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.
Figure 7: Disconnecting Power Cables from the DC Power Supply
6. Remove the cable lugs from the terminal studs.
7. Loosen the captive screw or screws on the cable restraint on the right edge of
the power supply faceplate.
8. Carefully move the power cables out of the way.
9. Loosen the captive screws on the lower corners of the power supply faceplate
completely.
10. Twist the ejector handles on the upper corners of the faceplate counterclockwise
to unseat the power supply.
11. Grasp the handle on the power supply faceplate and pull firmly. Slide it halfway
out of the chassis (see Figure 9).
12. Place one hand underneath the power supply to support it, and slide it completely
out of the chassis.
Removing a T640 Three-Input 240-A Power Supply ■ 9
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