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Connect Power to a DC-Powered Services Gateway

Warning: The device must be properly grounded before you connect the DC power cables.

Table 4: DC Power System Input Voltage

Item

Specification

DC input voltage

Operating range: –40 to –72 VDC

Figure 10: Connect DC Power Cables

Image g004038.gif

Caution: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.

  1. 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. 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 SRX 5800 Services Gateway Hardware Guide.
  3. For each power supply:
    1. Switch the circuit breaker on the power supply faceplate to the OFF position (O).
    2. Remove the clear plastic cover protecting the terminal studs on the faceplate.
    3. Attach the positive (+) DC source power cable lug to the RTN (return) terminal.
    4. Secure the power cable lugs to the terminal studs on the power supply, first with the split washer, then with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque.
    5. Attach the negative (–) DC source power cable lug to the –48V (input) terminal.
    6. Secure the power cable lugs to the terminal studs on the power supply, first with the split washer, then with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque.
    7. Replace the clear plastic cover over the terminal studs on the faceplate.
  4. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to an approved site ESD grounding point. See the instructions for your site.
  5. Connect each DC power cable to the appropriate external DC power source.

    Note: For information about connecting to external DC power sources, see the instructions for your site.

  6. Switch on the external circuit breakers to provide voltage to the DC power source cable leads.
  7. Switch on the circuit breakers on each power supply to the ON position (|). Observe the status LEDs on each power supply faceplate. If a DC power supply is correctly installed and functioning normally, the PWR OK, BRKR ON, and INPUT OK LEDs light green steadily.

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