APC 20 - 200 KVA Maintenance configuration, Single-UPS unit or UPS in ECO mode, UPS isolation

Maintenance

Maintenance configuration

Single-UPS unit or UPS in "ECO" mode

See figure 24. During maintenance, the UPS must be isolated from the normal and bypass AC source, the battery and the load.

◗UPS isolation

Q1

1

2

A

QF1

D

Q4S

B

Q5N

C

Q3BP

Proceed in the following order (see figure 25):

◗ shut down the inverter (press the

"inverter OFF" button 9 for three

seconds),

◗ close bypass switch Q3BP,

Fig. 24

Q1

Q4S Q3BP

Q5N

◗ open isolating switches Q5N, Q4S,

QF1 and Q1.

The UPS is powered down once the

capacitors have discharged (a few

1

Q1

Q4S

Q3BP

Q5N

1

2

0

1

OFF 0 1

QF1

OFF

minutes);

◗ start-up

2

0

1

0

1

0

1

0

1

3

0

1

OFF 0 1

0

1

Following servicing, proceed in the following order (see figure 26):

3

0

1

0

1

0

1

0

1

4

0

1

0 1 0 1

0

1

◗ close switch Q1, then after

4

0

1

0

1

0

1

0

1

approximately ten seconds, switches
QF1, Q5N and Q4S,
◗	open bypass switch Q3BP,
◗	start the inverter (press the "inverter
ON" button 8 ).

Caution

QF1
5
0	I

6 0 1 0 1 0 1 0 1

5

6

0

1

0 1 0 1

0

1

◗work should be carried 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 diagrams placed next to the switches;

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

Fig. 25 Fig. 26

34 - E-51028230XT/BG