5.3 Wiring the External Batteries
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.
For the FXM 650-24, the battery string is 24 Vdc. For the FXM 650-48/1100/2000, the battery string is 48
Vdc.
If you are making your own battery wiring harness, use at least 10 AWG (for FXM 650/1100) or 8 AWG
(FXM 2000) 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
NOTE
:
The optional in-line fuse option shown in Figure 8 on page 18, is available as part number SPB98-645- 1,
Kit, Fuse Upgrade, 100A.
1. For FXM 650-48/1100/2000 (48 V battery string), number the batteries from 1 to 4 with labels or tape. For
FXM 650-24 (24 V battery string), number the batteries from 1 to 2 with labels or tape.
2. Coat the battery terminals with the corrosion inhibitor.
3. Connect the batteries as shown in Figure 8 on page 18. If used, install the in-line fuse as shown.
4. Connect the black battery cable to the negative terminal of the battery string, and the red battery cable to
the positive terminal of the battery string.
5. When the batteries are wired, measure the voltage at the battery connection terminals. It should read
between 42 and 54V for the FXM 650-48/1100/2000 or 21 and 27V for the FXM 650-24.
6. Note the polarity and ensure it is correct.
7. Ensure that the DC breaker if OFF.
8. Connect the external batteries to the Battery connector—location in Figure 1.
9. Route the sensor end of the battery temperature cable to the batteries.
10. Attach the battery temperature sensor to the body of the battery, about 2 to 3" (5 to 7.5 cm) from the base
of the battery.
11. If multiple battery strings are used, repeat steps 1 to 4 as required.
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