NORD Drivesystems MI0700 - Manual (Page 47)

2 Implementation
MI 0700 GB-0414 47
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2.8 Braking resistors
External braking resistors are available as accessory for the SK 700E-xxx-340-A (-RS2) and also the
SK 5xxE-xxx-340-A frequency inverters.
Both frequency inverter series feature integrated brake choppers, to absorb the fed back energy
(resulting from dynamic brake actions) using an external braking resistor.
There are two versions of these external braking resistors that are used to prevent overvoltage-
induced switch-off actions of the frequency inverters.
Version
• Footprint braking resistor
• Chassis braking resistor
Footprint versions SK BR1 / SK BR4 Chassis (type 1) SK BR2 Chassis (type 2) SK BR2
Figure 8: Braking resistor versions
The footprint braking resistors of type SK BR1-xxx/xxx-F for SK 700E frequency inverters are only
available for the power range of 1.5 kW to 7.5 kW. For SK 5xxE frequency inverters, footprint braking
resistors of type SK BR4-xxx/xxx are available for the power range of 1.5 kW to 7.5 kW.
The chassis braking resistors of type SK BR2 –xxx/xxx-C are available for the entire power range
of SK 700E frequency inverters from 1.5 kW to 160.0 kW.
For application with an SK 5xxE frequency inverter, the identical - depending of the resistance -
chassis braking resistors BW SK BR2-xxx-xxx-C can only be used in the power range from 3.0 kW to
160.0 kW. For more details regarding the allocation of the respective braking resistors, refer to the
following sub-chapters.
Information Braking resistors
For more details regarding the resistances, continuous power specifications and dimensions of the braking
resistors, please refer to the respective manuals (BU 0700 and BU 0500 or BU 0505, see
www.nord.com ).
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