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Assembling the Battery Pack
7
NXA-UPS1500 Uninterruptible Power Supply
Assembling the Battery Pack
Overview
The UPS battery needs to be assembled before installation: the battery pack consists of four individual
batteries, a connector wiring package (one large wire harness with two black and two red wires attached
to a four-pin connector and two separate red wires), and the aluminum battery case components.
Each battery has color-coded contacts, with red for "positive" and black for "negative". Each battery will
lie on its side in the battery case, as part of a pair, with the contacts of one at the opposite end as the
contacts of the other. The completed battery case will not slide into the unit when wired if the batteries
are not in this position when the case is assembled. (See FIG. 6).
1. Remove the batteries from their packing material and stand them upright on the bottom of the
battery case, making two pairs. Alternate the batteries so the contacts of one in each pair are
opposite the contacts of the other. (See FIG. 3)
2. With the contacts facing up, take the large wire harness (the one with the yellow 4-pin connector at
one end) and connect each pair to the assembly. Make sure that the color of each wire, red or black,
matches the color of the battery contact. Only attach one wire from the harness to each battery.
3. The remaining two wires from the wiring package complete the serial circuit. Connect the red wire
first to a red contact on one battery and then to a black contact on the other in the pair. Likewise,
connect the black wire first to the remaining black contact, then to the remaining red contact in the
second pair.
4. At this point, flip the batteries so that their wide and long sides face down. Make sure that the
contacts of each battery face the side containing contacts on the other in its pair. Gently put tension
on the wires to take up any slack; the wire harness should be hanging to one side. The wires
themselves should run between the battery pairs until they emerge from the side. If any wire should
hang over the top of the batteries, gently press it down between the batteries to keep it out of the
way.
5. Assemble the battery case around the battery pairs. When installing the battery in the unit, the wire
assembly will hang out from the right side of the battery pack.
FIG. 3 Connecting the batteries to each other and to the 4-pin connector
When attaching the wire harness to the battery pairs, note the red-black wire pairs
coming from the connector. The black and red wires in each set emerging from the
connector must be attached to its matching contact in only one battery pair;
connecting a red wire to one battery pair and a black wire to the other battery pair will
not complete the circuit and the battery pack will not work.