Eaton CROUSE-HINDS Series Operating Instructions Manual

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132 Safety instructionsaTarget group:For skilled electricians and qualifiedpersonnel in accordance withnational legislation, including the relevantstandards and, where applicable, in acc.with IEC/EN 60079-14 on electrical appara-tus for explosive atmospheres.The control units GHG 411 and GHG 412 arenot suitable for zone 0 and Zone 20 hazard-ous areas.The temperature class and type of protec-tion stated on the apparatus shall beobserved.Modifications or changes to the controlunits are not permitted.They shall be used for their intendedpurpose and shall be in a perfect and cleanstate.The requirements of the IEC/EN 60079-31regarding excessive dust deposits andtemperature to be considered from the user.Only original CEAG parts may be used asreplacements and for repairs.Repairs that affect the explosion protectionmay only be carried out by COOPERCrouse-Hinds or by a qualified electrician incompliance with the respective nationalregulations.Prior to being put into operation, the controlunits shall be checked in accordance withthe instructions as per section 6.The national safety rules and regulations forthe prevention of accidents, as well as thesafety instructions included in theseoperating instructions, that, like this text,are set in italics, shall be observed!!3 Conformity with standardsThe apparatus is conform to the standardsspecified in the EC-Declaration of conformity,enclosed separately.References to standards and directives in theseoperating instructions always relate to the latestversion. Other additions (e.g. details relating tothe year) shall be observed.4 Field of applicationThe control units are intended for use inpotentially explosive atmospheres in zones 1, 2as well as in Zones 21 and 22 in accordancewith IEC/EN 60079-10-1 and IEC/EN 60079-10-2.The enclosure materials used, including anyexternal metal parts, are high quality materialsthat ensure a corrosion resistance andresistance to chemical substances according tothe requirements for use in a ”normal industrialatmosphere”- impact resistant polyamide- special steel AISI 316 L.In case of use in an extremely aggressiveatmosphere, please refer to manufacturer.5 Application / PropertiesThe control units GHG 411 and 412 areintended for the local control of electricalinstallations in potentially explosive atmos-pheres. The units are fitted with built-incomponents according to the respectiveapplication.Specially marked special versions of the controlunits can be used in ”intrinsically safe circuits”.The electrical limiting values that aredecisive for the intrinsic safety shall beobserved.The version with gold-tipped contacts is suitedfor switching extra-low voltage circuits. Specialattention shall be paid to the maximum currentload (see technical data). The contact chamberof the gold-tipped version is marked with theletter ”G” or colour-coded.To ensure a safe and reliable disconnection, thenormally closed contacts are designed ascompulsory opening contacts.Where required, the bases are fitted with 0.6 Wresistors, fine-wire fuses and diodes(max. power dissipation 1 W).The measuring instruments AM/VM72 andAM/VM45 are used for the local indication ofelectrical values. See ”Technical Data” fordetails of measuring mechanism, accuracy andconnection.With measuring instruments AM/VM72 andAM/VM45 for c.t. connection n/1A (Fig. 1,item 2) the interchangeable scales can beexchanged via a flap on the upper part of themeasuring instrument (Fig. 1, item 1).When the switch collar of small controlswitches is cut out at the respective lockingposition, they can be padlocked (padlockshackle Ø up to 5 mm).EExplosion-protected control unitsGHG 411 and 412