An external cable short circuit and fire destroyed a discontinued ABB DCS800 DC drive. DUCHENG built a controlled recovery path from available DCS502 and DCS800 components, returning rolling mill No. 17 to production; the published record reports more than 120 days of stable operation afterward.
At about 22:00 on December 14, 2024, the No. 2 main-motor control system on rolling mill No. 17 at Jiangsu Dingsheng New Energy Materials suffered a sudden failure. An external cable short circuit and fire destroyed the ABB DCS800-S02-1500-07 DC drive and stopped the production line.
The constraint: a discontinued product and no complete spare
The series had been out of production for years, so a normal whole-unit replacement could not provide a rapid recovery. DUCHENG dispatched engineers to site while internal specialists reviewed the problem remotely and assessed the equipment and serviceable parts available.
The response: a controlled rebuild from serviceable components
The recovery used the base and firing board from a retired ABB DCS502B1503-41 together with serviceable DCS800 control, power-supply and field-excitation boards. The joint technical team completed installation, checks and the return to operation.
The result: production restored and verified in operation
Rolling mill No. 17 returned to normal production. In the project record published in April 2025, the restored drive system had operated for more than 120 days without a reported fault. The client subsequently recognized the response and cooperation in a letter of commendation.
This is a record of an emergency recovery under specific equipment conditions. Feasibility in another installation depends on equipment condition, compatible parts, technical documentation, authorization and site safety; it is not a general replacement method.
