SECTION
MITL9105/911
O-096-350-NA
.
6. SX-1 OO/SX-200 POWER SUPPLY
c
6.01
The SX-lOO/SX-200 power supply forms an integral part of the
equipment cabinets. The SX-100 power supply is housed im-
mediately to the right-hand side (front view) of the equipment shelf
(Figure 6-l). In the SX-200 system the power supply is housed in a
metal cabinet forming the lower rear door of the system (Figure 6-2).
Both supplies are fully
R-F.-filtered
and may be operated from either
AC or DC inputs to produce multiple DC output rails as well as ringing
voltage. This Part will discuss the power supplies in four subparts, as
follows: AC/DC Converter, DC/DC Converter, Ringing Generator and
Out-of-Tolerance. There are also subparts on the Reserve Battery
Backup and Charger, and Fusing.
AC/DC Converter
6.02
The SX-lOO/SX-200 AC/DC converter is designed to operate
with an AC power source in the range of 100
-
130
Vat
or 200
-
250
Vat,
with an internal modification for the SX-200 system and a
converter for the SX-100 system (see Section
MITL9105/9110-096-
200-NA). The SX-200 converter has an output of -60 to -64 Vdc, while
the SX-100 converter has an output of -50 Vdc to -56 Vdc.
DC/DC Converter
6.03
The converter output is fed to the main DC/DC converter and
Control Voltage Supply. The DC/DC converter may also be fed
by a 48 Vdc reserve power supply. The battery supply may be con-
nected permanently and will allow instantaneous cutover should the
AC power fail. The control voltage section provides the following
voltages:
l
+8 Vdc
l
-5 Vdc
l
0 Vdc
l
-10 Vdc
l
-48 Vdc.
Ringing Generator
6.04 The ringing generator uses a -48 Vdc output from the main
converter to produce a 90
Vat,
20 Hz (optional 17 Hz or 25 Hz)
supply for the system ringing.
Out-of-Tolerance
6.05
All voltage levels are regulated 5 % except for the -48 Vdc
which may vary 10
%.
An Out-of-Tolerance
(OOT)
circuit moni-
tors all levels continuously (see Table Cl-2). Should a deviation occur,
an OOT signal will activate the power fail transfer circuit through the
interconnect card. It should be noted that if a -48 Vdc reserve power
supply is used, the power fail transfer will not be activated in the event
of a power failure. In the SX-100 and SX-200 systems there are
provisions to program a port as a Contact Monitor
(MITLg105/9110-
Page 72
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