MGE UPS Systems Galaxy PW User Manual

See figure 3 showing two parallel-connect-
ed (redundant) UPS units.

When increased power is required (two to
four parallel units), an external bypass
must be added (see figure 4).

(See figure 1 on previous page):

■

Q1 (Molded circuit breaker NA):

❏

isolation of the rectifier/charger (A) from

the normal AC source (1);

❏

rectifier/charger (A) start-up;

■

QF1 (circuit breaker):

❏

battery (D) protection and isolation;

■

Q5N (switch):

❏

isolation of the UPS (B) from the load;

■

Q4S (switch):

❏

isolation of the static bypass (C) from

the bypass AC source  (2);

■

Q3BP (switch):

❏

bypass switch for maintenance;

■

FUE (fuses):

❏

protection of the rectifier/charger (A)

from the normal AC source;

■

FUS (fuses):

❏

protection of the inverter (B) from the

load.

■

switch Q3BP is lock on open position on

parallel UPS systems constituted to
increase available power.

See figure 4.

■

Q5N: isolation of the inverters of all the

parallel UPS systems from the load;

■

Q3BP: bypass for maintenance.

Q3BP

Q5N

Q3BP

S

Q5N

Introduction