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CP Automation has enhanced its product offering for the elevation, crane and OCH industries by adding Cressall Resistors’ HP and ES series braking resistors to its portfolio.

First in CP Automation’s range is Cressall Resistors’ HP series of high-performance dynamic braking resistors (DBRs).

The range is ideal for use on cranes, winches, conveyors and test loads as well as on lifts and elevators.

The compact, 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.

It is these factors that make the HP series ideal for use in lifts and elevators where noise and heat dissipation are both 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.

Also available is Cressall Resistors’ range of low-noise ES braking resistors, which has recently been expanded with the addition of 1.0kW- and 2.0kW-sized models.

These ratings complement the existing array, which includes 0.6, 1.5, 3.0 and 4.5kW versions with resistance values from 3.90 ohm to 330 ohm.

The 1.0kW and 2.0kW sizes are used where the need exists to cope with high levels of regenerated energy in a compact space.

This includes motor control on elevators, VSD control and use on conveyors, cranes and winches as well as test loads.

Like the HP series, these robust IP20-rated units produce negligible audible noise.

Both sets of resistors are manufactured using high-grade nickel chrome wire, which means the resistance value changes only negligibly over the temperature range of the element.

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