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2.13 V3 BDA/MU/RU AND BBU SYSTEM WIRING
Comba recommends that every horizontal cable entry to the equipment forms a 'U'
before its entry to the equipment. Water on the cable will drip down at the bottom of the
loop and will not accumulate at the equipment connectors. This will help prevent
corrosion and wear to the metal connectors and cabinet.
Figure 33 shows the Hybrid Cable which is provided with the V3 BBU. The Hybrid Cable carries AC Power
from the BBU to the BDA charger, DC Power from the BDA to the battery (path reversed AC Power is lost
and batteries are discharging), and RS485 communications from the battery to the BDA. One end of the
cable is connectorized from the factory for convenience. This end is to be connected inside the BBU. The
other end has sleeved wires and is to be connected inside the BDA/MU/RU.
Figure 33: V3 BBU to BDA/MU/RU Hybrid Cable
The copper wire from the Hybrid cable can provide additional shielding for the RS485 wires. It can be
connected to the GND connection points in the BBU and BDA shown below in Figure 34.
Figure 34: Hybrid Cable Shielding Wire Installation
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