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5.2 Replacement Parts
There are no user replaceable parts inside the Galaxy PW™.
Three levels of replacement parts are available for the Galaxy PW™ UPS. The three levels are designated A, B,
and C. The level that you should keep on hand for your installation will vary depending on the type of maintenance
planned on site, and the configuration of your UPS system. Having the replacement parts on hand will prevent any
unacceptable delays (due to time involved obtaining spare parts) during critical periods, such as system start-up.
Any items used during start-up will be replaced by MGE at no charge. Contact MGE Customer Support Services for
specific recommendations.
A description of each level is provided below:
Level Description
A This level of replacement parts consists of consumable items, specifically fuses and air filters. It is
recommended to have these items on hand during installation of the UPS systems, including initial
start-up.
B This level of replacement parts is recommended when the user can tolerate short-duration UPS down-
time to obtain replacement parts in the event of a major UPS failure. This level of replacement parts
consists of consumable items, specifically fuses, air filters, an inverter leg, and the most critical circuit
board assemblies.
C This level of replacement parts is recommended when the user can tolerate only a minimum of down-
time in the event of a major UPS failure. This level of replacement parts consists of consumable items,
specifically fuses, air filters, an inverter leg, and a complete set of circuit board assemblies.
5.2 Maintenance Isolation Procedures
CAUTION PARALLEL UPS WITH EXTERNAL MAINTENANCE BYPASS During mainte-
nance operation, when CB1 (MBP) is closed and CB2 (UPS ISOLATION) is
open, each UPS control panel display will show a message “LOAD
PROTECTED” when the UPS is placed in ON-LINE MODE. In this mode the
critical load is not protected because it is supplied by the maintenance
bypass power.
5.2.1 Single UPS Unit
During maintenance, the UPS must be isolated from the normal and bypass AC source, the battery and the load.
UPS Isolation
Proceed in the following order: (see Figure 5-2):
1. Shut down the inverter (press the "inverter OFF" button 8 for three seconds),
2. Close bypass switch Q3BP,
3. Open isolating switches Q5N, Q4S, QF1 and Q1.
The UPS is powered down once the capacitors have discharged (a few minutes).
Galaxy PW™ UPS 100 to 225kVA
Maintenance5 — 2 86-133060-00 A00