Tait P25 CG, Инструкция по установке и эксплуатации

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24 Description TB9100/P25 CG Installation and Operation Manual
© Tait Electronics Limited January 2007
Power Management
TB9100 base stations with a PMU manage the supply of power to ensure
uninterrupted operation of the base station. A range of parameters is
monitored and can trigger alarms that are sent via the reciter to the CSS and
a syslog collector.
AC to DC
Changeover
When the PMU has an AC and a DC module, the TB9100 can be powered
by either the AC (mains) or the DC (battery) supply. The base station will
default to the AC supply if both supplies are provided. If the AC supply
becomes unavailable, a seamless changeover from the AC to DC supply takes
place, providing that the battery voltage is above the configured minimum.
You can use the CSS to monitor whether the base station is running on
battery or mains power.
DC Operation
When the base station is running off the DC supply and the battery voltage
falls below the configured minimum, the base station will enter PMU
Shutdown mode to protect the battery and base station equipment. A
standby power supply card is required to maintain the power to the PMU
microprocessor, while the rest of the PMU is shut down.
When the battery voltage rises to the configured startup setting, power is
resumed to the DC supply.
Auxiliary Power
Control
If the PMU is fitted with an auxiliary power supply unit, its output can be
used to power other site equipment or to recharge the DC battery supply
when the base station is running off the AC supply. You will need to
configure it to suit your requirements.
Power Distribution
Figure 1.6 shows how power is distributed to modules in the subrack. One
method is used if there is a PMU, another if there is a 12 V PA and yet
another if there is neither PMU nor PA.
Subracks with a
PMU
The TB9100 can receive input power from either the AC or DC input. The
PMU provides a 28 V output to the PA and to the reciters. Internal seamless
switching between the AC or DC input ensures there are no power
interruptions should a changeover occur between the two inputs. The base
station will default to the AC input if both AC and DC inputs are provided.
The AC converter has a series switch which isolates the mains input from
the converter. The DC input, however, has much higher current ratings, and
supports an on/off switch on the converter only.
The outputs from both the AC and DC high power converters are added
together and fed to the PA via the PA1 and PA2 outputs. The auxiliary
output is also tapped off this summed output.