake resistor type

1 2 ... 370 371 372 373 374 375 376 377 378 379 380 ... 495 496

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