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Summary of Contents for Eaton MTL7700
- Page 1 Instruction manual September 2017 MTL intrinsic safety solutions INM 7700 Rev 12 MTL7700 range Shunt-diode safety barriers...
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Page 2: Declaration Of Conformity
The installation shall preclude intermingling between intrinsically safe circuits, including their associated wires and cables, and all other circuits, wires, and cables. b) The MTL7700 range of Shunt Diode Safety Barrier Assemblies must be securely mounted within a suitable dust-tight enclosure in a fresh air area of the mine or an explosion-proof enclosure. -
Page 3: Table Of Contents
MTL7700 range – barrier ranges . . . . . . . . . . . . . . . . . . -
Page 4: Atex Safety Instructions
This product cannot be repaired by the user and must be replaced with an equivalent certified product. Marking Each device is marked in compliance with the Directive and CE marked with the Notified Body Identification Number. This information applies to MTL7700 products manufactured during or after the year 2011. INM 7700 Rev 12... -
Page 5: Overview
MTL700 range. Section 3 includes a checklist of essential safety factors that MTL7700 range of barriers are 1-, 2- or 3-channel devices that must be considered when using MTL7700 range of barriers as use intrinsically safe explosion-protection techniques to pass intrinsically safe (IS) interfaces between safe and hazardous areas. -
Page 6: Mtl7700 Range - Accessories
It can also be used as centre 2 .3 MTL7700 range – accessories support by breaking off the top end tab. MTL7700 range of barriers mount directly onto DIN-rail. A Power accessories (figure 3) comprehensive selection of mounting, tagging, power and earthing BPL7700 Power link for feeding 24V dc to a maximum of accessories is available. -
Page 7: Safety Considerations
If it is necessary to reposition a barrier, detach it from MTL7700 range of barriers. Check the list both before and after a the DIN-rail and re-attach it in the correct location. Where minor... - Page 8 Figure 4: Dimensions (mm) of an MTL7700 range of barrier type specified by the safety documentation and that they are connected to the correct terminals.
- Page 9 MANDATORY. See also section 5.3. ETL7000 terminals are attached to the rail as follows. Ensure the Figure 6: Clamping an MTL7700 range of barrier on to a DIN-rail same security of the earth connection to the rail as for the barriers themselves (see section 4.2):...
- 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.
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Page 11: Wiring Connections
Take care that if barriers are connected to a safe-area power supply, connections are made correctly. If the internal safety fuse blows, it will destroy MTL7700 barriers. See Appendix A for specific connections for individual barriers and applications. 5 .2 .3... - 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...
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Page 13: Connections To Dummy Barriers
DIN-rail from those on which other barriers are mounted. Additionally, the DIN- Circuits in all MTL7700 range of barriers are encapsulated and so rails themselves should also be earthed separately. cannot be repaired. However, provided they are correctly installed... -
Page 14: Fault-Finding
Figure 20 depicts a typical switch-status transfer circuit protected by an MTL7787+ barrier which illustrates some of the fault-finding techniques discussed in this section. To determine the serviceability of MTL7700 range of barriers, follow the steps described in sections 7.2 to 7.3. INM 7700 Rev 12... -
Page 15: Power Supply Check
Tests c) and d) confirm the continuity of both barrier channels. If either channel is open-circuit it is most likely that the fuse MTL7700 range of barriers do not need to be subjected to routine has blown. The safe-area circuit should be investigated in an testing if they are in normal use. -
Page 16: Tests For Active Barriers
The current is measured by one multimeter and trimmed by adjusting the output voltage of the power supply indicated on the second multimeter. When using a constant-current generator for testing MTL7700 Safe-area equipment range of barriers, note the following points:... - Page 17 8 .3 .3 Tests for MTL774x Bussed Power The MTL774x range are switch/prox input barriers with a choice of V s + 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 Channel 1 Channel 1...
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Page 18: Test Tables For Passive Barriers
Test tables for passive barriers Tables 4 to 10 detail the tests for all MTL7700 range of ‘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... - Page 19 BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS Model Safety End-to-end Diode Diode Terminal Terminal No . Description Resistance Test Test Voltage Voltage Ω @ 10µA @ 20mA Ω 7728ac ∞ ∞ 26.7 25.6 Table 6: Single channel BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTS Model Safety...
- Page 20 CONSTANT-CURRENT TESTS BARRIER DATA MULTIMETER TESTS Model Safety End-to-end Diode Diode Terminal Terminal No . Description Resistance Test Test Voltage Voltage Ω @ 10µA @ 20mA Ω 7787+ ∞ 26.6 27 .4 26.7 27 .6 7787+ (ch2) — — ∞ (+) ∞...
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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 MTL7789+ Power Bus Logic signal Power +26V Signal MTL7706+ MTL7787+ 1-5V Figure A5: 2-channel switch inputs MTL7787P+ 4 -20mA 250W... - Page 22 Hazardous Safe Hazardous Safe Area Area Area Area +26V MTL7728+ MTL7761ac --7V Figure A9: Analogue output MTL7787+ +26V MTL7787P+ Sense MTL7764ac — Hazardous Safe Area Area +26V Power Bus MTL7787+ MTL7787P+ Monitor 620Ω +22.9 - 30V Output (mV) 10kΩ MTL7761ac 0V rail MTL7745 CH 1...
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Page 23: Table A - Safety Descriptions
APPENDIX B: Table A - Safety descriptions Table B - Maximum cable parameters - IIC gas group * Ta = 65°C † Terminals 3 and 7 connected together BASEEFA Group IIC Model No . Ω Model No . (µF) (mH) (µH/Ω) MTL7706+ MTL7706... - Page 24 MTL Instruments GmbH, Heinrich-Hertz-Str. 12, 50170 Kerpen, Germany UNITED ARAB EMIRATES Cooper Industries/Eaton Corporation Tel: +49 (0)22 73 98 12 - 0 Fax: +49 (0)22 73 98 12 - 2 00 Office 205/206, 2nd Floor SJ Towers, off. Old Airport Road, E-mail: csckerpen@eaton.com...
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