A federal government customer experienced an issue with the starter for a critical chiller that could have threatened operations at a facility that operates 24 hours a day, seven days a week.
The customer had been troubleshooting the problem for days to no avail. Their frustration was at a very high level by the time they called in Potomac Testing Inc.’s technicians to investigate the faulty starter. While performing testing specified by the InterNational Electrical Testing Association (NETA), our field engineer specialist discovered irregularities with the autotransformer winding resistance. Reduced voltage starter systems use an autotransformer to adjust the voltage during starting. PTI located a replacement autotransformer, assisted with installation and retested the unit. PTI also recommended operating changes to the customer which would alleviate some of the issues they had experienced with the unit. After one long day, they had the chiller running as designed, and the customer had regained faith in their system.
All PTI technicians are NETA certified, receive periodic product (relay, switchgear, controls, etc.)training and understand equipment operations so they can provide recommendations and repair solutions. These individuals are also trained in the requirements of NFPA 70E (Standard for Electrical Safety in the Workplace) and can conduct the tests in a safe manner and with complete knowledge of the hazards involved.