Reattach DC Power Cables and Apply Power to the Modular System (DC)

By default, as soon as the chassis power supplies receive power, main power is applied to all installed components. There is no main power on/off switch on the chassis. Apply power only when you are ready for the modular system to fully initialize.

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Caution - The DC power source must be located in the same premises as the DC modular system. The power source cannot be in one building with the modular system in another building. This restriction minimizes the possibility of transient energy appearing on the main DC input to the modular system.

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Caution - A power disconnect device is not incorporated with the equipment. You must incorporate an external, readily accessible disconnect device to the equipment.

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Caution - This product does not provide branch circuit overcurrent protection as defined by the US NEC (United States National Electrical Code), Article 100. Installations of this product in compliance with the US NEC must be on branch circuits with overcurrent protection as defined by Article 480.3 of the US NEC. Product power inputs with current ratings 16A or less must have a branch circuit or supplementary overcurrent protection device rated at no more than 20A. Product power inputs with current ratings of more than 16A must have a branch circuit or supplementary overcurrent protection device rated at no more than 160% of the product input current rating. Other national and/or local electrical codes might apply to the installation of this product.

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1. Ensure that the circuit breakers on your power source are open or that the fuses are removed.

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   Caution - To prevent electrical shock, ensure that no power is present on the circuits to which you are connecting.

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2. Use a nut and washer to fit the lug to the electrical grounding terminal on the rear of the system chassis.
   
   

   No. Description 1 Chassis DC grounding terminal

3. Use the nuts and washers to secure the lugs to the DC input unit terminals.

   Attach the black wires to the positive terminals. Attach the white wires to the negative terminals. See Modular System Installation, DC power cable wiring..

   
   
   

   No. Description 1 Chassis ground terminal 2 Neutral terminals (white wires) 3 -48 or -60 VDC hot terminals (black wires)

4. Verify all DC connections before applying power.
5. Replace the safety cover on the rear of the DC input unit.

   Tighten the green captive screws.

   
   
6. Apply power to the chassis by closing the circuit breakers or installing the fuses.

   Main power is automatically distributed to the modular system.

7. Verify the chassis initialization by viewing the front or rear status LEDs.

   • Green OK LEDs – Illuminate a solid green light, indicating successful initialization.

   • Amber fault LED – Illuminates if a fault is detected. If the amber fault LED is illuminated, check for other fault indicators on modular components, unplug the chassis, and take corrective actions. See Monitoring Faults.

   
   
8. Start the CMM

   See Start the CMM (CLI).

Related Information

• Start the CMM (CLI)

• Verify Modular System Functionality