FEATURES DESCRIPTION

Transcription

1 JUNCTION BOXES

2 FEATURES Allows easy and safe device connections to the fieldbus (Fo u n d at i o n fieldbus TM, PROFIBUS) HART and even for standard instrumentation wiring 4-20 ma; Ideal for coupling sensors, actuators and measuring instruments in safe and hazardous areas; Prevents short-circuiting to the entire bus during maintenance; Permits disconnecting one device without disrupting the bus; Reduces wiring costs as well as minimizes design costs of the process control system; Reduces stops, start-up time, and simplifies electrical maintenance; The weather proof housing prevents water, oil and dust from reaching the connections; 4 input/output connections used according to the application convenience; Easy internal bus terminator accommodation; The cables can be handled separately without interference from their wires; The bus trunk is separated from spurs, so any intervention in spurs not interferes in the operation of the trunk bus; Housing in aluminum or stainless steel. Cover gasket allows the use in watertight or wash-down applications; Locking mechanism; External grounding termina; Does not require lugs; Easy bus terminator accommodation Easy and safe connection DESCRIPTION The JM400 is a junction box especially designed for fieldbus and conventional instrumentation connections, for sensor and actuators connections. in case of device maintenance. This arrangement makes possible the disconnection of devices keeping the continuity of the whole bus, and also avoiding short-circuits. The IP66/68 rated enclosure combined with appropriate cable glands, protects the wire connections from dust, water and moisture. The IP66/68 rating matched with the adequate cable glands prevents water, oil, dust, and other mixtures from reaching the connections. It may be used indoors or outdoors and can withstand the most severe environments. The cover with internal threads allows an easy access to the terminals, without the use of special tools. The terminals are twin type at the four ends. They can be used as the input and output of the bus according to the application convenience, keeping apart the wires that should be disconnested 2

3 FIELDBUS OPTIMIZED THROUNGH JUNCTION BOXES Fieldbus presents several benefits, like cable reduction and installation flexibility. Several topologies can be used; the cable reduction will depend on the chosen topology. But what really happens when we build a Fo u n d at i o n fieldbus TM or PROFIBUS PA installation. Most installations will not benefit from this reduction, due to the use of conventional junction boxes that distributes wires to several field devices. When using conventional junction boxes, the topology used will most likely be the star topology. With this topology many devices will be derived from the same junction box, with each device requiring a pair of wires. Star Topology To really optimize cable amount a bus topology must be used. A true cost-effective bus topology can only be achieved using distributed junction boxes. Specially designed for Fieldbus topology JM400 improves the cable reduction allowing Fieldbus installations to reach their maximum savings and flexibility. These features make this type of junction box perfect for Fieldbus installations, reducing wiring and make easier maintenance. The installations used in conventional instrumentation also can be benefited by JM400 features. The JM400 junction boxes can be placed nearby the devices and do not require special supports to be mounted on. Bus Topology 3

4 TECHNICAL CHARACTERISTICS Functional Specifications Service Fieldbus (Fo u n d at i o n fieldbus TM, PROFIBUS), HART and conventional instrumentation wiring (4-20 ma), for sensor and actuators connections in safe and hazardous areas. C Hazardous Area Certification Certificate Nº: CEPEL- EX-0899/05X Explosion proof Ex d II C T T6 (-20 C < Tamb < 40 I=16 A; I= 23 A) T6 (-20 C < Tamb < 60 I=16 A) T5 (-20 C < Tamb < 40 I=23 A) T4 (-20 C < Tamb < 85 I=16 A; I= 23 A) Máx. Nominal Voltage: 750 V Máx. Nominal Current: 16 and 23 A Enclosure IP66/68 (Aluminum SAE 336 or A356) IP66/68W (AISI 316) Temperature Limits Ambient: -40 to 85 C (-40 to185 F). Humidity Limits 0-100% RH. Physical Specifications Electrical Connection ½ - 14 NPT, Pg 13,5 or M20 x 1,5 metirc. Rated Voltage: 750 V Rated Current: 23 A Housing Material Aluminum or stainless steel housing, saline environment included. Mounting Can be fixed on wall or panel. Weight Approximately 0.7 Kg (Aluminum) and 1.8 kg (Stainless Steel). ORDERING CODE JM400 FUNCTION BOXES COD. Electrical Connections 0 A B 1/2-14 NPT M20 x 1.5 Pg 13.5 DIN COD. H0 C H1 I H2 H3 Housing Material Aluminum Stainless Steel Aluminum for saline enviromenment Stainless Steel 316 for saline environment COD. Connections Types C1 C2 Spring* Screw JM400 A H0 C2 * Spring Connector (previous version) 4

5 ORDERING CODE Identification Plates I5 I6 IL Spare Parts CEPEL Centro de Pesquisas de Energia Elétrica Without Certification CEPEL: (Exd) + IP66/ Aluminum Cover Stainless Steel Cover Locking mechanism screw O-ring ¾ female NPT to ½ male NPT reduction sleeve, 316 SST Ex d ½ NPT internal hexagon plug, plated CS BR Ex d ½ NPT, internal hexagon plug, 304 SST BR Ex d M20 X 1.5 external hexagon plug, 316 SST BR Ex d PG 13.5 external hexagon plug, 316 SST BR Ex d ½ NPT internal hexagon plug, plated CS SAE ½ NPT internal hexagon plug, 304 SST GROUNDING The housing grounding must be done via ground screw, external, next to the identification plate. DIMENSIONS Dimensions are mm. 5

6 DIMENSIONS Mensagem smar Specifications and information are subject to change without notice. Up-to-date address information is available on our website. web: Copyright Smar International - all rights reserved. - September/2009 E 6