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Cisco ME 3400E Ethernet Access Switch Hardware Installation Guide
OL-16447-01
Chapter 3 Installing and Removing AC- and DC-Power-Supply Modules
Power-Supply Module Installation
Figure 3-12 Attaching the Ground Lug and Wire Assembly
Installing the DC-Power-Supply Module in the Switch
Step 1 Verify that power is off at the DC circuits. To ensure that power is removed from the DC circuits, locate
the circuit breakers for the DC circuits, switch the circuit breakers to the OFF position, and tape the
circuit-breaker switches in the OFF position.
Step 2 Insert the new power-supply module into the power-supply slot, and gently push it into the slot (see
Figure 3-13). When correctly inserted, the power supply is flush with the switch rear panel.
Figure 3-13 Inserting a DC-Power-Supply Module
Step 3 Align the two captive screws with the screw holes. Use a ratcheting torque screwdriver to torque each
screw to 7 in-lb.
Step 4 Set the DC-voltage selector (see Figure 3-14):
• For telecom applications (–36 to –72 VDC), set the DC-voltage selector to –48 VDC.
• For industrial applications (+18 to +36 VDC), set the DC-voltage selector to +24 VDC.
1 Dual-hole ground lug
280939
1
PSU OK +24V -48V
DC
PSU OK +24V -48V
DC
280826