Replacing An Mx2020 Fan Tray; Removing An Mx2020 Fan Tray; Table 42: Connecting Alarm Relay Contacts - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
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Replacing an MX2020 Fan Tray

Removing an MX2020 Fan Tray

218

Table 42: Connecting Alarm Relay Contacts

Function No. Label
1
MINOR ALARM—[NC C NO]
MAJOR ALARM—[NC C NO]
Preventing Electrostatic Discharge Damage to an MX2020 Router on page 320
Disconnecting the Alarm Relay Wires from the MX2020 Craft Interface on page 215
Removing the MX2020 Craft Interface on page 215
Installing the MX2020 Craft Interface on page 216
MX2020 Craft Interface Description on page 33
MX2020 Craft Interface Serial Number Label on page 402
Removing an MX2020 Fan Tray on page 218
1.
Installing an MX2020 Fan Tray on page 220
2.
CAUTION: To prevent overheating, install the replacement fan tray
immediately after removing the existing fan tray.
To remove the upper or lower fan trays (see
page 219):
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Reposition the DC cable manager, if necessary, before removing the upper or lower
2.
fan tray:
Unwrap any cables on the DC cable manager, and remove the cables from the tray.
Arrange the cables so that they do not block the front of the cable manager and
tray, and secure them with temporary fasteners so that they are not supporting
their own weight as they hang from the connector.
Loosen the two captive screws on each side of the fan tray access panel and open.
3.
Loosen the two captive screws on the fan tray faceplate.
4.
While grasping the handle, press and hold the latch until the status LED turns off. Pull
5.
the fan tray out approximately 1 to 3 inches until it stops.
Description
The alarm relays consist of three
terminal contacts with a normal
closed (NC), common (C), and
normal open (NO) relays that
signal a minor or major alarm when
broken.
Figure 92 on page 219 and
Copyright © 2013, Juniper Networks, Inc.
Figure 93 on