Procedure: Install Redundant Power Feeds - Cisco ONS 15327 User Documentation

Chapter 1 Hardware Installation
Always use the supplied ESD wristband when working with a powered ONS 15327. Plug the wristband
Caution
cable into the ESD jack located between the top high-speed and XTC slots.
Warning Do not mix conductors of dissimilar metals in a terminal or splicing connector where physical contact
occurs (such as copper and aluminum, or copper and copper-clad aluminum), unless the device is
suited for the purpose and conditions of use.
Use the following wiring conventions:
•
•
Use an external disconnect for service purposes and install it according to local site practice.
Note
The ONS 15327 has redundant -48V DC power terminals on the MICs. The terminals are labeled PWR
A and PWR B and are located on the far right-hand side of the MICs if you are facing the shelf assembly.
Both MIC A and MIC B must be installed to create redundant power connections.
To install redundant power feeds, use four power cables and one ground cable. For a single power feed,
only two power cables and one ground cable are required. Use #12 AWG cable and, to ensure circuit
overcurrent protection, use a conductor with low impedance. However, the conductor must have the
capability to safely conduct any fault current that might be imposed. Do not use aluminum conductors.
The MIC power connector is shipped with the fastening screws inserted but not tightened. The screws
may have tightened due to vibration during shipping. Make sure the screws are loose before attempting
to remove the connector.
Warning A readily accessible two-poled disconnect device must be incorporated in the fixed wiring.
Connect the unit only to DC power source that complies with the Safety Extra-Low Voltage (SELV)
Warning
requirements in IEC 60950 based safety standards.

Procedure: Install Redundant Power Feeds

Step 1 Terminate the chassis ground to either the office ground or rack ground.
The ground connection point is located on the left-hand side panel as you face the ONS 15327.
Note
Measure and cut the cables as needed to reach the ONS 15327 from the fuse panel. Use the correct size
Step 2
fuse for each power lead.
Dress the power and ground cables according to local site practice.
Step 3
June 2002
Red wire for battery (-48V DC) connections
Black wire for battery return (0V DC) connections
To ensure that the equipment is properly grounded, use the provided 12 AWG dual-hole
grounding lug and the #10-32 x 3/8 pan head phillips power lug screws to connect the ground
cable to the chassis. Apply 30-36 in.-lbs of torque when tightening the screws.
Power and Ground Installation
Cisco ONS 15327 User Documentation, R3.3
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