1-54 Trouble locating and clearing procedures (continued)
297-8021-544 Standard 14.02 May 2001
Repairing and replacing NT3X90AA cooling units
(continued)
Repairing and replacing NT3X90AA cooling units
At the FSP
1
Identify the frame, or the pair of frames, where the lit FAN FAIL lamp is on the
Frame Supervisory Panel (FSP).
Note: NT3X90AA power supplies for the cooling unit connect in pairs. A
problem in one unit on a pair can cause an interruption in the operation of
both units of the pair. Frames that are near each other will house the pairs.
2
To silence the alarm, turn ON the FAN FAIL OVERRIDE switch (or switches).
At the frame
3
Remove the air intake grill and filter assembly from the front of the affected
cooling unit.
4
Determine if the FAN FAIL lamp darkened on the Frame Supervisory Panel
(FSP) when you removed the filter.
5
Remove the filter and intake grill to a location away from the switchroom. To
clean the fan air intake, use a dust cloth and vacuum.
6
Vacuum or wash the filter in soap and water, according to the filter type.
7
Replace the filter in the grill and reinstall the grill at the front of the cooling unit.
8
Turn OFF the FAN FAIL OVERRIDE switch.
Go to step vr.
ATTENTION
The cooling unit configuration in the frame can differ from the following
description. If you encounter an important difference, contact your next level
of support.
If the lit FAN FAIL lamp
Do
is on only one frame
step 3
is on two frames
step 39
If the FAN FAIL lamp
Do
darkened
step 5
remained on
step 8
If your company procedures
Do
direct you to do repairs
step 9