ADTRAN DS3 NIU3 PM, Installation And Maintenance Practice

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4 Issue 5, February 2011 61213075L2-5E
CAUTION
Be careful to connect supply and return
terminals in the described configurations.
Make the following terminal connections:
• Connect the –48 V or ±24 V supply to
PWR A.
• Connect the associated return wire to
RET A
.
• If redundant power is intended, make similar
connections to
PWR B
and
RET B
.
A diode arrangement adds reliability by allowing both
DC supplies to load-share with one side picking up the
entire load if the other side fails.
Figure 3. Shelf Power Connection
Independent Power Supplies
Two optional independent power supply units are
available.
• AC/DC transformer (P/N 1212074L1) providing
48 VDC at 200 mA. Output terminals are stripped
and tinned wires.
• Power supply/rectifier (P/N 1212080L1) providing
–54 VDC at 2 amps. Output terminals are ring lugs
sized for the shelf input terminals.
Both units plug into a standard 120 VAC outlet.
AC/DC Transformer
The 200 mA AC/DC transformer is specifically
intended for use with the standalone housing (P/N
1212070L1). For the AC/DC transformer, the (red)
power wire is connected to the RET terminal and the
(black) return wire to the PWR terminal. The green wire
connects to the Frame Ground terminal (see
Figure 4 ).
Figure 4. AC/DC Transformer Connection
Power Supply/Rectifier
For the 2.0 amp power supply/rectifier unit ( Figure 5 ),
the output wire on the PS/R terminates in a modular
connector. An extension wire with a matching
connector is included. The extension wire has ring
terminals on the far end for connection to the NIU3
power terminals.
The red wire is –54 VDC and connects to the
PWR A
terminal; the black wire is the return and connects to the
RET A
terminal; the green wire connects to FGND.
NOTE
The power supply/rectifier unit is a negative
output device; therefore, red and black wires
connect
opposite of the AC/DC transformer
wires.
Figure 5. Power Supply/Rectifier Connection
PWR A
A RETURN
A SUPPLY
B SUPPLY
B RETURN
FRAME
GROUND
TB1
RET A
PWR B
RET B
PWR A
GRN
RED
BLK
TB1
48V
200mA
RET A
PWR B
RET B
PWR A
GRN
RED
BLK
TB1
-54V
2.0 A
RET A
PWR B
RET B