Tyco MX4428 technical manual Analogue Loop Design Considerations

Document: LT0273			MX4428 MXP Engineering / Technical Manual
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

Issue 1.5 24 March 2006 Page v