Siemens Pacemaker UM344-2 Instrukcja Użytkownika Strona 134
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UM344-2 CIRCUIT DESCRIPTION
September 1995
7
-
1
7.0 CIRCUIT DESCRIPTION
This section provides a basic circuit description of the XTC Model 344 Temperature Transmitter-
Controller. Figure 7-1 shows a functional block diagram of the transmitter.
The main Electronics Assembly is comprised a four circuit boards: Digital Board with microprocessor and
HART modem chips, Analog Board with the Digital/Analog converter and power supply, an Input Board,
and an Output Board. The baseboard contains filtering components for the transmitter I/O and an optional
digital LCD display board provides local indication of the transmitter output.
7.1 ELECTRONICS ASSEMBLY
The main Electronics Module has four boards which contain the following:
Ÿ A standard Bell 202 Modem that employs Frequency Shift Keying (FSK) for remote communications
via the HART protocol.
Ÿ A Microcontroller that:
- Controls communications
- Corrects and linearizes the sensor input signal
- Stores configuration data; configuration data is stored in nonvolatile EEPROM memory in the
Microcontroller and is retained when power is interrupted permitting the Transmitter to
become functional upon power-up
- Performs re-ranging and damping value selection upon input from user actuated local Zero,
and Fullscale pushbuttons
Ÿ A custom ASIC (Application Specific Integrated Circuit) that provides:
- A clock to the Microcontroller
- Serial D/A conversion of the Microcontroller’s signal to drive the V/I Converter
Ÿ A Low Voltage Power Supply with current limiting that provides DC operating power
Ÿ A power supply Voltage Monitor that generates a Microcontroller Reset signal when the Network
(Loop) supply voltage is interrupted.
Ÿ A Bandpass Filter that passes HART signals and rejects low frequency analog signaling.
Ÿ A Voltage-to-Current Converter (V/I) that converts the output of the ASIC's D/A to a 4 to 20 mA
loop output signal.
Ÿ Reference junction temperature sensor that measures and regulates the temperature of the TC(+)
screw terminal.
- USER’S MANUAL 1
- TABLE OF CONTENTS 2
- CONTENTS UM344-2 3
- September 1995 3
- UM344-2 CONTENTS 4
- September 1995 4
- SECTION AND TITLE PAGE 5
- LIST OF ILLUSTRATIONS 6
- LIST OF TABLES 7
- 1.0 INTRODUCTION 10
- FIGURE 1-1 Basic Model 344 11
- X02869S1 12
- 2.0 XTC COMMUNICATOR 14
- MOORE XTC COMMUNICATOR 15
- SELECT BLOCK TO EDIT 16
- - SENSOR INPUT 16
- PREV NEXT END ECT 16
- SELECT FUNCTION 18
- FIND ARCH TEST 18
- XMTR FUNC MXC END 18
- X02849S1 19
- LOOP OVERRIDE - CHOOSE 21
- CURRENT OUTPUT LEVEL 21
- 4 MA 20 MA OTHR END 21
- X02807S1 25
- SHORT OR LONG FORM 27
- ADDRESS? 27
- SHRT LONG 27
- ADDR ADDR POLL END 27
- MXC SELF TEST 28
- TEST TEST 28
- KEYS SCRN END 28
- WARNING! SELF TEST 30
- MAY BUMP TRANSMITTER 30
- OUTPUT A 30
- 4.0 INSTALLATION 35
- X02866S1 39
- X02867S1 40
- X02868S1 41
- X02817S1 42
- X02821S1 52
- Wall Mounting 53
- X02818S0 57
- FIGURE 4-8 Sensor Assembly 58
- X028AAS0 60
- X02870S1 61
- X02824S1 63
- TESTSIGNAL 66
- X02825S1 67
- MV LO : 0.0000 74
- ENTER MV LO: 74
- (F4) to change the setpoint 78
- DOWNLOADING 84
- CONFIGURATION 84
- - PLEASE WAIT 84
- DOWNLOAD 84
- COMPLETE 84
- MANUAL control mode to 92
- MANUAL control mode 92
- DG MR END CONT 96
- WARNING : ARCHIVE 97
- CONTAINS NO DATA 97
- A 97
- ERROR! ARCHIVE TYPE 98
- DOESN'T MATCH THE 98
- TRANSMITTER TYPE 98
- X02808S1 106
- X02827S1 1 of 2 111
- X02827S1 2 of 2 112
- APPLY 103.00 mV TO 115
- WITH COPPER WIRE 115
- CAL TEST END 118
- CALIBRATE / TEST 118
- TRANSMITTER PASSED 121
- TRANSMITTER SELFTEST 121
- 7.0 CIRCUIT DESCRIPTION 134
- Output Circuitry 135
- Input Circuitry 135
- X02815S0 142
- Z FS 146
- 9.0 GLOSSARY 154
- 4 - 20 mA 160
- Failsafe Level 160
- Absolute Alarm #1 161
- Absolute Alarm #2 161
- R = 162
- X02879S0 163
- Block Diagram, PD Controller 164
- Block Diagram, ID Controller 165
- X02881S1 168
- WARRANTY 177
- WARRANTY UM344-2 178
- W-2 October 1996 178
- PARTS LIST 179
- USER’S MANUAL ADDENDUM 181
- X03013S1 182
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