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
TB9400 Installation and Operation Manual Description 25
© Tait Electronics Limited September 2011
1.7.5 PMU Operation on DC Input
The operation of the PMU on DC input is controlled by three sets of
parameters:
■ user-programmable alarms
■ user-programmable startup and shutdown limits
■ battery protection limits
The voltage range for each of these parameters is provided in Table 1.1 on
page 26. Figure 1.9 on page 27 illustrates how these parameters interact, and
how they control the operation of the PMU over a range of DC input
voltages.
Alarms User-programmable alarms can be set for low or high battery voltage
(Configure > Alarms > Thresholds). The alarms will be triggered when the
set voltage levels are reached. These limits are subject to the tolerances of the
battery protection circuitry, as stated in “Battery Protection (Fail-safe)
Limits” in Table 1.1.
Startup and
Shutdown Limits
The user-programmable startup and shutdown limits allow for adjustable
startup and shutdown voltages (Configure > Base Station > Miscellaneous).
These limits can be adjusted for different numbers of battery cells, or for the
particular requirements of the base station operation. Once the limits are
reached, the PMU will shut down. These limits are subject to the tolerances
of the battery protection circuitry, as stated in “Battery Protection (Fail-safe)
Limits” in Table 1.1.
Important It is possible to set the startup voltage of the base station
below the nominal voltage of the battery. Continuing to use
a battery for extended periods when it is below its nominal
voltage will severely shorten its service life. For more infor
-
mation on battery management, we recommend that you
consult the battery manufacturer.
Battery Protection
Limits
The battery protection limits are set in hardware at the factory, and cannot
be adjusted by the user. These limits will not be reached under normal
operation conditions, but are provided as “fail-safe” measures to protect the
battery from deep discharge. They also remove the need for low-voltage
disconnect modules.