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TB9400 Installation and Operation Manual

© Tait Limited March 2015

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 

 illustrates how these parameters interact, 

and how they control the operation of the PMU over a range of DC input 
voltages.

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 

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 

.

Notice 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 information on battery management, 
we recommend that you consult the battery manufacturer.

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.