Connecting Battery Cables - Liebert UHA1R-0100 User Manual

20 Chapter 2 Single UPS Installation And Commissioning
For split-bypass configuration, an upstream MCB (125A MCB is recommended) must be used at the bypass input end.

2.5.2 Connecting Battery Cables

External battery string connection principle diagram of the self-distribution
The default battery number of the UPS is 16 cells. The principle diagram is shown in Figure 2-22.
1. As shown in Figure 2-22, a DC battery MCB must be added between the battery string and the main UPS.
2. The Bat_PE of the UPS must be connected to the metal enclosure of the battery cabinet directly and reliably, and the wiring of
the Bat + and the Bat – should be laid side by side and be the same direction to make sure that only one point for the system is
earthed.
Notes
Before connecting the battery cables, check that:
1. The battery string comprises batteries of the same manufacturer, same model, and same use state.
2. The battery number complies with the UPS specifications, that is, sixteen 12V batteries are connected in series.
3. Confirm with a voltmeter that the battery string voltage is about 200Vdc after the series connection.
1. Non-professionals are prohibited from connecting the battery cables.
2. It is prohibited to reverse the positive pole and negative pole of the battery.
3. Different UPSs cannot use the same battery string. Otherwise, the UPS will be damaged.
4. The battery cable length of the standard UPS is 0.5m, and that of the long back-up UPS is 1.5m. It cannot be extended
unlimitedly (≤ 3m).
5. Turn off the UPS before replacing the battery and connecting the battery cables.
Connecting battery cables of standard UPS
The standard UPS provides a battery cable A (length: 0.5m), which is used to connect the battery module to the UPS,
as shown in Figure 2-23.
Figure 2-21 Cable connection for 3-input 1-output, split-bypass configuration
First cell Second cell
＋ ＋
－ －
Figure 2-22 Battery module connection principle diagram
Liebert ITA 10kVA UPS User Manual
®
Input bypass
N A
警告 危 险
Note
Third cell Sixteenth cell
＋ ＋
......
－
警告 危 险
Warning
警告 危 险
Note
B C PE PE L N
Input Output
Bat +
－
Bat_PE
UPS
Bat -