Figure 246: Three-Phase Wye Ac Power Cord - Juniper MX2020 Hardware Manual

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blank panel. If you remove a PDM, you must install a replacement PDM or a
blank panel shortly after the removal.
NOTE: After powering off a PDM, wait at least 60 seconds before turning
the circuit breaker back on.
To remove a three-phase wye AC PDM:
Switch off the dedicated customer site circuit breakers to the PDM being remove.
1.
Make sure that the voltage across the AC power source cord is 0 V and that there is
no chance that the cord might become active during the removal process.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
Switch off ( O ) the AC PSMs and disengage all AC PSMs.
3.
Remove the ESD grounding strap from the ESD point on the chassis, and attach it to
4.
an approved site ESD grounding point. See instructions for your site.
Disconnect the AC power cord (see
5.

Figure 246: Three-Phase Wye AC Power Cord

Remove the ESD grounding strap from the approved site ESD grounding point. See
6.
the instructions for your site. Reconnect the strap to one of the ESD points on the
chassis.
Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the
7.
metal wiring compartment that protects the AC terminal block.
Remove the cover of the metal AC wiring compartment.
8.
Disconnect the wires from the AC terminal block on the three-phase delta AC PDM
9.
(see Figure 247 on page
screws, and remove each wire form the grounding point or input terminal.
Figure 246 on page
520), loosen each of the input terminals or grounding point
Chapter 25: Replacing Components
519) from the power source.
519