resistor

Rough seas: Resistors for severe environments

February 9, 2017 by Sam Francis

Resistor liquid cooling boosts 3.3kV medium voltage loads, and slashes resistor footprint in industrial and marine applications, as David Atkins, projects director at Cressall Resistors explains

In motor driven applications like cranes, lifts, hoists and conveyors, air cooled resistors are common, but in medium voltage, high power applications liquid cooling wins out.

A medium voltage drive running off a 3.3kV supply to turn a 500kW motor will put a severe heating load on the application’s power transistors – hence the need for water cooling.

The new EV2 advanced water cooled modular resistor range for low and medium voltage applications is especially designed to function in severe environments, like the ones marine systems have to function in.

This patented design encapsulates and completely separates the resistor elements from the coolant. [Read more…] about Rough seas: Resistors for severe environments

Braking resistors that will not break

February 1, 2017 by Sam Francis

David Atkins, projects director at Cressall Resistors, explains why design is essential not only in art, but also in industry, especially when designing equipment such as power resistors for demanding environments like oil and gas

One of the most popular works of Renaissance sculpture is Michelangelo’s David, a piece that has become synonymous with human strength and beauty.

Despite its seemingly perfect proportions, a basic design flaw of the statue has recently been brought to light.

Recurring micro-fractures in the ankles might cause the statue to collapse under its own weight. [Read more…] about Braking resistors that will not break

Manufacturing: Benefits of universal peripherals

January 3, 2017 by Abdul Montaqim

Benefits of using peripherals — Even drives with onboard brake choppers are not rated sufficiently for the braking demand of the application

John Mitchell, global business development manager of maintenance and repair specialist CP Automation, discusses the benefits of using a universal brake chopper that works with any inverter

There is a real danger in the specification of inverters for use in heavy-duty applications. Fresh from the manufacturer, most drives – even ones with onboard brake choppers – are not rated sufficiently for the braking demand of the application.

Non-specialist engineers face an extremely complex task when asked to choose the correct inverter, resistor and brake-chopper combination for a project.

To help counteract this problem, CP Automation recommends using an external brake chopper unit that simplifies the process of inverter selection. Where an inverter doesn’t feature a built-in brake chopper, the new CP Automation unit, manufactured to the highest standards, supplies that functionality. It’s a universal model that works with any inverter, from any manufacturer. [Read more…] about Manufacturing: Benefits of universal peripherals