BONFIGLIOLI Active Cube Wartungshandbuch PDF herunterladen (Seite 86)

Braking resistors

When speed of an inverter-controlled ac motor is reduced, the motor acts as a generator,

feeding back energy to the frequency inverter. As a result, voltage in the intermediate circuit

of the inverter increases. When a speciﬁc threshold is exceeded, the energy must ﬂow to an

external braking system in order to avoid drive failures. Braking resistors are designed to

absorb such energy and to dissipate it into heating. The use of brake resistors allows drives

to fulﬁl the requirements of particularly severe duty cycles, for example those featured by

frequent braking, long lasting braking or impulsive braking.

Bonﬁglioli Vectron offers a wide range of safe and compact braking resistors with IP20

degree of protection: “BR series”.

BR series are designed for panel mounting.

Mostly, they are equipped with built-in thermal protection.

BR models have been thoroughly tested with Bonﬁglioli frequency inverters, therefore they

can be used together with all Active, Synplus, and VCB models.

Connection terminals

The R

and R

braking resistor terminals on Active Cube frequency inverters are located on

the X2 power output terminal strip. Access to these terminals on size 1 and 2 units is made

even easier by the use of disconnectable power terminal strips. Refer to the manual provided

with your frequency inverter for further details on materials and connection methods.

Motor

Bch

+ Ug

- Ug

Connection diagram

= external braking resistor

Bch = brake chopper integrated in

standard Active Cube inverter

X2 terminal strip

V W

T1 T2

X2 terminal strip

U V W R

T1 T2

Frequency inverter

(from 0.25 to 4.0 kW)

Frequency inverter

(from 5.5 to 132 kW)

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BONFIGLIOLI Active Cube Wartungshandbuch Seite 86