Eaton Crouse-Hinds Series Instruction Manual

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Eaton Crouse-Hinds Series Instruction Manual Manual pdf 16 page image

DRAFT - 20 November 2014INM 9370-SS Rev 7125 MAINTENANCEWhen the enclosure is installed in a hazardous area it is important for personnel tounderstand what activities are permissible when fieldbus power is present and what are not.WARNING!Read and understand what work is permitted inside the enclosure.Failure to comply with these instructions can endanger the lives orhealth of personnel and risk damage to the plant and the environment.5.1 GeneralThe following items in the enclosure may be removed or disconnected while the trunk isstill powered.• 9377-FB-R Fieldbus Barrier module(s)• 9378-FT Terminator module• 9376-SP Trunk Surge module• FS32 Spur Surge modules and any spur wiringAll other wiring in the enclosure requires the trunk power to be isolated, or a gas clearancecertificate to be obtained before any work is carried out.5.2 Fieldbus Barrier - fitting and removalNote: See page 1 for important information regarding the rules of interchangeability thatapply to the earlier 9377-FB and the current 9377-FB-R barrier models.The fieldbus barrier module(s) may be fitted or removed without the need to isolate trunkpower. The trunk connections to the barrier module on the carrier have spark suppressionby design and cannot cause ignition while they are being connected or disconnected.Figure 5.1 - Fieldbus Barrier module – fitting & removalFitting a Fieldbus Barrier module (refer to Figure 5.1)Note: Before fitting a fieldbus barrier module check the connection pins on its undersideto ensure that they have not been bent or damaged in any way. Do not use, or attemptto repair, a barrier module that has any of its pins bent or damaged, because this mightaffect its safety and invalidate the certification.a) Engage the locating guides of the fieldbus barrier module into the sockets providedon the carrier and push the module fully into place.b) Tighten the captive fixing screws on each side and at the top of the module (to arecommended torque of 0.9Nm) to secure it.