© 2011 Harmonic Inc.
36
bNSG 9000 & NSG 9000-3G, Rev D
Appendix A
Wiring the –48 VDC Power Supply
If your NSG 9000 uses the –48 VDC power supply, follow these steps to wire the power
supply.
A.1 Getting Started
Before you begin wiring the –48 VDC power supply, make sure that you provide the
necessary overcurrent protection, wires, and power connector.
A.1.1
Power Source Specifications
The DC power source feeding the NSG 9000 device must meet the following requirements:
Electrically isolated from any AC power source
Positive ground. The Positive bus of the DC power source must be reliably connected to
the Ground bus.
Each feed-pair must provide a continuous supply of power that meets the following
specifications:
NOTE:
For information on overcurrent, see
2.2.5.2 Overcurrent protection
on page 21.
A.2 Wiring Requirements
The NSG 9000 is connected to the DC power source using three wires:
–Vin
GND
+Vin
Although Harmonic provides the power input connector with the NSG 9000, you must supply
the wires.
The wires to be used must comply with the following specifications:
n
Parameter
Specification
Voltage
36 - 72VDC
Max. operating current
16A
Parameter
Specification
Suitable conductor material
Copper only
–Vin and +Vin wires
14 AWG rating
Grounding cable
14 AWG rating
Cable insulation rating
Minimum 80 C, low smoke fume (LSF),
flame retardant
