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Connecting the JSA7800 to Power

Connecting the JSA7800 Appliance to Ground

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must adequately ground the JSA7800 appliance before connecting it to the power source.

Grounding for the JSA7800 appliance is provided through the power supply ground. Ensure that you connect the AC power supply module in the appliance to a grounded AC power outlet by using an AC power cord (with the grounding pin) appropriate for your geographical location.

Note:

A ground connection to the protective earthing terminal is not required for an AC-powered JSA7800. The AC power cords provide adequate grounding when you plug the power supply in the switch into a grounded AC power outlet by using the AC power cord appropriate for your geographical location.

Connecting the JSA7800 Appliance to a DC Power Source

Before connecting your JSA7800 appliance to a DC power source:

  • Ensure that you have taken the necessary precautions to prevent ESD damage.

  • Ensure that you have connected the JSA7800 appliance chassis to earth ground.

Required tools and parts:

  • DC power source cables (12-14 AWG) with ends of the wire stripped ~12 mm and twisted

  • Phillips (+) screwdriver, number 1

CAUTION:

Before you connect power to the JSA7800 appliance, attach the ground wire in one of the below configurations to meet the safety requirements and to ensure proper operation:

  • Both power supply ground terminals

  • One or both of the chassis ground terminal(s) located to the left of the power supply modules

  • Both power supply ground terminals and one or both chassis ground terminals

You connect a DC power source to the JSA7800 appliance by attaching power cables from the external DC power sources to the terminal studs on the DC power feed faceplates.

Warning:

DC-powered JSA appliances are intended for installation only in restricted access locations.

Warning:

Before you perform the following procedure, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position.

To connect the DC source power to the JSA7800 appliance:

  1. Ensure that the input circuit breaker is open so that the voltage across the DC power source cable leads is 0 V, and so that the cable leads will not become active while you are connecting DC power.
  2. Connect the black wire to the -48 V terminal block and red wire to the RTN terminal block on the back panel of the JSA7800 appliance.
  3. Use the terminal screws to secure the power source cables to the power feed on the JSA7800 appliance.
  4. Attach the plastic safety cover.