Eaton Crouse-Hinds Series Instruction Manual

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Eaton Crouse-Hinds Series Instruction Manual Manual pdf 19 page image

INM 4500/4600 Rev 1211DRAFT - 22 March 20185 INSTALLATION – MODULESIMPORTANT• Work should be carried out in accordance with all relevant local standards, codes ofpractice and site regulations.• Check that the hazardous-area equipment complies with the descriptive systemdocument.• Refer to the certificate/catalogue for clarification of any aspects of intrinsic safety orcontact Eaton’s MTL product line or your local representative for assistance.• Make sure the correct hazardous-area connector (field-wiring plug) is plugged into thecorresponding isolator. It is recommended that the connector is identified by the same tagnumber as the matching isolator.5 1 Modules – pre-installation5 1 1 Switch settings for operating conditionsSome modules have operating conditions, such as Line-Fault Detection (LFD), PhaseReversal, etc., that can be established by the setting of switches on the unit. Thesubminiature switches are accessible through an aperture on the side of the module (seeFigure 5.1) and can be set in the required positions with, for example, the blade of a smallscrewdriver.The switch setting options are always indicated on the side label of the module, but the usermay also consult the individual module information in Section 6 of this manual for details.5 1 2 Relay outputsReactive loads on all units with relays should be adequately suppressed. To achieve maximumcontact life on all mechanical output relays, the load should not be less than 50mW, e.g. 10mAat 5V DC.5 1 3 Ambient temperature considerationsThe MTL4500 range of isolators are rated for an ambient operating temperature range of–20°C to +60° even when they are mounted (close-packed) on a backplane, except whereotherwise noted.5 1 4 Module and backplane orientationThe orientation of the backplane will have an influence on the amount of air flow throughand around the modules, so this must be considered if this operating temperature range isto be maintained. There are two main orientations for the backplanes, as shown in Figure 5.2.Although orientation b), where the modules are aligned in a vertical plane, is the optimum forheat transfer, orientation a), where the modules are horizontal, is the most frequent because itis probably the most convenient for cabling.5 1 5 Cabinet and enclosure mountingThe backplanes are normally mounted with other equipment in an enclosure or wiring cabinet,so particular consideration must be given to the management of the internal temperature andthe need to remove heat from around the modules. Space around the modules is essential forthe free movement of air and adequate ventilation is required for its removal.The larger the source of heat, the higher it should be mounted in the cabinet, this is in orderto avoid the creation of an undesirable temperature gradient from the bottom of the cabinet tothe top.Principal sources of heat in such circumstances are ac/dc power supplies for the internalequipment. These should certainly be located at the top of the cabinet to limit the effect of theirdissipated heat.Figure 5 1:Location ofswitchesOFF positionON position1 2 3 4