User's Manual
Table Of Contents
- Installation and Operation Manual
- Contents
- Preface
- 1 Description
- 2 General Safety and Regulatory Information
- 3 Operation
- 4 Working with Base Stations from Your PC
- 5 Installation
- 6 Maintenance
- 7 Troubleshooting
- 8 Replacing Modules
- Appendix A – Interface Pin Allocations
- Appendix B – Inter-Module Connections
- Glossary
- Tait Software License Agreement
- Directive 1999/5/EC Declaration of Conformity
DRAFT 1
28 Description TB9300 Installation and Operation Manual
© Tait Limited May 2013
1.7.6 Front Panel Fans
The front panel is equipped with three fans. Fan 1 is for the reciters, fan 2
is for the PAs, and fan 3 is for the PMU. Front panel fans do not operate
continuously, but are switched on and off as needed by their associated
module. In a dual base station either PA or reciter can turn on its fan. The
reciter in slot 1can also carry out a fan test on all three fans.
Front panel fans are 3-wire fans (power, ground, and rotation detect). The
reciter can monitor whether the fans are rotating and generate an alarm if
the fan fails.
The fans turn on for a few seconds when the base station is powered up, and
also after the front panel is refitted to a base station which is powered up.
Configuring Fan
Control
The operation of the PA fan is configurable via the web interface; you can
specify the threshold temperature at which the fan will be turned on, and
set the fan to operate only when the PA is transmitting.
The PMU fan has fixed on/off thresholds and a defined set of duty cycles
based on the PMU temperature and load current, as described in the
following table.
PMU Temperature Current Fan Duty Cycle
<149°F (65°C) <4A
4A–6A
6A–8A
8A–12A
12A–14A
≥15A
always off
2 minutes on, 8 minutes off
2 minutes on, 5 minutes off
3 minutes on, 3 minutes off
4 minutes on, 1 minute off
always on
149–167°F (65–75°C) –– two minutes on, one minute off
>167°F (75°C) –– always on