Juniper MX2020 Hardware Manual page 326

MX2020 3D Universal Edge Router Hardware Guide
294
WARNING: The AC PSMs have no circuit breakers that can physically
disconnect AC current from the router. After AC feeds have been connected
to the PDM, the AC voltage is always present on the power midplane and is
distributed to the PSM connectors on the power midplane.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the
operating PSM, each PSM slot must contain either a PSM or a blank panel.
If you remove a PSM, you must install a replacement PSM or a blank panel
shortly after the removal.
NOTE: After powering on a PSM, wait at least 60 seconds before turning it
back off.
To install an AC PSM (see
With one PSM installed and operational, install an additional PSM with the power
1.
supply switch in the off (
WARNING: If there is only one PSM installed and operational, the power
supply switch must be placed in the off (
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.
While grasping the handle on the PSM faceplate with one hand, use your other hand
3.
to guide the power supply module into the chassis.
Tighten the captive screws on the PSM faceplate.
4.
Turn on the power switch to the on (
5.
Verify that the PWR OK
6.
Figure 145 on page 295):
O ), or in the on ( | ) position.
) position.
|
LED is lit steadily green.
) position.
O
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