APC 6739380EN/JC Maintenance configuration, Single-unit or single modular UPS figure

Maintenance

Maintenance configuration

Single-unit or single modular UPS (figure 29)

During maintenance, the UPS must be isolated from Mains 1 and 2, the battery and the load.

◗inverter isolation

Proceed in the following order:

◗shut down the inverter (press the "inverter off" button 7 for 3 seconds),

◗close bypass switch Q3BP,

◗open isolating switches Q5N, Q4S, QF1 and Q1.

The UPS is powered down once the capacitors have discharged (a few minutes);

◗start-up

mains 2

Q1

mains 1

Q3BP

static switch

Q4S

rectifier-

chargerinverter

Q5N

load

QF1

battery

Following servicing, proceed in the following order:

◗close switch Q1, then after approximately ten seconds, switches QF1, Q5N and Q4S,

◗open bypass switch Q3BP,

◗start the inverter (press the "inverter on" button 6 ).

Fig. 29
Caution:	◗ to avoid interrupting the load, the
◗ work should be carried out in	various switching operations must
accordance with applicable safety	be carried out in the correct order.
regulations;	Operations are explained in
	diagrams placed next to the
	switches.

Multi-bypass modular UPS

(figure 30)

Prior to servicing a given UPS, it must be isolated from Mains 1, Mains 2, its

Modular UPS 1 Q3BP

battery and the load outputs of the other UPSs (in this case, never operate the Q3BP switches in the units).

◗isolate the UPS

Proceed in the following order:

◗ shut down the inverter (press the

"inverter off" button 7 for three

seconds);

◗ open isolating switches Q5N, QF1,

Q4S and Q1 in the unit.

The UPS is de-energised once the

capacitors have discharged (a few

mains 2

Q1

mains 1

static switch

Q4S

rectifier-

chargerinverter

Q5N

QF1

battery

minutes).

◗ start-up

Once servicing is completed, proceed in the following order:

◗close Q1, then QF1, Q4S and Q5N;

◗start the inverter (press the “inverter on” button 6 ).

Note. It is strongly advised to call on our after-sales support department for these operations.

Modular UPS 2

mains 2

rectifier- charger

Q1

mains 1

Q4S

QF1

Q3BP

load

static switch

inverter

Q5N

battery

Fig. 30

6739380EN/JC - Page 31