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Chapter 2: Installation December 20, 2004
2-12 LTPH-UM-1261-01
Optional Fan Alarm Procedure
Figure 2-3. Alarms Wire-wrap Field (TB2)
Note: The FAN terminals wire-wrap field provides access to the Normally Open (NO), Form A fan relay
contact located on the HMU-319 management unit. A temperature monitor activates this fan relay when the
shelf temperature exceeds 45°C (±1°C) and deactivates the relay when the temperature drops below 35°C
(±1°C). If the temperature exceeds 77°C (±1°C) a critical alarm is also generated. The critical alarm resets
when the temperature drops below 40°C (±1°C).
Step Action
1 Connect the optional fan inputs to the Alarms wire-wrap field pins 25 and 26 (see Figure 2-3).
NC C NO
CRIT AUD
CRIT VIS
MAJ AUD
MAJ VIS
MIN AUD
MIN VIS
SYS ID
ACO
123
4
5
6
7
89
10 11 12
13 14 15
16 17 18
19 20 21
22
0
6
-
1
2
6
1
R
1
ALARMS
23 24
GND
EXT
TEMP
25 26
NO COM
FAN