APC 6739380EN/JC user manual Battery maintenance, Vented lead-acid batteries

Maintenance (cont.)

In non-redundant systems with a Mains 2, the load is supplied by the Mains 2 and the Static Switch Cubicle. In non-redundant systems without a Mains 2, the entire system must be shut down.

◗start-up

Following servicing, proceed in the following order:

◗close switch Q1, then switches QF1, Q5N and Q4S,

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

Note:

We recommend that you call on the after-sales support department to carry out these operations.

Static Switch Cubicle

During maintenance, the Static Switch Cubicle must be isolated from Mains 2, the load and the parallel UPSs.

◗if work is required on the control electronics alone, open cubicle switch Q4S (but not Q5N) and cubicle fuse switches Q1 and Q2. The load can then remain supplied by the UPSs. After servicing, reclose fuse switches Q1, Q2 and switch Q4S.

Caution:

When the Static Switch Cubicle is powered down using the above procedure, only the control electronics are in fact powered down. The power circuits remain energized. Maintenance on the static switch power circuits requires shutdown of the UPSs and transfer of the load to the maintenance bypass line.

mains 2

Q1

mains 1

Q1

mains 1

	Q3BP
Q4S	Q5N
	load

Q5N

QF1

Q5N

QF1

◗open switch Q5N, then the disconnector-fuses Q1 and Q2 in the SSC;

◗open switches Q5N, then switch Q4S on all the UPSs (figure 33).

Caution:

Even in the maintenance bypass configuration, the cubicle is only partially shut down and the supply of power to the load continues via switch Q3BP.

◗more extensive maintenance work on the Static Switch Cubicle requires the entire system to be shut down.

Fig. 33

Note:

We recommend that you call on the after-sales support department to carry out these operations.

Battery maintenance

Consult the instructions supplied by the battery manufacturer. Below are a few general indications:

◗sealed lead-acid batteries. These batteries require no maintenance:

◗but check the terminals of each cell from time to time and clean if necessary;

◗vented lead-acid batteries:

◗check the electrolyte level regularly and add water if necessary,

◗check the voltage of each cell to determine if it is necessary to equalize the battery,

◗check the terminals of each cell and clean if necessary.

Caution:

Battery maintenance is undertaken with the system powered up. Operations must be carried out in accordance with applicable safety regulations by qualified personnel using insulated tools, gloves and safety goggles.

Batteries contain dangerous substances that will harm the environment if thrown away. If you change the batteries yourself, call on qualified organizations for battery disposal and recycling.

Pb

Pb

6739380EN/JC - Page 33