|
|
This chapter describes how to use the power supply. The chassis comes standard with AC power, but you can order an optional DC power supply. For information about 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 working 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 working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will 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 installing 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 comes standard with an AC power supply. For information about the optional DC power supply, see the "Using the DC Power Supply" section. The following sections describe how to set the voltage and attach the power cord retainer.
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 plugging it in.
|
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. |
To change the settings, follow these steps.
Step 2 Remove the voltage setting Warning label from the power port.
Step 3 Grip the front bezel top lip or bottom lip firmly, and forcefully pull the bezel off the chassis.
 |
Note If you need to loosen the bezel from the chassis, insert a flat-blade screwdriver under the bezel at the stud locations, as shown in the following figure. |
Step 4 Using a flat-blade screwdriver, slide the switch to the appropriate voltage:
Step 5 Leave the front bezel off to install a power cord retainer according to the next section.
Replace the front bezel by lining up the six studs with the chassis holes and pressing the bezel firmly against the chassis until the studs snap into place.
The power cord retainer prevents the power cord from being accidentally pulled out. Complete the following steps to install the retainer.
Step 2 If you have not already done so, remove the voltage setting Warning label from the power port.
Step 3 If you have not already done so, remove the front bezel by gripping its top lip or bottom lip firmly, and forcefully pulling the bezel off the chassis.
If you need to loosen the bezel from the chassis, insert a flat-blade screwdriver under the bezel at the stud locations, as shown in the following figure.
Step 4 Remove the power supply screw, and use it to attach the retainer.
Step 5 Replace the front bezel by lining up the six studs with the chassis holes and pressing the bezel firmly against the chassis until the studs snap into place.
Step 6 Plug in the power cord and attach the plug to the retainer using the provided cable tie.
Step 7 Turn on the power by pressing the switch.
|
Warning The power supply cord is used as the main disconnect device. Ensure that the socket outlet is located or installed near the equipment and is easily accessible. |
You can order an optional -48 VDC power supply for connection to DC power. The following sections describe how to wire the provided power 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 performing 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. |
The -48 VDC power supply includes a receptacle for a power connector. Wire the provided connector to the DC power source before plugging it into the power supply. For the DC power requirements, see the chassis back panel.
The following figure shows the wire locations for the DC power connector.
Wire the power connector 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 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 slot above the middle hole, and insert the frame ground wire into the middle hole.
Step 4 Remove the screwdriver.
The connector grips the wire securely.
Step 5 Repeat steps 2, 3, and 4 to insert the following wires:
Step 6 Externally fuse the -48 VDC power wire with a 4-amp (A) fuse.
Step 7 Plug the DC power connector into the bottom connector on the front of the chassis.
Step 8 Turn on the DC power source.
The -48 VDC power supply includes a receptacle for an alarm connector. If the power supply malfunctions, the system sends an alarm to an external alarm device. The alarm relay switch supports 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.
The following figure shows the wire locations for the alarm connector.
Wire the provided alarm connector as described in the following steps.
Do not strip more than 0.125 inches.
Step 2 Insert a medium flat-blade screwdriver into the connector slot above the second hole, and insert the Comm wire into the second hole from the left.
Step 3 Remove the screwdriver.
The connector grips the wire securely.
Step 4 Repeat steps 2 and 3 to insert the other wire:
Step 5 Plug the alarm connector into the top connector on the front of the chassis.
If you plug the alarm in before you connect the power, the alarm activates continuously. To avoid activating the alarm, plug in the power before plugging in the alarm.
The alarm activates in the event of a power interruption or a system failure. Push the Alarm Cut Off button on the front of the concentrator to reset the alarm.
If the system is still running despite alarm activation, it 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. Contact technical support.
Posted: Wed Sep 27 12:20:47 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.