Polycom DOC2237A User Manual
Page 31
MGC Hardware and Installation Manual
2-11
To connect to the -48DC power system:
1.
Make sure the power switch is OFF. Turn off the DC power distribution
unit.
2.
Using the three wires 10 AWG cable running from the DC power
distribution unit, connect the black wire into the -48IN terminal block
and the red wire to the -48V RTN terminal block.
3.
Connect the green or green-yellow wire to the system single-point
“Ground” screw.
If the unit is rack mounted, the single-point ground on the MCU must be
connected to the rack with a single conductor and attached as to prevent
loosening.
When using bare conductors, they must be coated with an appropriate
antioxidant compound before crimp connections are made. Tinned,
solder-plated or silver plated connectors do not have to be prepared in
this manner.
4.
Turn on the DC power distribution unit.
COM
Ground
+
-48V
IN
-48V
RTN
ON
OFF
+
-48V
IN
-48V
RTN
ON
OFF