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Installing the DC Power Supply
Installing Terminal Block on the DC PEM Unit (A900-PWR900-D2)
Perform the following procedure to install the terminal block.
SUMMARY STEPS
1. Locate the terminal block plug.
2. Use a wire-stripping tool to strip the ends of each of the two wires coming from the DC-input power source
to 0.27 inch (6.6 mm) ± 0.02 inch (0.5 mm) and the wire for grounding. Do not strip more than 0.29 inch
(7.4 mm) of insulation from the wire. Stripping more than the recommended amount of wire can leave
behind exposed wire from the terminal block plug after installation.
3. Identify the positive and negative feed positions for the terminal block connection. The recommended
wiring sequence is (see the figure below):
4. Insert the exposed wire of one of the three DC-input power source wires into the terminal block plug.
Make sure that you cannot see any wire lead. Only wire with insulation should extend from the terminal
block.
5. Use a ratcheting torque screwdriver to torque the terminal block plug captive screw (above the installed
wire lead) from 4.425 in.-lb (.5 N-m) to 5.310 in-lb (.6 N-m).
6. Repeat Step 4 through Step 5 for the remaining DC input power source wire and the ground wire.
7. Ensure that the terminal block plug is fully seated in the terminal block header on the DC power supply
panel. The plug has a locking feature. You should hear a snap or click when it is installed properly.
8. Use a tie wrap to secure the wires to the rack, so that the wires are not pulled from the terminal block plug
by casual contact. Make sure the tie wrap allows for some slack in the ground wire.
9. Use a tie wrap to secure the wires to the handle. Leave a service loop on the ground wire between the
handle and the connector such that it is the last to receive strain if the wires are pulled.
DETAILED STEPS
Step 1
Locate the terminal block plug.
Step 2
Use a wire-stripping tool to strip the ends of each of the two wires coming from the DC-input power source to 0.27 inch
(6.6 mm) ± 0.02 inch (0.5 mm) and the wire for grounding. Do not strip more than 0.29 inch (7.4 mm) of insulation from
the wire. Stripping more than the recommended amount of wire can leave behind exposed wire from the terminal block
plug after installation.
Step 3
Identify the positive and negative feed positions for the terminal block connection. The recommended wiring sequence
is (see the figure below):
• Negative (-) lead wire (middle)
Cisco NCS 4216 Hardware Installation Guide
36
Installing the Cisco NCS 4216
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