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1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
one of the ESD points on the chassis. For more information about ESD, see the ACX2200 Universal
Metro Routers Hardware Guide.
2. Switch off the dedicated customer site circuit breakers. Ensure that the voltage across the DC power
source cable leads is 0 V and that there is no chance that the cable leads might become active during
installation.
3. Remove the clear plastic cover protecting the terminal on the faceplate.
4. Verify that the DC power cables are correctly labeled before making connections to the power supply.
In a typical power distribution scheme where the return is connected to chassis ground at the battery
plant, you can use a multimeter to verify the resistance of the –48V and return DC cables to chassis
ground:
For –48V and –60V:
a. The cable with very large resistance (indicating an open circuit) to chassis ground is the DC input
cable (–).
b. The cable with very low resistance (indicating a closed circuit) to chassis ground is the return cable
(+).
For +24V:
a. The cable with very low resistance (indicating a closed circuit) to chassis ground is the DC input
cable (–).
b. The cable with very large resistance (indicating an open circuit) to chassis ground is the return cable
(+).
5. Remove the screws and flat washers from the terminals.
6. Secure each power cable lug to the terminal with the flat washers and screw (see
Apply between 8 lb-in. (0.9 Nm) and 9 lb-in. (1.02 Nm) of torque to each screw. Do not overtighten
the screw. (Use a number 2 Phillips screwdriver.)
a. Secure the positive DC source power cable lug to the return (+) terminal.
b. Secure the negative DC source power cable lug to the input (–) terminal.
CAUTION:
terminal block as you are tightening the screws. Ensure that each screw is properly
threaded into the terminal. Applying installation torque to the screw when the
screw is improperly threaded may result in damage to the terminal.
Ensure that each power cable lug seats flush against the surface of the
Figure 9 on page
18).
17
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