Installation manual

UT340, UT360, UT380, and UT3100
Planning and Installation Manual
20

Clean the cables and battery terminals before making the battery connections. Apply a thin
coating of conductive grease before making the battery connections, or apply petroleum jelly
to the entire connection after it has been made.

Torque battery connections to the battery manufacturer’s specifications.
Follow the steps below and any instructions provided with the battery system:
1. Connect the cables
between batteries
.
a. In each battery string, connect the cables between batteries as shown in the battery
installation diagram provided with the batteries.
b. Meter the positive (+) and negative (–) terminal on each battery string to verify proper
nominal voltage and polarity.
2. Connect the battery cables
between battery strings
.
a. Connect the negative (

) cables between battery strings as shown in the battery
installation diagram provided with the batteries.
b. Meter the DC voltage between the positive terminals of the strings. The voltage should
measure less than 5 volts. If it measures greater than 5 volts, correct any wiring errors
before you continue.
c. Connect the positive (+) cables between battery strings as shown in the battery
installation diagram provided with the batteries.
3. Install the DC disconnect (DCD) and pre-charge/discharge switch. Refer to Figure 3, 4 or 5
and to any instructions provided with the DCD and pre-charge/discharge switch.
4. Connect the external batteries to the UPS.
a. Connect the positive (+) cable(s) to the UPS first. Install ring connectors for 10 mm
bolts as required.
b. To prevent short circuits, insulate the UPS end of the negative (–) cable(s).
Do not connect the negative (–) cables to the UPS yet.
c. Connect the positive (+) cable(s) to the battery system and tighten to the proper torque
specifications.
d. Connect the negative (

) cable(s) to the battery system and tighten to the proper torque
specifications.