3Com 3CB9E7 - CoreBuilder 9000 Chassis Switch, Getting Started Manual

Page: 68 / 132

68 C
HAPTER
7: M
AINTENANCE FOR THE
7-S
LOT
C
HASSIS
Removing a –48-volt DC Power Supply
The CoreBuilder 9000 Enterprise Switch 7-slot chassis
can accommodate up to two –48-volt DC power
supplies.
To remove a –48-volt DC power supply from a 7-slot
chassis:
1 Set the power supply’s Standby/On switch (Figure 28),
which is located on the side of the power supply, to
the Standby position.
Figure 28
–48-volt
DC Power Supply Standby/On Switch
2 To protect the power supply that you want to remove,
turn off the building’s power source circuit breaker.
3 Remove each wire from the DC power source
electrical outlet.
4
Remove the 8 AWG wires from DC input connector
on the –48-volt DC power supply.
a
Label the polarity of both ends of each wire
(Figure 29).
Figure 29 Label Each 8 AWG Gauge Wire
b Loosen the three wires with a slotted-blade
screwdriver.
c
Gently pull the three wires out of the DC input
connector.
d Place the wires aside until you are ready to connect
them again.
INPUT RA
TING
-48
V /27A
ST
ANDBY
ON
-48V 0V
ST
ANDBY
ON
Standby/On
switch
On position
Standby position
-48-volt DC
Protective
earth ground
0V
(zero volt)