•
Install the power supply in the chassis.
Ensure that you have the following parts and tools available. Also, the grounding cable must be 14 AWG
(2 mm²), minimum 90° C wire, or as permitted by the local code.
•
Grounding lug for your grounding cable—The grounding lug required is a Panduit LCD10-10A-L or
equivalent.
•
• Two M4 HEX nuts with integrated washers—Two nuts and washers are used to secure the grounding
lug to the grounding lug bracket protective earthing terminal. Four nuts are provided in the accessory
kit.
•
• 7-mm wrench or a socket with driver to attach the two nuts.
To connect DC power to a EX4650:
1. Attach the grounding strap to your bare wrist and to a site ESD point.
2. 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 low resistance (indicating a closed circuit) to chassis ground is positive (+) and
will be installed on the V+ (return) DC power input terminal.
•
The cable with very high resistance (indicating an open circuit) to chassis ground is negative (–) and
will be installed on the V– (input) DC power input terminal.
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 DC power input terminals on each power supply.
3. Ensure that the input circuit breaker is open so that the voltage across the DC power source cable
leads is 0 V and that the cable leads do not become active while you are connecting DC power.
NOTE: The V+ terminals are referred to as +RTN, and V– terminals are referred to as –48 V in
“DC Power Wiring Sequence Warning” on page 186 and “DC Power Electrical Safety Guidelines”
on page 181.
91
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