ADTRAN Total Access 1240 - Manual (Page 30)

Total Access 1240 Installation and Maintenance Practice
3-8 61179605L5-5B
Fans/Fan Filter
The Total Access 1240 is shipped with a pre-installed fan module (P/N 1179672L1). The fan
module is located on the right side of the unit and contains two fans (
Figure 3-6 ). The fans
move filtered air (if the filter is installed) into the Total Access 1240 chassis and out through
the exhaust slots on the left side of the chassis.
The fans are monitored by the Total Access 1240 system and are tested during power-up or
when a fan module is installed. If any fan fails, the
POWER
LED turns red, indicating a self-
test failure, and a minor alarm is generates indicating the problem. The fan alarm can be
suppressed using the fan alarm delay for replacement or maintenance of the fan module.
The fans are thermostatically controlled and operate only when necessary. One fan is
activated first and alternates with the other fan to maintain a specified temperature level. If
the temperature continues to rise, both fans operate at the same time. In the event the
temperature remains high, the SHDSL circuits shut down until a safe operating temperature
is reached.
The fan module and fan filter can be replaced in the field.
Figure 3-6. Fan Module
FA
N MODULE
1179672L1
FAN MODULE
1179672L1