MGE UPS Systems Galaxy PW Maintenance configuration, Single-UPS unit, UPS isolation, Start-up

Galaxy PWTM 100 to 225 kVA

maintenance

maintenance configuration

single-UPS unit

See figure 19. 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 20):

Q1

1

2

A

QF1

D

Q4S

B

Q5N

C

Q3BP

❏ shut down the inverter (press the "invert-

er OFF" button 8 for three seconds),

❏ close bypass switch Q3BP,

❏ open isolating switches Q5N, Q4S, QF1

and Q1.

Fig. 19

The UPS is powered down once the

capacitors have discharged (a few min-

utes);

■ start-up

1

Q1

Q4S

Q3BP

Q5N

Q1 Q4S Q3BP Q5N

1	1		0	1
	0	OFF			OFF

QF1

Following servicing, proceed in the follow-

ing order (see figure 21):

❏ close switch Q1, then after approximate-

2

1

0

1

0

1

0

1

0

1

2

	1	0	I
3				1		1
	0	OFF	0		0

ly ten seconds, switches QF1, Q5N and

0

1

1

0

1

0

Q4S,

1		1		1
1	0		0

❏ open bypass switch Q3BP,

❏ start the inverter (press the "inverter ON"

button 7 ).

CAUTION

4	1		1		1		1
	0	0		0		0
			QF1
5
			0	I

6	1	0	1	0	1	0	1
	0

4	0	0
5	1		1		1		1
	0	0		0		0

6

■work should be car- ried out in accordance with applicable safety regulations;

■to avoid interrupting the load, the various switching operations

must be carried out in the correct order. Operations are explained in dia- grams placed next to the switches;

■the system cabinet is only partially powered down. The load is still supplied via the bypass AC source and switch Q3BP.

Fig. 20 Fig. 21

28 Maintenance