22 Eaton Ferrups FX UPS P-164000906 Eaton Ferrups FX User’s Guide P-164000906—Rev 05
Never install the batteries in a air tight enclosure.
6. The Eaton Ferrups FX external battery cabinets come with a battery installation diagram. Refer to this
diagram for proper battery and cable connections.
7. Find the battery cable assembly that connects to the UPS. (If you have a removable DC plug at the UPS
end, note that this end of the cables does not go through the conduit or connect to it.)
Do not connect the external battery cables to the UPS at this time, but pull them through the conduit from
the UPS to the cabinet or rack. Do not connect the cables to the batteries or cabinet terminals yet.
If you have more than one external battery cabinet, find the battery cable assembly that will connect the
external battery cabinets. Pull the cables through the conduit that you installed between the cabinets.
8. Clean the cable and battery post (terminal) before you make the battery connections. Apply a thin coating
of high-temperature conductive grease on the post and cable terminals to slow corrosion.
If you use a nonconductive grease like petroleum jelly, do not apply any grease before you make the
connections. After you have made the connection, apply a coating of the nonconductive grease to the
hardware at the battery terminals.
When you make battery terminal connections, use the torque wrench to tighten the battery terminal
connections securely.
9. Connect the battery cables between batteries as shown in the battery installation diagram. Do NOT
connect the cables between battery strings or between the UPS and the batteries yet. If you are only using
one string of batteries, go to Step 12.
10. If you are connecting more than one battery string, connect the positive cables as shown in the battery
installation diagram. Next, use the voltmeter to check the DC voltage between the negative terminals of
the strings. The measured voltage should be less than 3V. If it is more than 3V, correct any wiring errors
before you continue.
11. Use the cables provided to connect the negative (-) battery terminals of the battery strings as shown in the
battery installation diagram. If the external battery cabinet has a DC switch, the DC switch has been
installed at the factory.
12. To connect external batteries to your UPS, follow the instructions for your model.
If your external battery cabinet has a DC breaker or switch, verify that the breaker or switch is in the OFF
position; then, find the battery cables between the UPS and the batteries. The removable DC connector at
one end of the cables connects to the UPS, and the other ends of the positive and negative cables connect
to the external battery cabinet. You should connect the cables to the battery cabinet first. Refer to the
battery installation diagram as that come with the UPS as you follow the steps below.
If your external battery cabinet has a DC breaker or switch on the front, the positive and negative cables
connect to the terminal strip in the back of the external battery cabinet. First, find the positive (+) cable,
and strip 0.5" (1.3 cm) of insulation from the end. Insert the cable into the positive (+) external battery
cabinet terminal. Next, strip 0.5” ( 1.3cm ) of insulation from the end of the negative (-) cable, and connect
that cable to the negative (-) terminal in the external battery cabinet. Tighten both terminal connections
securely.
Now, connect the battery cables to the UPS by plugging the removable DC connector into the matching
connector on the back of the UPS.
If the external battery cabinet has a DC breaker or switch, turn the breaker or switch to the ON position.
13. Use the meter to check for proper nominal DC voltage at the UPS end of the cable. Verify that the polarity
agrees with the markings on the UPS battery terminals.
Battery Cabinet Installation
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