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Polycom RMX 4000 Hardware Guide
1-19
Connecting the RMX 4000 to -48DC SELV Power
1 On the DC Power Rail Modules (PRM’s), set the two circuit breakers
to OFF. For more information on circuit breaker types, see "Types of
DC Circuit Breakers installed on the RMX 4000” on page 1-20
.
2 Ensure that the cables from the Main that supplies electricity to the
DC power units are OFF or disconnected.
3 Remove the transparent plastic caps on the terminal block.
4 Using the two wires of an 10 AWG cable running from the DC power
distribution unit, connect the black wire into the -48 VDC terminal
block and the red wire to the RTN terminal block.
• A 10 AWG cable must be used to connect the mains with the RMX 4000 DC
Power Rail Module.
• The supply wires for DC version must be terminated using quick
connectors.
• Extension cords may not be used.
ESD connector
Circuit breaker - ON
position
-48 VDC
RTN
Ground connector
Blank panel
Circuit breaker - OFF
position
The center PRM slot/module is fitted with a blank panel and the slot cannot be
used on a system with DC Voltage.