Figure 200: Attaching The Dc Power Cable - Juniper T640 Hardware Manual

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Secure the cable lugs to the terminal studs, first with a washer, then with a nut (see
Figure 200 on page 385). 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 lb-in. (5.0 Nm).

Figure 200: Attaching the DC Power Cable

Cable lug
Locking
washer
Nut
Loosen the captive screws on the cable restraint on the right edge of the power supply
10.
faceplate.
Route the DC power cables through the cable restraint.
11.
Tighten the cable restraint captive screws to hold the power cables in place.
12.
Verify that the power cabling is correct, that the power cables do not touch or block
13.
access to other hardware components, and that they do not drape where people
could trip on them.
Replace the clear plastic cover over the terminal studs on the faceplate.
14.
Switch on the customer site circuit breakers to provide voltage to the DC power source
15.
cables.
Verify that the
INPUT PRESENT
16.
indicating that the inputs are receiving power.
Switch the power switch on the power supply to the
17.
blinks momentarily, then lights steadily.
Chapter 29: Replacing Power System Components
Terminal studs
LEDs on the power supply faceplate are lit steadily,
ON
position ( ). The LED
| DC OK
385