Technical data

6-2
Chassis Operations
6
Key Switch Control
A three-position key switch turns the power supply outputs on or
off. The | position is “on”; the position is “off” or Standby. The
key can be removed in either position to lock the switch in that
setting. If the key switch is in the | position when the system is
plugged in or power is restored, the power supply cycles on
immediately.
Note With the switch in the position, power to the card
cage is removed but the primary side of the power
supply remains energized.
Table 6-2. Dual 9-, 12-, and 20-Slot System Controls and Indicators
Control Location Function
Three-position
key switch
Front of enclosure,
upper left or right
Provides a convenient means of turning the
system power off (STANDBY) and on (RUN), or
of resetting the unit in the event of a
malfunction (RESET).
Removing the key locks the associated system
in its current state, either on or off.
System power
fault indicator
Above key
switch, right side
Illuminates when one of the power supplies in
a 12- or 20-slot chassis with two power supplies
fails.
Overtemperature
indicator
Above key
switch, left side
Illuminates in the event of excessive heat
buildup within the chassis.
Input power
indicator
Front of power
supply module
(not visible with
power supply
bezel installed)
Illuminates as long as the power supply is
connected to a -48Vdc or 115/230Vac input
power source.