Karel DS200, Technical Reference And Installation Manual

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DS Series PBX Technical Reference And Installation Guide
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Technical Information:
SPS200M operates on 230 VAC from the mains. 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 SPS200M Power Supply has been connected to the 10-pin connector on the BPL200S-
SPS Backplane and it has been screwed to 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 to provide safety during
transportation.
Signals on the 10-pin connector, which is at the output of SPS200M:
SPS200M – BPL200S-SPS Connector
Pin no Signal Pin no Signal
1 + 5 VDC 6 - 48 VDC
2 Ground 7 - 48 VDC
3 Ringer 8 Ground
4 PWR_DAT1 9 - 5 VDC
5 PWR_DAT0 10 Ground
The DS200S/DS200M system could be backed up with 48 VDC batteries in order to maintain
operation in case of power failures. Therefore, there is the necessary battery backup circuitry
on the power supply. Since the system does not have embedded power failure transfer
stations, battery backup is essentially important for maintaining connection of the system to
the outer world. 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/19 Ah is recommended for a full capacity system with a traffic rate of 35 %
in average.
There is also an F-Type 8A/48VDC fuse on the power supply for the battery input.
The power supply 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 a low current
cut- off circuit that turns itself off when the system voltage drops below 34 VDC, and which is
not turned on until the voltage goes above 46 VDC. Thanks to this circuit, the power supply
would prolong life of the batteries by preventing their full discharge.
Operational Information:
Three LEDs that are on the front panel of the SPS200M Power Supply Module help figure
out the power supply that is in use at the moment.
The first of those is for 230 VAC (with the “Mains Power” tag), the second one is for –48 VDC
and the third one is for +5 VDC. When the system is being feed from the mains supply
during normal operation, all LEDs light up. The “Mains Power” LED is turned off in the
absence of mains voltage. In that case, if battery backup is available, then the LED for –48
VDC remains on. In the event that a problem with the + 5VDC supply in the system occurs,
the LED for + 5VDC goes off. If that is the case, the system must be shut down.
There are also Mains and Battery On/Off switches on SPS200M. In the DS200S/DS200M
system, those switches are accessible even when the front cover is closed.