|
|
This chapter describes how to use the dual redundant power supplies. The chassis ships with standard AC power, but you can order optional DC power supplies. For information on replacing a power supply, see the "Replacing a Power Supply" section. For information about LEDs, switches, and ports, see the "AC Power Supply Specifications" section and the "DC Power Supply Specifications" section.
 |
Warning Read the installation instructions before you connect the system to its power source. |
|
Warning Before you work on a chassis or working near power supplies, unplug the power cord on AC units; disconnect the power at the circuit breaker on DC units. |
|
Warning Before you work on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. |
|
Warning Secure all power cabling when you install this unit to avoid disturbing field-wiring connections. |
|
Warning Care must be given to connecting units to the supply circuit so that wiring is not overloaded. |
|
Warning Incorrect connection of this or connected equipment to a general purpose outlet could result in a hazardous situation. |
|
Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected. |
The chassis ships with standard dual redundant AC power supplies. For information about the optional DC power supplies, see the "Using the DC Power Supplies" section. The following sections describe how to set the voltage and plug in the dual power supplies.
The default voltage setting is 115 VAC (marked 115 on the voltage switch). If your electrical system requires 230 VAC, change it manually on the device before you plug it in. To change the settings, follow these steps.
|
Warning A voltage mismatch can cause equipment damage and may pose a fire hazard. If the voltage indicated on the label is different from the power outlet voltage, do not connect the chassis to that receptacle. |
Step 2 Using a flat-blade screwdriver, slide the switch to the appropriate voltage:
To plug in and turn on chassis power, follow these steps.
Step 2 Make sure the power is off by pressing 0 on the switches.
Step 3 Plug the supplied power cords into the power receptacles.
Step 4 Turn on the power by pressing 1 on the switches.
|
Warning This unit might have more than one power supply connection. All connections need to be removed to de-energize the unit. |
You can order optional dual redundant -48 VDC power supplies for connection to DC power. The following sections describe how to wire the provided power connectors and alarm connectors, and how to reset a power alarm.
|
Warning Connect the unit only to DC power source that complies with the Safety Extra-Low Voltage (SELV) requirements in IEC 60950 based safety standards. |
|
Warning Before you perform any of the following procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position. |
|
Warning This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation. Install only in accordance with national and local wiring regulations. |
Each -48 VDC power supply includes a receptacle for a power connector. You must wire the provided connectors to the DC power source before plugging them into the power supplies.
For the DC power requirements, see the chassis back panel.
Figure 2-2 shows the wire locations for the DC power connector.
Wire both power connectors as described in the following steps.
|
Warning Use copper conductors only. |
|
Warning A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. |
Step 2 Strip 0.125 inches (0.3175 cm) of insulation from the end of a 14 AWG green frame ground wire. Do not strip more than 0.125 inches.
Step 3 Insert a medium flat-blade screwdriver into the connector bottom hole and loosen the screw (Figure 2-3).
Step 4 Insert the frame ground wire into the bottom slot while you tighten the screw (Figure 2-4).
Step 5 Repeat steps 2, 3, and 4 to insert the following wires:
Step 6 Externally fuse the -48 VDC power wire with a 15-ampere (A) fuse.
Step 7 Plug the DC power connectors into the bottom connectors on the right and left power supplies (Figure 2-5).
Step 8 Turn on the DC power source.
The -48 VDC power supplies include three receptacles for alarm connectors: one each for critical, major, and minor alarms. If any power supply malfunctions, the system sends an alarm of the appropriate severity to an external alarm device. See the label next to each connector to determine its severity.
The alarm relay switches support normally open and normally closed positions. An alarm device that uses a normally open switch has an open contact when there is no alarm. A normally closed device has a closed contact when there is no alarm.
Figure 2-6 shows the wire locations for the alarm connector.
Wire the provided alarm connectors as described in the following steps.
Step 2 Insert a medium flat-blade screwdriver into the connector middle hole and loosen the screw (Figure 2-7).
Step 3 Insert one wire to serve as the COMM wire into the middle slot while you tighten the screw (Figure 2-8).
Step 4 Repeat steps 2 and 3 to insert the other wire:
Step 5 Plug the three alarm connectors into the top connectors on the right and left power supplies and the middle connector on the right power supply.
If you plug in the alarm connector before you connect the power, the alarm activates continuously. To avoid activating the alarm, plug in the power before you plug in the alarm (Figure 2-9).
The chassis alarm activates in the event of a power interruption or a system failure. Push the Alarm Cutoff button on the front of the chassis to reset the alarm (Figure 2-10).
If the system is still running despite alarm activation, power was probably disrupted by a temporary power failure.
If the system is not running, the cause of the alarm is either a continuing power failure or a catastrophic system failure. To determine the cause of the alarm, check the LEDs on the power supplies:
Posted: Wed Sep 27 11:55:24 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.