Braking resistor range expanded
A
Cressall Resistors product story
Edited by the Engineeringtalk editorial team
Jul 20, 2007
Cressall Resistors has expanded its range of low noise ES braking resistors with the addition of 1.0 and 2.0kW sized models.
Cressall Resistors has expanded its range of low-noise ES braking resistors with the addition of 1.0 and 2.0kW sized models.
These new ratings complement the existing array, which includes 0.6, 1.5, 3.0 and 4.5kW versions with resistance values from 3.9 to 330ohm.
The new 1.0 and 2.0kW sizes are used where there is the need 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.
The robust IP20 rated units produce negligible audible noise.
This is essential for applications where they will be located near the general public, such as in the resonant chamber of a lift.
The units are manufactured using high-grade nickel chrome wire, which means the resistance value changes only negligibly over the temperature range of the element.
"This is a significant factor because a design using lower grade stainless steel could increase in resistance by as much as 50% - resulting in impaired braking" explained Cressall Director Peter Duncan.
A choice of termination method and accessories keeps both purchase and installation cost on the ES series low.
Installation is further simplified by slotted mounting points for M6 fixings.
The terminal cover features two 20mm knock out holes on the end face and overhangs the resistor by 22mm, leaving an open area for cable entry.
Every continuous power rating in the range is available in ES - S and ES - P versions.
The ES - S range allows for connection via screw terminals with an optional thermal trip and/or terminal cover, while the ES - P range has through panel terminals and an optional thermal trip.
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