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Product overview

1.2 Product overview

1.2.1 Preface

First we would like to welcome you as a customer of KEB and congratulation to the purchase of this product.

You have decided for a product on highest technical niveau.

Theencloseddocumentsaswellasthespeciedhard-andsoftwarearedevelopmentsofKEB.Errorsexcepted.

The Karl E. Brinkmann GmbH has created these documents, this hard- and software with the best knowledge.

Wedoesn´taccepttheguaranteethattheusergetstheprotwiththisspecications.KEBreservestherightto

changespecicationswithoutpriornoticeortoinformthirdpersons.Thislistisnotexhaustive.

Theusedpictogramshavefollowingsignicance:

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1.2.2 View of power supply and regenerative units

In power transmission different operating conditions occur with the electrical machines. Beside the motor oper-

ation, there is the regenerative operation, where energy is regenerate into the system. An inverter with uncon-

trolledrectierenablesonlyoneenergyowdirection,sousuallytheregenerativeenergyisdissipatedwitha

brake transistor and braking resistor. The overvoltage is limited by this way and thus an error disconnection or

destruction of the inverter is avoided.

The target of the regenerative unit is not to dissipate the regenerative energy into heat, but to regenerate the

usableenergyintothenet.Conditionforthis:inverterswithatleastoneDCvoltageoutput,wheretheDClink

voltage is coupled to the regenerative unit. In this case decoupling diodes are used for determination of the energy

owdirection.TheregenerativeunitisconnectedviacommutationthrottleorharmoniclterandEMC-lterwith

the 3-phase line. Thus a regenerative unit is place-, energy-saving, environmentally friendly and cost reducing.

If several inverters are used in a machine, these can be coupled via DC interconnection with the regenerative

unit, whereby the DC link voltage becomes more stable within the interconnection. This can improve the pro-

cessing of the individual drives. To make the wiring as simple as possible, it is reasonable to supply the inverters

via DC interconnection.

Here the regenerative unit serves simultaneously as supply unit. The inverters must be designed for DC voltage

supply in this case. The COMBIVERT R6-N power supply and regenerative units can be parallel connected for

high power supply and/or regenerative supply.

1.2.3 Function principle

After switching on the DC interconnection is supplied with voltage after correct initialisation phase. If the voltage

in the DC interconnection exceeds an adjustable threshold due to generative operation, the COMBIVERT R6-N

starts to regenerate the energy into the net by square-wave modulation. With the internal input voltage detection,

KEB COMBIVERT R6-N User Manual

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