Juniper PTX3000 Quick Start Manual page 29

10. Connect the positive (+) DC source power cables to input 1 and input 2 RTN (return) input terminals
(Figure 23 on page 30
CAUTION:
derived from feed A, and the other input on each PSM must be powered by dedicated
power feeds derived from feed B.
This configuration provides the commonly deployed A/B feed redundancy for the
system. For example, you can connect input 1 on each DC PSM to feed A, and input
2 on each DC PSM to feed B.
CAUTION:
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.
Secure the positive (+) DC source power cable lugs to the RTN (return) terminals with a nut for each
terminal. Use a 10-mm nut driver to tighten the nuts.
CAUTION:
Applying excessive torque damages the terminal studs and power supply. The maximum
torque that may be applied to this nut is 24.0 lb-in. (2.7 Nm).
and Figure 24 on page 30).
One input on each DC PSM must be powered by dedicated power feeds
You must ensure that power connections maintain the proper polarity.
You must use an appropriate torque-controlled tool to tighten the nuts.
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