Zest pioneers remote acceptance testing during lockdown
April 2020
News
In an innovative step to keep a customer’s mining project in the Democratic Republic of Congo (DRC) on schedule despite the impact of Covid-19, Zest WEG successfully conducted a remote witness test of medium voltage VSDs in WEG’s Brazil factory.

David Spohr.
“These are extraordinary times that require extraordinary measures,” says David Spohr, business development executive for high-voltage equipment at South African-based Zest WEG. “With the restrictions on international travel, we had to think creatively about how to complete this final step in the manufacturing process before the equipment could be shipped to the DRC site.”
Under normal circumstances, these tests would require the customer to travel to Brazil and spend a week at the factory witnessing and signing off a range of detailed test and equipment requirements.
“It was essential that we did not delay the customer’s project, so we arranged to conduct the witness test using web-based communication software,” says Spohr. “This allowed the participation of Zest WEG experts, the engineering contractor and the end-user, all from the safety of their homes in Johannesburg, communicating with five testing technicians in the WEG factory in Brazil.”
Using a high-definition camera and web-based communication software, the factory technicians were able to walk the contractor and end-user through each element of the FAT, with clear and real-time visual images of the test results and equipment on the factory floor. The tests continued for three days and covered three key areas – PLC communication software integration, full functional testing and full load testing.
“As with any other witnessed FAT, the customer was provided with a comprehensive results report by WEG,” explains Spohr. “This enabled the customer to check that the remote FAT results were within the required tolerances.”
Spohr notes that this pioneering step is likely to influence the way that these tests are done in future. “It has shown that the testing can be done to the same standards, but with significant savings in time and cost,” he concludes.
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