Magnetic Control Relays
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| 1. Electromechanical devices are devices which are activated by a _____ produced by an electrical ____ in a conductor. | magnetic field, current flow
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| 2. ____ convert electrical energy directly into linear mechanical motion | solenoid
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| 3. List the three parts of an AC solenoid | frame, armature, coil, p13
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| 4. A relay is an electromagnetically controlled ____ | switch
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| 5. Draw the following NEMA and IEC symbols used with relays | p 13
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| 5. Draw NEMA symbol for both a normally open and a normally closed relay contact | p 14
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| 6. Describe the difference between a single-break and a double-break contact on a relay. | a single break acts as a hinge with open and close. A double break lifts up and down to open and close.
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| 7. The term___ relay is rused to describe a relay which enables the energy in a high-powered circuit to be switched by the low-power circuit in a control system. | interposing
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| 8. ___(NEMA/IEC) relays typically operate twice as long as (NEMA/IEC) relays. | NEMA, IEC
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| 9. Machine tool relays have ___ contacts, but may have as many as ____ contacts. | 2,8
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| 10. Contacts on relays which can be configured as either normally open contacts or normally closed contactsare called ___ contacts. | convertible No to Nc
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| 11. A ___ relay is designed to accept additional sets of contacts called add-on contacts or adder decks | configurable
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| 12. Explain the function of a shading coil on a relay | keeps it closed at 0 degrees p62
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| 13. NEMA machine control relays may be rated up to __ amps, while IEC machine control relays have a maximum rating of ____ amps. | 20, 15
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| 14. Name two types of failures associated with control relays. | operator failure, contact failure
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| 15. IEC relay coils are identified as ___ and ___. IEC contacts are identified by two numbers, the ___ number and the contact ___. | A1, A2 , contact, type
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Created by:
JoshHampton