Nortel Networks 8010co Front panel, Shelf circuit breakers upper and lower shelves, Overview

20Chapter 1 Overview

Front panel

Figure 2 shows the BIP front panel components.

Figure 2 Front panel components

1 2 3

Alarm Module

Upper Shelf Lower Shelf

POWER

CRITICAL

MAJOR

MINOR

1

2

3

1 2 3

1 = Shelf circuit breakers (upper/lower shelves)

2 = Alarm module display panel

3 = Front-panel locking screws (x2)

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Shelf circuit breakers (upper and lower shelves)

Two groups of three circuit breakers provide input power to the power supplies for the upper and lower shelf 8010co chassis (Figure 3 on page 21):

•The first group, labeled “Upper Shelf,” provides input power to the upper shelf power supplies.

•The second group, labeled “Lower Shelf,” provides input power to the lower shelf power supplies.

If a power supply over current condition occurs, the associated circuit breaker trips and indicates the fault by lighting the associated circuit breaker’s LED (red).

Each of the six circuit breakers is current limited to 30 amperes @80 volts direct current. The circuit breakers are designed with internal auxiliary switches to provide fault indications to the alarm module and to the associated circuit breaker LEDs on the front panel. The alarm module reports circuit breaker fault conditions by lighting the MAJOR indicator on the Alarm Module display panel.

No alarm is generated to the alarm module when the circuit breaker is manually switched on () or off (O).

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