CABINET (Cabinet Sensors)
Issue 1 May 2002
8-389555-233-143
1FAILVARIABLE-SPEED FAN ASSEMBLIES: One or more fans have stopped. If
none of the fans are running:
1. Resolve every alarm against ‘‘CARR-POW (Carrier Power Supply)’’.
2. Verify that 48 VDC is available to the fan power filter at the J2F local cable
connector. The voltage range is -42.5 V to -52.5 V. There should be 48
VDC between the following pin pairs: 2/3, 8/9, 10/11. If -48 VDC is
absent, replace the CFY1B current limiter card.
3. If there are 48 VDC at the power filter’s input, exactly follow this procedure
to verify that there are also 48 VDC at the power filter’s output — to avoid
damage to the fan alarm circuit. (Note that the J2F/P2F connectors on the
power filter must be disconnected whenever connecting or disconnecting
the J2/P2 connectors on the fan assembly.)
a. Disconnect connector J2F from P2F on the top of the filter.
b. Disconnect J2 from P2 on the fan assembly.
c. Reconnect J2F to P2F on the filter. (There should be 48 VDC between
the following pin pairs on the J2 connector: 2/3, 8/9, 10/11.)
d. If 48 VDC is present, the fans should have power. Make sure every
power connector is sound and making good contact. (Be sure to
disconnect the J2F/P2F connector again before reconnecting the
J2/P2.)
e. If not, replace the fan power filter using the previous procedure
described. (Be sure to disconnect the J2F/P2F connector again before
reconnecting the J2/P2.)
1
(cont’d)
FAIL
(cont’d)
If some of the fans are running and some are not:
1. Replace the defective fans. If every fan can then be started, wait 5
minutes and rerun the test. If the test fails again, proceed to the next step.
2. Remove all 6 white 5-pin connectors on the front and back of the fan
assembly. This will cause every fan to run at high speed and the alarm to
be cleared. If the alarm does not clear, an EPN’s Maintenance circuit
pack is incorrectly reporting the problem. Check for and resolve every
error against MAINT, and then rerun the test.
3. One at a time, replace the 5-pin connectors and check to see if the alarm
recurs. Replace each fan whose reconnection causes a recurrence of the
alarm.
Table 8-162. Test #122 Cabinet Temperature Query Test — Continued
Error
Code
Te s t
Result Description / Recommendation
Continued on next page
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