Tait TB9100 User Manual

TB9100/P25 CG/P25 TAG Installation and Operation Manual Description 27
© Tait Limited March 2014
Power Management
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 base station 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. The
standby power supply card maintains 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. Refer to
“PMU Operation on DC Input” on page 129 for more detailed
information.
Auxiliary Power
Control
The output from the auxiliary power supply board can be used to power
other site equipment. The maximum output is 40W.
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 12V PA and yet
another if there is neither PMU nor PA.
Subracks with a
PMU
The subrack can receive input power from either the AC or DC input. The
PMU provides a 28V 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.

Tait TB9100 Specifications

General

Brand	Tait
Model	TB9100
Category	Accessories
Language	English