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2.15 V3 BDA/MU/RU ADDITIONAL DC OUTPUTS
There are three direct DC outputs from the BDA/MU/RU:
1. FOU (+28V/GND) in the BDA: DC28V
2. AUX (+28V/GND) in the BDA: DC28V
3. 48VDC OUT (+ 48VDC –) in the BDA: DC48V (Typical 53.5V, Nominal 51.2V)
These are shown below in Figure 45.
The two DC28V outputs, FOU and AUX, are reserved for Comba FOUs and Annunciator Panels respectively,
but can be used for other devices if they are vacant and will not be used in a future expansion of the project.
Alert! All negative terminals from the 48VDC and 28VDC outputs are tied to the
ground! Use only for +48V/+28VDC or floating DC input devices. No -48V/-28VDC
connections are allowed!
Alert! The Total Power Load the BBU PSU/Charger can support is 205W. The V3
BDA/MU/RU has a power consumption of 100W. The FOU has a power consumption of
25W. The external AP has a power consumption of 3W. When connecting devices to
the DC outputs make sure you do not exceed the Total Power Load rating!
Figure 45: V3 BDA/MU/RU Additional DC Outputs
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