Dwyer MTL7787 Manuale Utente

Instruction ManualINM7700MTL7700 SeriesShunt-diode safety barriers

6INM7700-6 Jan 2010High - profileDIN railORLow - profileDIN rail2 off M4 x 16M6 X 1650mm62mm14.6mm20mmFigure 9: Mounting ISP7000 insulating spacersE

7INM7700-6 Jan 20105 WIRING CONNECTIONS5.1 GeneralThis section describes wiring connections as follows:a) Barrier connections Section 5.2b) Connecti

8INM7700-6 Jan 20105.3.2 Earthing an installationSee figure 15. Connections from the DIN-rail to a suitable plant earthare made from ETL7000 earth t

9INM7700-6 Jan 20105.3.5 Bonding practice when hazardous-area equipment cannot meet prescribed insulation standardsWhere hazardous-area equipment is

10INM7700-6 Jan 2010Check that:a) Barriers are of the types and polarities specified in the safetydocumentation.b) The barriers are attached securel

11INM7700-6 Jan 20107.2 Power supply checkCheck that the power supply to an individual barrier circuit (or to anMTL7798 power feed module or an MTL7

12INM7700-6 Jan 20108.2.2 Multimeter testsSee tables 4 to 10. The use of a digital multimeter for testing barriersis described in section 7. The tab

13INM7700-6 Jan 2010Input Output Line FaultOpen circuit Open ClosedShort circuit Closed Closed620Ω Closed Open10KΩ Open Open8.3.3.2 Testing MTL7742

14INM7700-6 Jan 2010BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTSMTL Safety End-to-end Diode Diode Terminal Terminalmodel Description Resista

15INM7700-6 Jan 2010Table 6: Single channel BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTSMTL Safety End-to-end Diode Diode Terminal Terminalm

iiINM7700-6 Jan 2010

16INM7700-6 Jan 2010BARRIER DATA MULTIMETER TESTS CONSTANT-CURRENT TESTSMTL Safety End-to-end Diode Diode Terminal Terminalmodel Description Resista

17INM7700-6 Jan 2010APPENDIX A: TYPICAL WIRING CONNECTIONS FOR SPECIFIC APPLICATIONS.HazardousAreaSafeArea3412250W4 -20mAPower +26VSignalPower Bus1

18INM7700-6 Jan 2010HazardousAreaSafeArea3412MTL7728+0V+26VPIFigure A9: Analogue outputHazardousAreaSafeArea3412+7V3412MTL7761acMTL7764ac3412MTL7761

Group Internet home page http://www.mtl-inst.com/Members of The MTL Instruments GroupMTL Instruments Pty Limited9 /12 Billabong StreetStaffordQueensla

1 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 DESCRIPTION

INM7700-6 Jan 2010iv

1INM7700-6 Jan 2010MTL7700 SeriesShunt-diode safety barriersINM7700-6Jan 2010Figure 1: MTL7700 Series shunt-diode safety barriers1 OVERVIEWThis inst

2INM7700-6 Jan 20102.3 MTL7700 Series – accessoriesMTL7700 Series barriers mount directly onto DIN-rail. Acomprehensive selection of mounting, taggi

3INM7700-6 Jan 2010ERB57OIMB57ETL7000ERL7ETM7ISP7000THR2/THR7000Figure 3: MTL7700 Series earthing accessoriesNote: Module earth terminals may be use

4INM7700-6 Jan 201090Hazardous-areaterminalsSafe-areaterminals12.6105Installation and approval side labelProduct top labelColour-coded top labelTop

5INM7700-6 Jan 2010TAG57TGL7700ERB57OIMB57ETL7000ISP7000110mm110mm170mmFigure 5: Clearance for accessories Note: For high profile (15mm) DIN rail, a