ABB BC810K02 CEX-bus Interconnection Unit

Easy engineering

ABB’s Freelance 800F control system combines

easy engineering with an open, modern system

architecture. In detail, this means:

•  Only one tool for engineering, commissioning and diagnosis

•  Field devices completely integrated into

control system engineering

•  Central access to all field information

•  Potential savings in engineering,

commissioning, testing, service and maintenance

•  Assembly close to the field and thus reduction

of field wiring and space requirements

The drive monitors the motor status continuously, also during flux braking.

Therefore, flux braking can be used both for stopping the motor and for changing the

speed. The other benefits of flux braking are:

• The braking starts immediately after a stop command is given. The function does

not need to wait for the flux reduction before it can start the braking.

• The cooling of the induction motor is efficient. The stator current of the motor

increases during flux braking, not the rotor current. The stator cools much more

efficiently than the rotor.

• Flux braking can be used with induction motors and permanent magnet

synchronous motors.

Two braking power levels are available:

• Moderate braking provides faster deceleration compared to a situation where flux

braking is disabled. The flux level of the motor is limited to prevent excessive

heating of the motor.

• Full braking exploits almost all available current to convert the mechanical braking

energy to motor thermal energy. Braking time is shorter compared to moderate

braking. In cyclic use, motor heating may be significant.