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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-235CABINET (Cabinet Sensors)
10
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 (27
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 10-71. TEST #122 Cabinet Temperature Query Test [Non-Variable
Speed Fans] — Continued
Error
Code
Test
Result Description/ Recommendation
Continued on next page