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Cabling the Router for Power
After you have correctly cabled the modules and I/O modules, you must
attach grounding and electrical wires before you attempt system power-up.
Three main tasks are involved:
- Switch all router power switches to OFF.
 |
Caution: Switches may have inadvertently flipped to ON during shipping and installation.
|
- Connect the grounding wires to the chassis.
 |
Warning: Always connect the grounding wires first (before connecting the power
cables) and disconnect them last when installing or servicing the router.
|
- Connect the power cables (AC or DC) to the power input
modules.
See System Specifications for the power requirements for
ERX routers. Table 9 identifies the power input
module cabling requirements, and Figure 26 shows
the main components of a power input module.
Table 9: Power Input Module Cables and
Wires Needed
|
Cable/Wire
|
From
|
To
|
| ERX-14xx
models |
|
One 10-AWG ground wire
|
Power input module ground terminal
|
Termination ground
|
|
Two 8-AWG wire leads
|
Power input module Power A –48 VDC and RTN leads
|
Appropriate leads on power source No.1
|
|
Two 8-AWG wire leads
|
Power input module Power B –48 VDC and RTN leads
|
Appropriate leads on power source No.2
|
| ERX-7xx
models |
|
One 10-AWG ground wire
|
Power input module ground terminal
|
Termination ground
|
|
Two 12-AWG wire leads
|
Power input module Power A –48 VDC and RTN leads
|
Appropriate leads on power source No.1
|
|
Two 12-AWG wire leads
|
Power input module Power B –48 VDC and RTN leads
|
Appropriate leads on power source No.2
|
| ERX-310
router |
|
One 10-AWG ground wire
|
Power input module ground terminal
|
Termination ground
|
|
Two 14-AWG wire leads (DC model only)
|
Power input module Power A –48 VDC and RTN leads
|
Appropriate leads on power source No.1
|
|
Two 14-AWG wire leads (DC model only)
|
Power input module Power B –48 VDC and RTN leads
|
Appropriate leads on power source No.2
|
|
One AC power cord (AC model only)
|
Power input module AC power IEC receptacle
|
Appropriate AC power supply
|
Figure 26: Power Input Module for ERX-14xx Models
Task 1: Turn Off All Router Power
Before starting, you must switch all router power switches to OFF.
To turn off the router, push each power switch to the OFF position.
Task 2: Connect the Grounding Cables
All ERX routers have two grounding studs located in the rear of the
chassis, near the power inputs. Each stud provides grounding for a single
power unit.
To ground each power unit:
- Locate the grounding studs on the router (Figure 26 and Figure 27).
- Remove the nuts and locking washers from the grounding
studs.
 |
Note: We recommend a minimum of 10-AWG ground wire with a ring style terminal.
|
- Place the grounding cable lead on one of the grounding
studs and tighten the nuts to secure the connection.
- Connect the other end of the ground cable to the appropriate
ground termination lead.
- Repeat Steps 3–4 for the remaining grounding stud.
|
Note: When grounding an ERX router, leave a service loop in the grounding
cable to ensure that the grounding cable is the last cable to disconnect from
the shelf if strain is placed on the electrical cables.
|
Task 3: Connect the Power Cables
To connect power cables to the router, follow these steps. Refer to Figure 26, Figure 27, and Figure 28 as needed.
ERX-7xx Models, ERX-14xx Models, ERX-310
Router (DC Model)
|
Warning: Before you begin this procedure, ensure that all power switches are
in the OFF position.
|
- Be sure you have completed Task 1 and Task 2 in the
previous sections.
- If applicable, loosen the screws from the clear power input
module cover and remove it.
|
Warning: Be sure the power source is turned off, the router is turned off, and
proper grounding wires are attached before continuing with this procedure.
|
|
Warning: The wiring color code of the
power cables depends on the color coding of the DC power source installed
at your site. Color code standards for DC wiring do not exist. To ensure that
the correct polarity is connected to the router power units, confirm the connection
of the power cables to the + (positive) and – (negative) leads
at the power source.
|
- Remove the nuts and locking washers from the posts for
the power input (A or B) using a small insulated adjustable wrench.
- Place one negative (neutral) cable lead on the post labeled
–48 VDC.
- Replace the locking washers and nuts, and tighten the nuts
to secure the connection.
- Place the other cable lead on the post labeled RTN.
- Replace the locking washer and nut, and tighten the nut
to secure the connection.
- Attach the opposite end of Power A's wire leads to the
appropriate leads on your power source.
|
Note: To provide redundancy, do not terminate Power A and Power B leads at
the same power source.
|
- Place the clear plastic guard over the terminal posts,
and secure it in place by tightening the four screws.
- Repeat Steps 1–9 for each power input module in your
configuration.
Figure 27: ERX-310 Router, Rear View (DC Model)
ERX-310 Router (AC Model)
- Insert the power cord into the AC power IEC receptacle.
(See Figure 28.)
- Insert the other end of the power cord into an appropriate
AC power source.
|
Note: To provide redundancy, do not terminate Power A and Power B leads at
the same power source.
|
- Repeat Steps 1–2 for the other power input module,
if needed.
Figure 28: ERX-310 Router, Rear View (AC model)
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