Quiet and compact DBRs
Cressall Resistors has introduced its HP series of high performance dynamic braking resistors (DBRs) which are said to be ideal for use on cranes, winches, conveyors and test loads as well as on lifts and elevators.
The compact and ready boxed DBRs are enclosed to IP20 and make virtually no noise when subject to inverter braking currents. Their low inductance open-wound element construction allows high power-dissipation in a small space. When used with an inverter, the units are suitable for use with any make of drive.
The range is divided into HP1, HP2 and HP3 units, which have continuous power ratings of 1.5kW, 3.0kW and 4.5kW respectively. The continuous power ratings can be exceeded when power is applied for less than 100% of the time and the extent to which this can be done is calculated using a simple equation.
The units measure 508mm in length by 140mm high and between 144mm and 239mm wide. They can be provided with an IP21 drip proof canopy if required. A knock out hole for cable entry is provided on each of outward facing sides and on the bottom of the terminal compartment.
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