4. Using both hands, slide the power supply into the chassis until you feel resistance
(see Figure 20).
5. Twist the ejector handles at the upper corners of the power supply faceplate
clockwise until they stop.
6. Tighten the captive screws at the lower corners of the power supply faceplate
to secure the power supply in the chassis.
7. Verify that a licensed electrician has attached cable lugs to the power cables that
you supply.
8. Remove the clear plastic cover protecting the terminal studs on the faceplate.
9. Remove the nut and washer from each power terminal stud.
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.
10. Attach the lugs on the DC source power cables to the terminal studs.
a.
Attach the positive (+) DC source power cable lugs to the RETURN (return)
terminals.
b.
Attach the negative (–) DC source power cable lugs to the –48V (input)
terminals.
Secure the cable lugs to the terminal studs, first with a washer, then with a nut
(see Figure 19). Use a 7/16-in. (11-mm) nut driver to tighten the nut. Apply
between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
CAUTION: You must use an appropriate torque-controlled tool to tighten the nuts.
Applying excessive torque damages the terminal studs and the power supply. The
absolute maximum torque that may be applied to this nut is 45 in-lb (5.0 Nm).
Installing a T640 Four-Input 240-A DC Power Supply ■ 21
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