CABINET (Cabinet Sensors)
Issue 4 May 2002
10-333 555-233-123
1 FAIL The AHD1 circuit pack has reported an air flow problem. The
temperature difference between the air intake and the air
exhaust is at least 15
0
C (59
0
F) and the absolute
temperature at the top of the cabinet is at least 50
0
C (122
0
F)
(referred to as the 15
0
C/50
0
C criteria). The fans should be
running at high speed.
1. If none of the fans are running, then:
a. Look for and resolve all alarms against the
CARR-POW (Carrier Port Power Unit).
b. Verify -48 volt DC power is available to the fan units.
Check the fan unit wiring harness connector. Check
that there is 48 volt DC between pins 3, 9, 11 and 2, 8,
10.
■ If there is -48 volt DC power at the connector, there
should be power to the fans. If the fans are not
running, replace the AHD1. If the fans still do not run,
escalate the problem.
■ If there is no -48 volt DC power at the connector, then
the current limiter card (982LS) is probably defective.
Replace the current limiter card. If the fans still do not
run, escalate the problem.
2. If only a few of the fans are not running, replace the
defective fans.
3. If all the fans can be started, wait five minutes and rerun
the test. If the test fails again, proceed to Step 4 or 5 as
applicable.
Table 10-129. TEST #122 Cabinet Temperature Query Test
[Non-Variable Speed Fans] — Continued
Error
Code
Te s t
Result Description/Recommendation
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