DS Series PBX Technical Reference And Installation Guide
39
Technical Information:
SPS200 operates on 230 VAC from the mains input. Its alternative current input has been
designed so as it is not affected by variations within the range +/- %10. There are two T-Type
2A / 250 VAC fuses in the main fuse compartment as the first-step protection for the phase
and neuter lines.
The SPS200 AC/DC Power Supply has been connected to the 5-pin connector on the
BPL200-SPS Backplane and it has been screwed into the upper front part of the metal rack.
The SPS fixing screw must be loosened before the SPS casing is removed from the
exchange. It is not obligatory to use that screw after mounting, which has been included just
to provide safety during transportation.
The SPS200 AC/DC Power Supply contains a metal casing to which the SPS200CR Power
Card is connected. The mains transformer is located on the SPS200CR Power Card.
SPS200CR, which gets 230 VAC over mains, generates –54 VDC, which is the input voltage
to SPS248. Pin-outs for the SPS200 connector on the BPL200-SPS backplane are as
follows:
SPS200 – BPL200-SPS Connector
Pin no
Signal
1
- 54 VDC
2
ISOGND
3
-54 VDC
4
ISOGND
5
- VOUTREL
The DS200 system may be backed up with the 48 VDC battery support in order to maintain
operation in case of power failures. Hence, the necessary battery backup circuitry is present
on SPS200CR. Since the system does not include embedded power failure transfer stations,
battery backup is vitally important for maintaining connection of the system to the outer world
in case of power failure. Considering the battery connection in this regard, use of dry-type
batteries is strongly recommended in order to maintain proper operation of the system. A
battery connection of 48V/24 Ah is recommended for a full capacity, three-rack system with a
traffic rate of 35 % in average.
There is also an F-Type 8A/48VDC fuse on SPS200 for the battery input.
SPS200CR has the ability to charge the batteries even when the system power is on and the
system is operating with a low traffic rate. In addition to that, there is also a low current cut-
off circuit that turns itself off when the battery voltage drops below 42 VDC, and which is not
turned on until the voltage level rises above 48 VDC. Thanks to this circuit, SPS200 would
prolong life of the batteries by preventing their full discharge.
The counterpart of the SPS200 backplane connector (with 4 pins) is also located on the outer
side of the metal chassis on the back surface of the rack. Those connectors are also
supposed to be connected to one another during installation of systems with several racks,
with cables that come as attached to those connectors.
Summary of Contents for DS200
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