GE Industrial Solutions GPS 4848_100 Users Guide (single rectifier shelf) - Manual (Page 65)

Galaxy Power System 4848/100 with 595 Series Rectifiers S1:3 and later
Issue 10 February 2008 Maintenance and Replacement 11 - 1
11 Maintenance and Replacement
Requirements
System With the exception of the battery, periodic maintenance specific to the
power system is not required. The ac service for the building must be
maintained with ANSI specified limits. The temperature and humidity
within the power room must be maintained within the limits specified in
Section 9 of this product manual.
Refer to Table 11-A for system replacement parts.
Batteries The batteries must be maintained as directed by the battery
manufacturer’s requirements.
Controller For replacement circuit packs for the Galaxy Millennium Controller,
refer to Table 11-B.