User's Manual

16 Connection TB8100 Installation Guide
© Tait Electronics Limited June 2005
2 Connection
2.1 Auxiliary Power Supply Connections
PMU Auxiliary DC
Output
The PMU can provide an auxiliary DC output when it is fitted with the
optional auxiliary power supply board. This board is available with an
output of 13.65VDC, 27.3VDC, or 54.6VDC (depending on the model),
and is current limited to 3A, 1.5A or 750mA respectively. This optional
power supply is available on the auxiliary DC output connector
b on the
rear panel. DC from this output can be supplied to the +AUX_V pin on
the system interface connector
c on the reciter via the auxiliary DC input
connector
d on the system interface board (see “Reciter Auxiliary DC
Input from PMU” on page 18). The auxiliary DC power cables
e are
described in “Power Supply Connections” in the Installation and Operation
Manual.
The auxiliary power supply is configured with the Service Kit (Configure >
Base Station > Miscellaneous > Power configuration > Auxiliary power
control). Its operation can be controlled by Task Manager statements, for
example:
IF Digital input 01 active THEN Enable auxiliary supply.
Refer to the Service Kit documentation for more details.
We do not recommend connecting two or more auxiliary power supply
boards in parallel to increase the current supply to external equipment. In
this situation, the auxiliary board with the highest voltage will try to supply
all the current required, until it goes into current limit and the voltage
reduces to the level where another board will begin to supply power.
Running an auxiliary board continuously in current limit will reduce its life
span and reliability. Also, if one auxiliary board fails or is switched off when
a base station is powered down for some reason, the remaining auxiliary
boards will be unable to supply the required current and will go into current
limit, possibly causing the external equipment to shut down.
Figure 2.1 Auxiliary DC power supply connections
b
c
d
e