Electrical Power & Protection


Meeting the needs of the mining industry

April 2020 Electrical Power & Protection

Both above and below ground, Varispeed keeps the interests of its customers top of mind, all the time. The company was recently approached by a platinum mine in South Africa to assist with a robust application.

Three induction motors were required to run a conveyor belt at the mine. These motors had to pull and share the load simultaneously, and this was achieved through the drooping control method. Jonathan Molepo, projects and services engineer for Varispeed says that this is done by limiting inrush currents to the motors, controlling the speed and protecting the motors from various faults that may occur during the process. In addition, the solution was required to operate 1500 metres underground, in a harsh and hot environment. In terms of location, the motors were a long walk away, so they needed to be as self-sufficient as possible. The solution needed to be as user-friendly as possible to ensure quick and easy setup, reliable operation and drastically reduced belt stoppages.

“We looked to a 3-phase VSD motor that could drive the load. These motors were then mechanically coupled to a gear box for high torque and speed reduction, and we installed 12 complete VSD panels.” says Varispeed managing director, Ralph Real. Molepo adds that there was a careful balance between time to completion and the high quality required for this project. “The customer was pressed for time, so we needed to ensure a quick delivery whilst not compromising on the quality”.

Varispeed received the order and took just under three weeks after receiving the approved drawings to build and deliver the 12 complete VSD panels. The customer has a five year warranty to ensure peace of mind.


Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Electrical certificate of compliance (COC) for instrumentation: non-hazardous installations
June 2020, Everest Equipment & Control , Electrical Power & Protection
An instrument and control installation’s scope of work often never makes a request for a certificate of compliance: it is assumed to be an electrical function and hence many installations are non-compliant. ...

Read more...
Five tips to manage energy use while staying at home
May 2020 , Electrical Power & Protection
Covid-19 continues to impact many aspects of our lives. Many are now required to stay at home in an effort to curb the spread of the pandemic. One of the many implications of staying at home will be the ...

Read more...
Holistic approach to energy security
April 2020 , Electrical Power & Protection
As South Africans settle into the routine and inconvenience of load shedding and planning their activities around shifting electricity supply, it is businesses that are taking the biggest hit through ...

Read more...
Save energy costs with highly-efficient Delta VFDs
April 2020, ElectroMechanica , Electrical Power & Protection
Customers can realise significant savings on their total energy costs by replacing older motor starters with energy-efficient Delta variable frequency drives (VFDs), distributed locally by ElectroMechanica ...

Read more...
Utility made easy
April 2020, Schneider Electric South Africa , Electrical Power & Protection
In recognition of the growing demand for reliable power provision, Schneider Electric strives to assist network operators to deliver electricity safely and efficiently. The company’s Advanced Distribution ...

Read more...
Specialised transformers for renewable energy projects
April 2020, Zest WEG Group , Electrical Power & Protection
Zest WEG’s local transformer manufacturing facility has supplied 36 specialised photovoltaic (PV) transformers to a solar energy generation plant in the Northern Cape. According to sales team leader, ...

Read more...
Game-changing electrical accessories
April 2020, Schneider Electric South Africa , Electrical Power & Protection
In a world where products are moving from standardised to customised, today’s consumers want high quality products that meet their specific requirements. Electrical accessories are no exception and Schneider ...

Read more...
Varispeed in 2020 and beyond
March 2020, Varispeed (Div of Hudaco Trading) , News
Varispeed is a proudly South African company and is part of the JSE listed Hudaco Trading group of companies. Varispeed was founded in 1984 and is a specialist partner in electronic motor control and ...

Read more...
EnI Electrical delivers at the sharp end of African contracts
March 2020, Zest WEG Group , Electrical Power & Protection
Usually the last contractor on site, electrical instrumentation and control (EC&I) specialist EnI Electrical puts extra effort into helping clients around Africa meet their scheduled start-ups. With ...

Read more...
In-house testing of transformers
March 2020, Zest WEG Group , Electrical Power & Protection
The recent installation of an impulse voltage generator at Zest WEG’s transformer manufacturing facility in Heidelberg will allow in-house testing of transformers, saving time and money for customers. According ...

Read more...