INFICON Composer Gas Concentration Controller - Manual (Page 60)

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Composer Operating Manual
2.6.2.7 Power Supply
U27, U25, U23, U11,
U10, U22, U4
A LT1070(U27) is used as an 18 volt pre-regulator adjusted by R60. A
UC3846(U25) is used to drive the primary of isolation transformer T1 with Q3
and Q4. Secondary winding outputs are rectified and filtered and then regulated
by U23, U11, U10 and U22 to -15, +15, +5 and -5 volts. A DS1231(U4) is used
to detect power fail and to provide a power up reset pulse.
2.6.2.8 Composer Connector Board
IPN 761-132
The connector board provides analog I/O and RS-232C connections and
configuration setting by 16 DIP switches. Two 74HC168’s(U1,U2) parallel to
serial shift registers are used to read DIP switch settings with the serial
communications made directly by CPU I/O pins. A MC14506(U3) is used as a
level translator between the CPU UART TTL signals and RS-232C levels. The
analog outputs utilize a LT1014(U4C,D) precision OP-AMP configured in such
a way that loads down to 1K can be driven to +/- 10 volts with no loss of
precision. Also using the LT1014(U4A) the circuit divides the input voltage of +/-
10 by four to properly scale it for the A/D converter while simultaneously
allowing over voltage protection.
2.6.3 Monitor Software
IPN 761-700-G1
Optional. A more complete digital interface that includes the Setup Tool
described in
section 2.6.5 below. Additional functionality includes scrolling
graphics, data logging, and access to additional test and diagnostic software.
2.6.4 Power Supply - External
Š IPN 761-615-G1, North American
Š IPN 761-615-G2, European
Optional. A Universal input type power supply converts local line current to
regulated and current limited 24 V(dc) for powering the controller.
2.6.5 Setup Tool Software
A basic Windows software application that provides a means to readout the
controller’s parameters and change them through an RS-232C Interface.
Version 1.5 and greater is Windows 95 and Windows NT compliant.