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CABINET (Cabinet Sensors)
Issue 1 June 2005 767
S8700 |
8710
S8500:1
(cont’d)
FAIL
(
cont’d)
NONVARIABLE-SPEEDFAN ASSEMBLIES (older or upgraded cabinets):
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). The fans should be running at high speed. If none of the
fans are running then:
1. Look for an resolve every alarm against CARR-POW.
S8700 IP Look for an resolve every alarm against RMC-ENV.
2. Verify that 48 VDC is available to the fan wiring harness connector
between pin pairs 2/3, 8/9, and 10/11. The tolerable range for this
measurement is -42.5 V to -52.5 V.
If 48 VDC is present and the fans are not running, replace the AHD1
circuit pack.
3. If the fans still do not run, escalate the problem.
4. If 48 VDC is absent, replace the CFY1B current limiter card.
If the fans still do not run, escalate the problem.
If some fans are running and some not, replace the defective fans.
5. If every fan can then be started, wait 5 minutes, and rerun the test. If
the test fails again, proceed to the next step.
6. If every fan is running but not at high speed, measure the cabinet
temperature at the air intake and the air exhaust at the top of the
cabinet.
a. If the 15
0
-/50
0
-C criteria is met, there is a problem with the AHD1
circuit pack or the fans. Replace the AHD1 circuit pack and/or fans.
If the fans run at high speed, wait 5 minutes for the cabinet to cool,
then retest. If the test fails, escalate the problem.
b. If the 15
0
-/50
0
-C criteria is not met, then environmental maintenance
is incorrectly reporting this condition. Resolve every error (
S8700
MC
: MAINT) and retest. If the test fails, escalate the problem.
Table 264: Test #122 Cabinet Temperature Query Test (continued)
Error
Code
Test
Result
Description / Recommendation
5 of 7