Galaxy PW™ UPS 100 to 225kVA

5.2Replacement 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

AThis 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.

BThis 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.

CThis 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.

5.2Maintenance 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.

 

 

5.2.1Single 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).

5 — 2

Maintenance

86-133060-00 A00