Otis · DSD 412 DC Elevator Drive
One or more of the three AC line fuses are open. This condition is checked during power-up and can be requested via the PCU F#998 Diagnostics function. Detection is achieved by measurements from voltage dividers on the Armature Interface PCB (A2).
Click steps to track your progress.
Inspect and replace any blown AC input fuses.
Check all AC power wiring connections for tightness and integrity.
Test the DSPR power relay for proper operation.
Utilize the PCU F#998 Diagnostics function to pinpoint which AC line fuse is open.