Related Manuals for Eaton MTL770 Series
Summary of Contents for Eaton MTL770 Series
- Page 1 MTL7700 Series Shunt-diode safety barriers Instruction Manual 1.888.610.7664 www.calcert.com sales@calcert.com INM7700...
- Page 2 1.888.610.7664 www.calcert.com sales@calcert.com INM7700-6 Jan 2010...
-
Page 3: Table Of Contents
CONTENTS PAGE OVERVIEW ............. . 1 DESCRIPTION . - Page 4 1.888.610.7664 www.calcert.com sales@calcert.com INM7700-6 Jan 2010...
-
Page 5: Overview
MTL7700 Series INM7700-6 Jan 2010 Shunt-diode safety barriers Figure 1: MTL7700 Series shunt-diode safety barriers OVERVIEW DESCRIPTION This instruction manual contains all information needed to install, Introduction maintain, fault-find and test MTL7700 Series shunt-diode safety MTL7700 Series ‘fourth-generation’ intrinsically safe shunt-diode barriers. -
Page 6: Mtl7700 Series - Accessories
The tagging systems for individual modules and columns of barriers Type Application Key barriers are described here. They are shown below under Tagging accessories for columns of barriers. Analogue Resistance temperature detectors 7755ac Mounting accessories (figure 2) input Thermocouples, ac sensors 7756ac (low-level) 7760ac... -
Page 7: Safety Considerations
INSTALLATION General MTL7700 Series barriers clamp directly onto standard T-section DIN- rail (DIN EN 50 022). The simple mounting procedure for barriers is described in section 4.2 and for accessories in section 4.3. 4.1.1 DIN-rail length BEFORE mounting the barriers, make sure the rail length is sufficient for the proposed number of barriers and for other mounting ERB57O accessories. - Page 8 Item Refer to no. section: Action Hazardous- Safe-area area terminals terminals Before beginning installation, check that the safety documentation confirms that proposed system is fully certified (if applicable) and complies with the recommendations contained in the relevant sections of IEC 60079-14 for the gas group, temperature classification and area classification required.
- Page 9 TGL7700 TAG57 ERB57O IMB57 ETL7000 170mm ISP7000 Figure 5: Clearance for accessories Note: For high profile (15mm) DIN rail, add 7.5mm to vertical dimension 110mm 110mm 4.3.3 DIN-rail earth terminal (ETL7000) See figure 10. For those applications (the majority) in which the IS earth is NOT routed through the mounting surface, connections for routing the IS earth from the DIN-rail to an appropriate plant earth are made through earth terminals (ETL7000) clamped onto the DIN-...
- Page 10 Note: Early versions of TH7700 are hinged on two small locating M6 X 16 pins. Later versions are hinged by locating the clips at the hinged end into the rectangular appartures on the barrier body. The later design High - profile can be retrofitted on early modules by removing the hinge pins with DIN rail a knife.
-
Page 11: Wiring Connections
WIRING CONNECTIONS Up to 40 barriers can be linked using the power links. The link itself is supplied from a power feed module (MTL7798). The MTL7798 power feed module is provided with a trip circuit which protects the General barriers by switching off their supply if a fault (such as an This section describes wiring connections as follows: overvoltage) occurs in the power source. - Page 12 Hazardous Safe Area Area MTL7798 (MTL7799) Power To IS earth Connections Loop power to opposite ends to allow module removal ETL7000 earth terminal Figure 15: Plant earth connection to ETL7000 earth terminal Logic signal MTL7787+ MTL7787P+ 5.3.3 Earthing an earth rail assembly On installations which include earth rail assemblies (see section 4.3.4) an earth conductor, normally copper wire with a cross- Power Bus...
-
Page 13: Connections To Dummy Barriers
TGL7700 TAG57 (optional earth rail) ERB57O ETM7 IMB57 Cable screens using earth rail ETL7000 Cable screens using module terminals ISP7000 Figure 17: Earthing and screening using module earth terminals or earth rail alternative 5.3.5 Bonding practice when hazardous-area f) In general, the use of barriers in all measurement leads reduces equipment cannot meet prescribed insulation the possibility of earth circulating currents causing measurement standards... -
Page 14: Fault-Finding
Safe area Hazardous area Hazardous area Zone 0, 1 or 2 (Zone 2) or safe area Enclosure DIN-rail Barriers Local distribution Safe-area transformer equipment Hazardous-area equipment incapable of withstanding insulation test 1Ω maximum Bonding conductor <100m: 4mm minimum 100 200m (maximum): 8mm minimum Figure 18: Bonding practice where hazardous-area equipment cannot meet required standards of insulation from earth Check that:... -
Page 15: Power Supply Check
Power supply check 8.1.1 Thermocouple circuit testing Thermocouple test and calibration equipment is rarely certified Check that the power supply to an individual barrier circuit (or to an intrinsically safe and therefore requires special authorisation before it MTL7798 power feed module or an MTL7799 dummy barrier can be used for testing or calibrating thermocouple circuits in sourcing the power bus ) is functional and that the voltage across the hazardous areas. -
Page 16: Tests For Active Barriers
8.2.3 Constant-current tests For these tests (last column of tables 4 to 10) a constant-current generator capable of supplying 10µA, 20mA and 40mA currents from a 30V source is needed. Ideally, a purpose-built current generator should be used but, alternatively, a set-up based on a laboratory power supply and two multimeters (figure 23) will serve. - Page 17 8.3.3 Tests for MTL774x Bussed Power V s + The MTL774x range are switch/prox input barriers with a choice of changeover relay contacts or a solid state switch acting as the safe area interface. Relay contacts provide a universal interface capable of switching a wide range of signals including ac, low level and high Channel 1 Channel 1...
-
Page 18: Test Tables For Passive Barriers
Test tables for passive barriers Tables 4 to 10 detail the tests for all MTL7700 Series ‘passive’ barriers. In the ‘diode test’ columns, the figures adjacent to the diode description indicate the number of forward-biased diodes used in the barrier chain. Using the multimeter diode test function and knowing the diode voltage drop figures (approximately 0.6V for each Zener diode and 0.3V for each Schottky diode), the expected reading across the diode chain can be determined. - Page 19 BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS Safety End-to-end Diode Diode Terminal Terminal model Description Resistance Test Test Voltage Voltage Ω Ω @ 10μ μ A @ 20mA Ω Ω Min Max ∞ ∞ 7728ac 28 300 93 26.7 25.6 27.2 Table 6: Single channel BARRIER DATA MULTIMETER TESTS...
- Page 20 BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS Safety End-to-end Diode Diode Terminal Terminal model Description Resistance Test Test Voltage Voltage Ω Ω @ 10μ μ A @ 20mA Ω Ω Min Max ∞ 7787+ 28 300 93 26.6 27.4 26.7 27.6 ∞...
-
Page 21: Appendix A: Typical Wiring Connections For Specific Applications
APPENDIX A: TYPICAL WIRING CONNECTIONS Hazardous Safe FOR SPECIFIC APPLICATIONS. Area Area Power Bus Hazardous Safe Area Area Power +26.6V Logic signal Power +26.6V Power Bus MTL7789+ Logic signal Power +26V Signal MTL7706+ MTL7787+ 1-5V MTL7787P+ Figure A5: 2-channel switch inputs 4 -20mA 250W MTL7788+... - Page 22 Hazardous Safe Hazardous Safe Area Area Area Area +26V MTL7728+ MTL7761ac --7V Figure A9: Analogue output Sense MTL7764ac — Hazardous Safe Area Area Power Bus 620Ω +22.9 - 30V Output (mV) 10kΩ MTL7761ac MTL7745 CH 1 Figure A10: Single channel switch/proximity input with Line Figure A13: Strain-gauge bridges Fault Detect Hazardous...
- Page 23 1.888.610.7664 www.calcert.com sales@calcert.com...
- Page 24 MTL Instruments Pty Limited MTL Italia srl 9 /12 Billabong Street Via Cantù 11 Stafford I - 20092 Cinisello Balsamo MI Queensland 4053 Italy Australia Tel: +39 (0)2 61802011 Fax: +39 (0)2 61294560 Tel: + 61 1300 308 374 Fax: + 61 1300 308 463 E-mail: info@mtl-inst.it E-mail: enquiries@mtlaus.com.au MTL Instruments KK...
Need help?
Do you have a question about the MTL770 Series and is the answer not in the manual?
Questions and answers