GE Industrial Solutions Galaxy Verification - Manual (Page 76)

Galaxy Power System Verification Procedures
4 - 8 Replacement Procedures Issue 3 January 2008
Requirements
System With the exception of the batteries, 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
the product manual.
Batteries The batteries must be maintained as directed by the battery
manufacturer’s requirements.
Rectifiers With the exception of a fan failure, rectifiers are repaired by
replacement. Refer to “Installing or Replacing a Rectifier” in this
section.
Rectifier Fan
Assembly
The expected life of the rectifier fans at 25°C (77°F) is approximately
eight years. The fans in the rectifiers may be replaced in the field.
Two approaches can be taken to fan maintenance:
• The first approach is to replace the fan on a routine basis every
seven to eight years; this ensures that the fan does not fail in the
field under normal operating conditions. This approach is
appropriate when there are no remote alarm facilities at the site.
• The second approach, assuming one has remote alarm capability, is
to wait until the fan fails. The rectifier will safely shut down and
issue both a fail alarm and a thermal alarm. The fan can then be
replaced. Since it is likely that all the rectifiers in that installation
are of roughly the same age, all rectifier fans at that site should be
replaced at that time.
The approach used depends on the location and manning of the site as
well as the monitoring of alarms used at the site. Refer to “Replacing a
Rectifier Fan Assembly” in this section.
Note: As a routine procedure, keep fan assemblies dust-free.