Alpha Technologies FXM350_Micro350 UPS - Manual (Page 35)

33 017-241-B0 Rev B
5.3 Wiring the External Batteries and Optional Battery Heater Mats
WARNING!
The batteries must be installed by qualified personnel trained in the safe use of high-
energy power supplies and their batteries. Refer to the safety section in this manual.
• Use new batteries when installing a new unit. Verify that all batteries are the same type with identical
date codes.
• Use appropriate battery voltage string for 24 and 48V versions of the products.
• If you are making your own battery wiring harness, use at least 10 AWG wires.
• The battery return connection is to be treated as an Isolated DC return (DC-I) as defined in GR-1089-
CORE.
5.3.1 Procedure
1. Place the battery heat mat(s) on the battery shelves. Refer to the manual that ships with the battery heat
mat to connect it to a power source.
2. For FXM350-48 (48V battery string), number the batteries from 1 to 4 with labels or tape. For FXM350-24
(24V battery string), number the batteries from 1 to 2 as shown in the Figure 22.
3. Coat the battery terminals with the corrosion inhibitor.
Battery #4 Battery #3 Battery #2 Battery #1
To positive terminal
To negative terminal
Optional in-line fuse
Figure 22 — External Battery Wiring (for 48 VDC string (top) and 24 VDC string)
Battery #2 Battery #1
To positive terminal
To negative terminal
Optional in-line fuse