Connecting The Batteries - Emerson Liebert NXC User Manual

Liebert NXC Battery
6. In the case of a parallel UPS system that uses a common battery bank, an additional isolating device (switch) must be
installed in the dedicated common battery connection to each individual UPS, so that system maintenance can be carried out
correctly. In any event, we advise against using common battery solutions as they reduce the reliability of the system.
7. Measure the battery voltage and calibrate the battery voltage after starting up the UPS.

2.3.3 Connecting the Batteries

1. Check that the battery fuses are not inserted. These must be fitted during commissioning, NOT during installation.
2. If the battery cabinet is installed on a raised floor or side by side with the UPS on a solid floor, the battery power cables and
other cables can enter the UPS cabinet through the base of the cabinet. The cables for connecting the UPS to the battery
cabinets are not included in the delivery. They can be provided by the manufacturer upon request. For the best interference
suppression (to reach class C2 EM) we recommend using shielded battery cables between the UPS cabinet and the battery
cabinet. The shielding must be connected to both the UPS and the battery cabinets.
3. Make the ground connections (PE).
4. When multiple battery strings are used, they must be connected in series and then in parallel. Before applying load and
commencing power-up, be sure to measure the total voltage of the battery strings and make sure that it is correct. The
negative and positive terminals of the battery must be connected to the corresponding negative and positive battery
terminals of the UPS, in accordance with the labels on the battery and the UPS. Reverse battery connection may result in
explosion, fire, damage to the battery, damage to the UPS, or personal injury.
5. After connecting the battery cables, install an insulating shroud for each terminal.
6. The bending radius of the cable is to be larger than 10D, where D is the outer diameter of the cable.
7. After connecting the cables, do not pull on the battery cables or the cable terminals.
8. Do not cross the battery cables during connection and do not tie the battery cables together.
9. To connect the cables for the internal batteries, refer to Figure 2-1 and Figure 2-2. To connect the cables for the external
batteries, refer to the "Battery Installation Manual".
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