Dynamic braking resistors are enclosed to IP20
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Cressall Resistors product story
Edited by the Engineeringtalk editorial team
Sep 21, 2009
Cressall Resistors has introduced its HP series of high-performance dynamic braking resistors (DBRs), which is said to be ideal for use on cranes, winches, conveyors and test loads.
The range of compact, ready-boxed DBRs is enclosed to IP20 and makes virtually no noise when subject to inverter braking currents.
Its low-inductance open-wound element construction allows high power-dissipation in a small space.
Cressall Resistors said it is these two factors that make the HP series ideal for use in lifts and elevators where noise and heat dissipation are significant issues.
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 per cent of the time and the extent to which this can be done is calculated using a simple equation.
The resistors are manufactured using high-grade nickel-chrome wire, the resistance values of which change little over the temperature range of the element.
As a result, the units are much more effective than versions produced with other materials, such as lower-grade stainless steels for instance.
The robust units measure 508mm in length by 140mm high and between 144mm and 239mm wide, depending on the model chosen.
The larger models offer higher continuous power ratings.
They can be provided with an IP21 drip-proof canopy if required, although this will increase the height and overhang of the unit.
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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