GE Industrial Solutions GPS 4848_100 Users Guide (single rectifier shelf) - Manual (Page 72)

Galaxy Power System 4848/100 with 595 Series Rectifiers S1:3 and later
11 - 8 Maintenance and Replacement Issue 10 February 2008
Replacement Procedures, continued
Removing a Rectifier, continued
Step Action
8 If the removed rectifier is below the top rectifier in its cabinet, it
must be replaced immediately or the vacated position must be
occupied by a Rectifier Shelf Cover 848680211.
If a spare rectifier or Rectifier Shelf Cover is not available, a
rectifier from the top position must be relocated to occupy the
vacant position.
Temporarily relocated rectifiers retain their rectifier ID and require
no configuration changes for alarm free operation.
Follow rectifier removal and installation procedures to relocate a
rectifier.