Juniper MX2020 Hardware Manual page 356

MX2020 3D Universal Edge Router Hardware Guide
324
NOTE: After powering off a PDM, wait at least 60 seconds before turning
the circuit breaker back on.
NOTE: The PDMs are hot swappable in a redundant configuration. However,
you cannot switch from one type of PDU (AC or DC) to another while the
system is on.
Each three-phase delta AC PDM weighs approximately 12 lb (5.44 kg). To install a
three-phase delta AC PDM:
Make sure that the voltage across the AC power source cord is 0 V and that there is
1.
no chance that the cord might become active during the installation 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 ( ) the PSMs that are powered from only the AC PDMs being removed.
3. O
NOTE: After powering off a PDM, wait at least 60 seconds before turning
it back on.
Pull the locking levers on either side of the faceplate away until they stop.
4.
Using both hands, slide the PDM into the chassis until you feel resistance (see
5.
Figure 166 on page 325).
Push the lock levers completely in until they make contact with the PDM faceplate.
6.
Tighten the two captive screws on the locking levers of the PDM faceplate to secure
7.
the PDM in the chassis. Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of
torque to each screw. Do not overtighten the screws.
Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the
8.
metal wiring compartment that protects the AC terminal block.
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