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Document: LT0273 MX4428 MXP Engineering / Technical Manual
Issue 1.5 24 March 2006 Page v
3.25.2 SAD ..............................................................................................................................3-51
3.25.3 AVF/SAD ...................................................................................................................... 3-51
3.25.4 FLOWSWITCH .............................................................................................................3-51
CHAPTER 4 ANALOGUE LOOP DESIGN CONSIDERATIONS ...........................4-1
4.1 ANALOGUE LOOP CONFIGURATION SELECTION .......................................................... 4-2
4.1.1 LINES & LOOPS ............................................................................................................4-2
4.1.2 LOOP FAULT TOLERANCE ..........................................................................................4-2
4.1.3 AS1670.1 DESIGN REQUIREMENTS........................................................................... 4-2
4.1.4 NZS4512 DESIGN REQUIREMENTS ........................................................................... 4-2
4.2 ANALOGUE LOOP/LINE LAYOUTS....................................................................................4-3
4.2.1 LINE MODE....................................................................................................................4-3
4.2.2 LOOP DESIGN WITH SHORT CIRCUIT ISOLATORS.................................................. 4-3
4.2.3 STAR CONNECTION OF ANALOGUE LINES .............................................................. 4-5
4.2.4 SPURS ...........................................................................................................................4-5
4.3 CABLE SELECTION CONSIDERATIONS............................................................................4-6
4.4 AC REQUIREMENTS............................................................................................................ 4-7
4.4.1 GENERAL....................................................................................................................... 4-7
4.5 DC CONSIDERATIONS.........................................................................................................4-7
4.5.1 GENERAL....................................................................................................................... 4-7
4.6 MECHANICAL CONSIDERATIONS .....................................................................................4-7
4.7 NOISE CONSIDERATIONS ..................................................................................................4-8
CHAPTER 5 MXP CURRENT CONSUMPTION.....................................................5-1
5.1 THEORY ................................................................................................................................ 5-2
5.1.1 ALARM CURRENT......................................................................................................... 5-2
5.1.2 QUIESCENT CURRENT................................................................................................5-3
5.1.3 HEAT LOSS.................................................................................................................... 5-3
CHAPTER 6 EVENT LOG AND STATUS AT MX4428 ..........................................6-1
6.1 RETURNED ANALOG VALUES........................................................................................... 6-2
6.2 FAULT AND ALARM EVENT LOG....................................................................................... 6-3
CHAPTER 7 MXP TECHNICAL DESCRIPTION ....................................................7-1
7.1 GENERAL.............................................................................................................................. 7-2
7.2 CIRCUIT DESCRIPTION .......................................................................................................7-3
7.2.1 BLOCK DIAGRAM.......................................................................................................... 7-3
7.2.2 MICROPROCESSOR & LOGIC CIRCUITRY ................................................................7-3
7.2.3 MXP POWER SUPPLY.................................................................................................. 7-4
7.2.4 MX4428 LOOP INTERFACE.......................................................................................... 7-6
7.2.5 ANALOGUE LOOP INTERFACE ...................................................................................7-7
7.3 MXP ADJUSTMENTS..........................................................................................................7-10
7.3.1 40V ISO SUPPLY VOLTAGE ADJUSTMENT .............................................................7-10
7.3.2 TX DATA VOLTAGE ADJUSTMENT ...........................................................................7-10
7.3.3 40V ISO SUPPLY CURRENT LIMIT ADJUSTMENT...................................................7-10
7.4 MXP LED INDICATIONS.....................................................................................................7-11
7.5 PARTS LIST ........................................................................................................................7-12
CHAPTER 8 MXP DIAGNOSTIC TERMINAL ........................................................8-1
8.1 MXP DIAGNOSTIC TERMINAL OPERATION...................................................................... 8-2
8.1.1 INTRODUCTION ............................................................................................................8-2
8.1.2 MENU OF COMMANDS.................................................................................................8-2
8.1.3 SELECTING POINTS FOR MONITORING.................................................................... 8-2
8.1.4 DISPLAYING DEVICE ANALOGUE VALUES - CV, TV, ETC....................................... 8-3
8.1.5 ST (STATUS COMMAND) ............................................................................................. 8-5
8.1.6 ANALOG LOOP DIAGNOSTICS.................................................................................... 8-6
8.1.7 ADVANCED COMMANDS ............................................................................................. 8-8
8.1.8 MX4428 DIAGNOSTICS ................................................................................................ 8-8