User's Manual
Table Of Contents
- Installation and Operation Manual Draft in Progress
- Contents
- Preface
- 1 Description
- 2 General Safety and Regulatory Information
- 3 Operation
- 4 Working with Base Stations from Your PC
- 4.1 PC Recommendations
- 4.2 Connecting Your PC to the Base Station
- 4.3 Working with the Web Interface
- 4.4 Basic Tasks
- 4.4.1 User Settings
- 4.4.2 Taking the Base Station Offline
- 4.4.3 Troubleshooting Alarms
- 4.4.4 Working with Configuration Files
- 4.4.5 Configuring Single Base Stations
- 4.4.6 Configuring Base Stations in a Channel Group
- 4.4.7 Setting Up Custom Alarms
- 4.4.8 Disabling the Front Panel Keypad
- 4.4.9 Preparing to Download Firmware
- 5 Installation
- 6 Maintenance
- 7 Troubleshooting
- 8 Replacing Modules
- Appendix A – Interface Pin Allocations
- Appendix B – Inter-Module Connections
- TaitNet P25 Glossary
- Tait Software License Agreement
DRAFT 4
28 Description TB9400 Installation and Operation Manual
© Tait Electronics Limited September 2011
1.7.6 Front Panel Fans
The front panel is equipped with three fans. One fan is for the PMU and
the other two are for the reciter/PA pairs in a 50 W base station, or for the
PA and reciter in a 100 W base station. Front panel fans do not operate
continuously but are switched on and off as needed by the reciter firmware.
Each reciter controls the fan it shares with its PA, and reciter 1 also controls
the PMU fan. Under certain conditions the PMU and each PA can override
the reciter and assume control of its own fan.
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, as described in the following table:
PMU Temperature Fan Duty Cycle
<149 °F (65 °C) Increases as the load on the PMU
increases
149-167 °F (65-75 °C) On for two minutes, off for one minute
>167 °F (75 °C) Always on