Description Of Operation - Unipower Bluestrak Series Operating Manual

P O W E R I N G T E C H N O L O G Y
9.0

DESCRIPTION OF OPERATION

9.1 Power Outputs
The power output terminals provide the main output power of the unit. The output voltage
is adjustable by means of the front panel recessed push buttons or by programming with the
PMBus or by using the analogue remote adjust pin. Note that all of the power pins must
be used for correct operation and to avoid overheating of the connector. The power output
terminals are isolated from chassis ground to a maximum voltage of 2000Vdc.
9.2 I/O Signals
The # symbol in the following text is used to denote an active low signal.
9.2.1
The sense signals are intended to be connected to the point of load so that voltage drop in
the load cables can be compensated for. The amount of compensation is limited to 0.25V
per wire. Care must be taken when using the sense signals as if the power connections to
the load are interrupted by disconnection or circuit breaker with the senses still connected
then damage may occur to the power supply and sense wiring. Sense +Ve and Sense -Ve
are internally connected to the module output power terminals using 10 Ohm resistors so
that if the senses are not connected the output will still be regulated.
Sense -Ve is also used as the return path for some of the other I/O signals.
9.2.2
This signal is connected between all modules required to share a load. This signal is capable
of driving up to 16 modules. The return path for this signal is Sense -Ve and that signal
should also be connected between all modules for correct sharing operation.
9.2.3
This analogue signal provides a voltage proportional to the output load current of the module.
The return path for this signal is Sense -Ve. The full scale voltage for nominal full load
current is 3.0V.
9.2.4
This is the return path for many of the module signals. It and the associated signals are
isolated from the main power outputs with isolation voltage of up to 100Vdc. It is also
isolated from chassis ground up to 2000Vdc.
9.2.5
This signal can be used to adjust the output voltage. The return path for this signal is Sense
-Ve.
The characteristic of remote adjust varies for different BLUEstreak models. The table below
shows the typical characteristic for a TBSR7000 model which has its default output set to
48.00V.
Document Number: BLUESTREAK-MAN Rev. 6
Sense +Ve, Sense –Ve
Current Share
Current Monitor
Standby Return
Remote Adjust
INSTALLATION & OPERATING MANUAL
Page 9
BLUESTREAK SERIES
bluestreak-man-rev6-0719.indd