Procedure 8.24: ISLU FAN ALARM TESTS
OVERVIEW
CAUTION:
Any equipment that is taken out of service by these fuse/alarm tests must be allowed to recover before
proceeding with this procedure.
This procedure verifies that the major alarm condition caused by an inoperative fan in an ISLU drawer can be
detected and that the proper indications are given.
The following tests should be performed on
each
fan of each ISLU drawer. Testing each alarm in this procedure will
verify the hardware retire (reset button) and the software retire (input message).
Only one fan can be tested in the ISLU at a time. Each ISLU drawer contains three (3) fans (A, B, and C) and each
fan shares a fuse with one of the Line Groups (LG) in the drawer.
Table 8.24-1 indicates the ISLU Line Group fuse relationship. When you select an ISLU Line Group fuse, a fan in
the base of the drawer is also selected.
Table 8.24-1 ISLU Line Group Fuse/Fan Relationship
FAN
DRAWER
1
2
3
4
A
LG 3
LG 7
LG 11
LG 15
B
LG 2
LG 6
LG 10
LG 14
C
LG 1
LG 5
LG 9
LG 13
PROCEDURE
1.
At the master control center (MCC) terminal, ensure the alarm status is normal by typing and entering:
1010,x
.
Where:
x = SM number
2.
Select a single fan to test using Table 8.24-1 to determine the necessary information.
3.
Remove from service the Line Group of the fan to be tested by entering
RMV:ISLULGC=a-b-c,UCL;
Where:
a = SM number.
b = ISLU number
c = Line Group Controller number
Response:
RMV ISLULGC=a-b-c COMPLETED
4.
At the SM, unseat the Line Group circuit pack [KCD 3 or KCD 3(B)] for the related Line Group fuse being
tested.
5.
At the SM, remove the fuse associated with the ISLU Line Group fan.
Response:
(A) Audible MAJOR alarm gongs.
(B) After about 10 seconds, red LED at the rear of the ISLU drawer corresponding to fan
235-105-210
October 1999
Copyright © 1999
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