Cisco Router 3600 Hardware Installation Manual page 83

Chapter 3 Installing the Router
Table 3-3 DC Wiring Requirements for Cisco 3660 Routers
Installed Power Supply
1
Nominal 24/48 VDC
Identified by a terminal block and the
following printed label:
24-36V
INPUT +/-
36-60V
2
Nominal 48 VDC
Identified by a plug connector and the
following printed label:
AC PS 100-240V~, 4-2A, 50/60 Hz
DC PS -48V to -60V
1. The input voltage tolerance limits for nominal 24/48-V power supplies are 18 and 72 VDC.
2. The input voltage tolerance limits for nominal 48-V power supplies are 38 and 72 VDC.
Wiring Procedure for DC Input
To connect the router to a DC power source, perform the following steps:
Remove power from the DC circuit. To ensure that power is removed from the DC circuit, locate the
Step 1
circuit breaker for the DC circuit, switch the circuit breaker to the OFF position, and tape the
circuit-breaker switch in the OFF position.
Tip Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.
Step 2 Cut the wires to length. Allow enough length for attachment to the bracket and for a service loop. (See
Figure
Strip the insulation to expose approximately 0.4 inch (10 mm) of conductor.
Step 3
If the power supply in your router has screw terminals, first connect the safety ground wire to the safety
Step 4
ground terminal of the DC terminal block, and then connect the power wires to the appropriate terminals
of the DC terminal block. (See
± 0.5 in-lb (0.93 ± 0.05 N-m).
The illustration shows the DC power supply terminal block. Wire the DC power supply as illustrated.
Warning
The proper wiring sequence is ground to ground, positive to positive, and negative to negative. The
ground wire should always be connected first and disconnected last. Statement 239
OL-2056-05
DC Input
24 - 36 V, 16 A AWG 12
36 - 60 V, 7 A
16A
7A
48 - 60 V, 8 A
, 8A
3-47.)
Figure 3-48
Wire Termination
Wire Size Method
Terminal block;
2
(3.0 mm ) wires retained by
retention screws
AWG 14 Terminal block;
2
(2.0 mm ), wires retained by
minimum retention screws
AWG 14 Plug connector;
2
(2.0 mm ), wires retained by
minimum spring-loaded
receptacle
or Figure 3-49.) Tighten the terminal screw to a torque of 8.0
Cisco 3600 Series Routers Hardware Installation Guide
Power Connections
Safety Ground Overcurrent
Wire Size Protection
AWG 12 20 A
2
(3.0 mm ) maximum
AWG 12 or 14 15 A
2
(3.0 or 2.0 mm ) maximum
AWG 12 or 14 15 A
2
(3.0 or 2.0 mm ) maximum
3-33