The electronics (firing circuits/drive controller/PLC) had become obsolete and diagnostics were minimal. The existing analog controls were based on a card rack/connector/wire wrap topology. Not only were the components obsolete but card rack connections had become unreliable and intermittent with age.
Better diagnostics would reduce the excessive electrical downtime, improve mechanical reliability, optimize operator productivity, and improve coal production.
To reduce project cost and minimize installation time, the power electronic component (SCRs, Diodes, Inductors, Capacitors) along with the associated fusing and bus bars were retained. It was deemed that these components were not obsolete and replacements were readily available in the marketplace. The firing circuit/drive controller/PLC replacement only approach was specified by the client.
After evaluating several options, the customer selected Nidec Industrial Solutions to provide the upgrade.