Tait TB9400, Инструкция по установке и эксплуатации

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TB9400 Installation and Operation Manual
Description 31
© Tait International Limited November 2019
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 32 . Figure 1.9 on page 33 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 .
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.