Otis · DSD 412 DC Elevator Drive
One of the SCR/Doubler packs has a short circuit between the SCRs. This condition is checked only upon request through the PCU #998 Diagnostics CDU function. The optional handheld PCDU can also identify the specific SCR pair that is faulty. A DSD Power Down is required.
Click steps to track your progress.
Initiate a DSD Power Down for the drive.
Run the PCU #998 Diagnostics CDU function to identify the specific shorted SCR/Doubler pack.
If available, use the optional handheld PCDU to identify the exact shorted SCR pair.
Replace the identified shorted SCR/Doubler pack.