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G9SB-3012-A Datasheet(PDF) 9 Page - Omron Electronics LLC |
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G9SB-3012-A Datasheet(HTML) 9 Page - Omron Electronics LLC |
9 / 10 page Precautions for All Relays with Forcibly Guided Contacts Note: Refer to the Safety Precautions section for each Switch for specific precautions applicable to each Switch. ■ Precautions for Safe Use Mounting The Relays with Forcibly Guided Contacts can be mounted in any direction. Relays with Forcibly Guided Contacts While the Relay with Forcibly Guided Contacts has the previously described forcibly guided contact structure, it is basically the same as an ordinary relay in other respects. Rather than serving to prevent malfunctions, the forcibly guided contact structure enables another circuit to detect the condition following a contact weld or other malfunction. Accordingly, when a contact weld occurs in a Relay with Forcibly Guided Contacts, depending on the circuit configuration, the power may not be interrupted, leaving the Relay in a potentially dangerous condition (as shown in Fig. 1.) To configure the power control circuit to interrupt the power when a contact weld or other malfunction occurs, and to prevent restarting until the problem has been eliminated, add another Relay with Forcibly Guided Contacts or similar Relay in combination to provide redundancy and a self-monitoring function to the circuit (as shown in Fig. 2). Refer to the Technical Guide section. The G9S/G9SA/G9SB Safety Relay Unit, which combines Relays such as the Relay with Forcibly Guided Contacts in order to provide the above-described functions, is available for this purpose. By connecting a contactor with appropriate input and output to the Safety Relay Unit, the circuit can be equipped with redundancy and a self-monitoring function. CE Marking (Source: Guidelines on the Application of Council Directive 73/23/ EEC) The G7SA, G7S and G7S- @-E have been recognized by the VDE for meeting the Low Voltage Directive according to EN requirements for relays and relays with forcibly guided contacts. The Low Voltage Directive, however, contains no clauses that specify handling methods for components, and interpretations vary among test sites and manufacturers. To solve this problem, the European Commission has created guidelines for the application of the Low Voltage Directive in EU. These guidelines present concepts for applying the Low Voltage Directive to components. The G7SA, G7S and G7S- @- E, however, do not display the CE Marking according to the concepts in the guidelines. VDE recognition, however, has been obtained, so there should be no problems in obtaining the CE Marking for machines that use the G7SA, G7S or G7S- @-E. Use the manufacturer’s compliance declaration to prove standard conformance. Contents of the Guidelines The Guidelines on the Application of Council Directive 73/23/EEC apply to components. Relays with PWB terminals are not covered by the Low Voltage Directive. K1 S1 S2 K1 K1 S1 11 12 21 22 S2 K1 K2 K3 + − D F1 K3 K1 K1 K1 K3 K2 K2 K2 K3 A1 A2 T11 T12 Y1 X1 13 B1 PE T21 T22 14 Fig 1 Fig 2 Power source Power source http://www.ia.omron.com/ C-1 (c)Copyright OMRON Corporation 2007 All Rights Reserved. |
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