Braking resistors are required in fields of application where the peak loads of an electromechanical process must be converted into heat. In some cases brake resistors drain energy from a motor drive to stop the motor. The available types range from wire-wound resistors and steel grid resistors to compact resistor elements.
BRAKE RESISTORS IN COILED SHAPE
Wire-wound resistors depending on their application consist of a wire-winding of copper nickel CuNi44 fitted on a ceramic tube or on a frame equipped with porcelain slides. The housing is manufactured from galvanised sheet metal. Connecting cables, terminal boxes or adjustable clips are optionally available. The modular structure allows the combination of multiple resistors to a system.
Applications: frequency converter drives of small to medium power, position: directly at the frequency converter.
BRAKE RESISTORS IN STEEL-GRID VERSION
Steel-grid resistors consist of steel sheet elements with die-cuts in meander shape. For mechanical strength the longitudinal sides of the grids are reinforced. Therefore the elements can be assembled into blocks via insulated threaded bolts. This design achieves particular good heat dissipation due to the large surface and is therefore suitable for high continuous performance. Additionally, due to the vast amount of resistor packages, very high pulse loads are possible.
Applications: frequency converter drives of medium up to high power, position: in direct vicinity or detached from the frequency converter.
COMPACT BRAKE RESISTORS
The resistance elements consist of wire-wound resistors with welded contacts coiled onto Micanite-supports, which are fitted into anodised aluminium casings embedded in quartz sand and insulated with mica. The entire design demonstrates high stability during thermal shock stress. The resistors meet the electrical and thermal requirements of the protection class IP54. A special design allows the maximum protection class IP65.
Applications: frequency converter drives of small up to medium power, Position: directly at the frequency converter.