Allied Telesis Removable Power Supply and Fan - Manual (Page 14)

Installation Guide
13
Connecting a PWR01 DC power supply
Follow these instructions to connect an AT-PWR01 DC PSU to a DC power
supply. Only trained and qualified personnel should connect a DC power supply.
You need an appropriate DC power source, DC supply cable, ring connectors, a
crimp tool and an appropriate screwdriver to tighten the terminal screws.
For centralised DC power connection, the switch should be installed in
restricted access areas only (such as dedicated equipment rooms or
equipment closets) in accordance with Articles 110-16, 110-17, and 110-18 of
the National Electrical Code, ANSI/NFPA 70.
Power supply specifications:
■ 40 to 60V, 48V nominal
■ supports either positive grounded or negative grounded operation
■ a 15Amp certified/listed circuit breaker is required for circuit protection
Supply cable specifications:
■ three-core cable is required
■ minimum core size: 3.3mm
2
(12 AWG) high strand count copper wire
■ minimum cable rating: 600V, 90 degrees C
Warning Disconnect the power supply cable before starting this procedure.
1. Remove the transparent protective terminal cover.
2. Strip the supply cable wires to expose 7.5mm (0.31 in.) of bare conductor.
Terminate the wire with a nylon insulated solderless ring tongue terminal,
JST FN5.5-5 or equivalent, using a crimp tool.
3. Connect the ground wire to the ground terminal. Use the diagram on the
rear panel of the switch to identify terminals. Tighten the terminal to
between 2.4 and 4.0 Nm (21.3 and 35.4 lbf in).
Warning In order to avoid damaging the PSU, make sure that the PSU
terminals are wired to the correct polarity.
Warning When x900-24 units are connected with VCS stacking cables
(XEM-STK-CBL) ensure that all the PSUs are appropriately grounded. This
is to avoid large circulating ground currents that could damage the stacking
cables. To achieve this ensure that: