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Connect Power to a DC Router

Table 1: MX5, MX10, MX40, and MX80 DC Power System Input Voltage

SpecificationItem

Operating range: –40 to –72 VDCDC input voltage

1. 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.

2. Switch the DC circuit breaker on the power supply faceplate to the off (O) position.

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 RTN DC cables to chassis ground:

•

The cable with very large resistance (indicating an open circuit) to chassis ground

is –48V.

•

The cable with very low resistance (indicating a closed circuit) to chassis ground is

RTN.

5. Remove the screws from the terminals.

6. Secure each power cable lug to the terminal with the screw (see Figure 10 on page 15).

Apply between 5 lb-in. (0.6 Nm) and 6 lb-in. (0.7 Nm) of torque to screw. Do not

overtighten the nut. (Use a number 2 Phillips screwdriver.)

a. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.

b. Secure the negative (–) DC source power cable lug to the –48V (input) terminal.

CAUTION: Ensure that each power cable lug seats flush against the surface

of the 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 improperly threaded may result in damage to the

terminal.

CAUTION: The maximum torque rating of the terminal screws on the DC

power supply is 6 lb-in. (0.7 Nm). The terminal screws may be damaged

if excessive torque is applied. Use only a torque-controlled driver to tighten

screws on the DC power supply terminals. Use an appropriately-sized

driver, with a maximum torque capacity of 6 lb-in. or less. Ensure that the

driver is undamaged and properly calibrated and that you have been

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Juniper MX5 User Manual

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