Siemens Pacemaker UM344-2 Manual de usuario Pagina 44
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Valorado. / 5. Basado en revisión del cliente
INSTALLATION UM344-2
September 1995
4
-
10
Power supply output voltage must be less than the calculated value. The maximum voltage across the
input terminals of a Transmitter should never exceed 42 volts.
The maximum number of Transmitters that can be connected to a Multi-Drop Network is fifteen. Each
Transmitter is "parked" in a low current draw mode (4 mA) to conserve power. Ensure that the network
power supply is capable of sourcing the total current consumed by the number of transmitters on the
Network.
4.3.5 Cable Capacitance and Maximum Length
A cable length calculation is necessary when HART communication is to be employed. Cable
capacitance directly affects maximum Network length.
4.3.5.1 Cable Capacitance
Cable type, conductor size, and recommended cable model numbers are stated in Section 8.3.3 Two-Wire
Cable.
Cable capacitance is a parameter used in the calculation of the maximum length of cable that can be used
to construct the Network. The lower the cable capacitance the longer the Network can be.
Manufacturers typically list two capacitance values for an instrumentation cable:
1. Capacitance between the two conductors.
2. Capacitance between one conductor and the other conductor(s) connected to shield. This
capacitance is the worst case value and is to be used in the cable length formula.
4.3.5.2 Maximum Cable Length Calculation
The maximum permissible single-pair cable length is 10,000 feet (3000 meters) or less as determined by
the following formula:
65,000,000 C
f
+ 10,000
L = -
R x C C
Formula Definitions:
L: The maximum total length of cable permitted to construct the Network. L = Feet when C is in
pF/ft. L = meters when C is in pF/meter.
R: The Network Resistance which is the ohmic sum of the Current Sense Resistance and Barrier
Resistance (both Return and Supply), if any, in the Network and the resistance of the wire.
- 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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