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

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