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TB9300 Installation and Operation Manual Description 33

1.8.5 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 34. Figure 1.10 on page 35 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’s

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.

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.

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.

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