NORDAC PRO – Migration guideline SK 5xxE to SK 5xxP
38 MI 0500 en-2922
2.9 Accessories
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2.9.1 Braking resistors
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External braking resistors are available as accessory components for the NORDAC PRO series.
Both NORDAC PRO frequency inverter types are implemented with an integrated brake chopper for
dissipating the energy feedback (generated during dynamic braking) using an external braking
resistor.
For these external braking resistors used for preventing overvoltage-related frequency inverter
shutdowns, a differentiation is made between two different types and designs.
Design
• Chassis braking resistor
• Footprint braking resistor
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2.9.1.1 Chassis braking resistors
In the table below, the different SK BR2-… chassis braking resistors are assigned to the individual
power ranges. The chassis braking resistor types/designs are identical for both device series.
The chassis braking resistors are subdivided into types and different designs. The chassis braking
resistors or the resistor elements are integrated into housing cages and can be used almost
universally. For thermal protection of the chassis braking resistor, these are equipped with an
integrated thermostat (bimetallic switch as opener).
Vertical design Horizontal design
Illustration 7: Versions of chassis braking resistors
The temperature contact can be connected via two terminals (4 mm²) with one digital input of the
frequency inverter and parameterised to, for example, one of the safety functions (“Disable voltage” or
“Quick Stop”).
The chassis braking resistors are UL certified and can also be installed outside the control cabinet due
to their IP20 protection class version and for better heat dissipation. The chassis braking resistors
must be connected to the frequency inverter via a separate connection cable – a shielded cable is
recommended. The connection cable should be as short as possible.
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