Karel DS200, Technical Reference And Installation Manual

Page: 159 / 222

DS Series PBX Technical Reference And Installation Guide
149
XIII.1.C. EXTERNAL RECTIFIER UNIT & REDUNDANT
SPS248 UNIT
Structure of the DS200 exchange allows it to be fed by external power supplies. A power
supply that is capable of supplying a steady output voltage of 56 VDC (at least 10 A) can be
employed for feeding the DS200 system externally. AN external rectifier unit can be used for
that purpose. By this way, need for including an SPS200 in each rack is avoided and two
SPS248 modules can be installed upon wish, in order to provide redundancy. (BPL200-
SPSX is supposed to be employed in racks.)
The connection between the external rectifier unit and DS200 can easily be made with a two
wire power cable. The DS200 connection point is the 4-pin connector located on the back of
the BLP200-SPS backplane. –56 VDC (the red wire) is connected to the first pin (the top pin)
and ground (the black wire) to the second pin.
Battery connection is made through the external rectifier.
As mentioned above, as for the cases where the exchange is fed by an external power
supply, the SPS248 DC/DC power supply module may be installed as a backup, upon wish.
For this purpose, first of all, the BPL200-SPS modules that are in the exchange racks are
supposed to be replaced by BPL200-SPSX modules. Following that change, the external
power supply is connected to the power connector that is in the main rack as explained
above and two SPS248 modules can be installed in each rack. By this way, if one of the
SPS248 modules in a rack goes out of order, then the second one avoids an interruption in
the rack’s functioning, thus it maintains uninterrupted operation of the exchange.
XIII.1.D. INTER-RACK POWER CABLING
In case a multi rack cabinet type system is to be installed, in order to increase the efficiency
of the power cabling between the racks, the 4-pin power connectors at the solder side of
BPL200-SPS and BPL200-SPSX backplanes must be connected to each other by a one to
one cable. It is recommended to use the supplies cables for this cabling.
The figure below illustrates the cabling for a three rack system.