Eaton 9372-FB-P Series Instruction Manual

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Eaton 9372-FB-P Series Instruction Manual Manual pdf 10 page image

INM 9370-RD Rev 58After mounting the enclosureCheck that:• it has not suffered any damage,• the IP rating is not affected; for example, by distortion of the enclosure,• the mounting bolts/nuts are all tightened as recommended above.4 INITIAL ELECTRICAL INSTALLATIONWARNING!Before starting any electrical installation work, ensure that theincoming trunk connection is isolated from any source of power.CAUTIONThe temperature inside the enclosure could rise to 75°C. Ensure that all cables andcable glands fitted are rated to withstand these temperatures.4.1 OverviewCaptive screws are used to secure the lid. Loosen these screws to obtain entry.CAUTIONThe lid of the stainless steel enclosure is connected to the enclosure body with aprotective grounding cable.DO NOT leave the lid hanging by this link cable while work is carried out!• The enclosure receives power from the incoming trunk cable and requires nofurther source of power.• The equipment shall only be powered from supplies conforming to IEC 61158.• Type ‘A’ fieldbus cable is recommended for fieldbus trunk connections.• The terminal blocks for the trunk fieldbus cables have either screw terminalconnectors or cage clamp connectors according to the enclosure modelspecified, but both are suitable for cables from 0.5mm2/AWG 20 up to 2.5mm2/AWG 14.On completion of installation, check all blanking plugs and cable glands are tightenedto ensure IP rating of the enclosure is maintained.Details of the internal wiring for the two enclosure types is provided in Appendix 1.4.2 GroundingTwo distinct ground concepts should be recognised before wiring of the enclosurebegins:a) Protective local ground - mandatoryb) Cable shield groundThese two concepts and their implementation are explained below.4.2.1 Protective local groundThis ground connection is required to ensure that any exposed metalwork in, oron, the enclosure does not present a hazard to personnel; it also provides a lowimpedance earth grounding circuit for any surge protection items used in theenclosure. An external M10 earth-grounding stud is provided on the side wall of theenclosure to enable a connection to be made to the local ground.Use a ring terminal to make a good quality, plant safety-earth connection (4mm2cross-sectional area or better) to this bolt and tighten it to a recommended torque of5Nm.Note: It is important to prevent this connection from loosening and also to protect itfrom corrosion against the stainless steel grounding stud.4.2.2 Cable shield groundThe enclosures can be configured by the user to either of two grounding methods. Theuser should adopt the one that conforms to their system’s normal grounding method.