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Motor Control ch 2

Manual Pilot Devices

QuestionAnswer
1. Manually-operated pilot devices are actuated by a ____ operator. Human
2. The following diagram illustrates a ___ pole ___ throw switch. double double
3. Double break contacts have a ___current rating than single break contacts of the same size. higher
4. A switch contact which changes states when actuated, but returns to its initial state when the actuation is removes, is called a ___ operator. momentary
5. Draw the NEMA symbol for a single pole normally open (NO) pushbutton switch.
6. Draw the IEC symbol for a single pole normally closed (NC) pushbutton switch.
7. Identify each pushbutton operator on page 6 or workbook
The two parts of a pushbutton switch are the ___ and the ___. operator, contact block
9. In motor control operations that require quick operator interaction, utilize a _____-type pushbutton switch. mushroom
10. When installing pushbuttons or selector switches, ___ type operators are generally installed in 30.5 mm openings, while ____ type operataors are generally installed in 16 mm or 22.5 mm openings. NEMA IEC page 20
11. ___-(how many) position selector switches with maintained contacts are the most common type of selector switch. 2
12. A typical HAND-OFF-AUTO control operation typically requires a ____(how many) position selector switch with ___ (how many) contacts. 3 , 2
13. Draw and label the NEMA sybols for both a two-position (OFF-ON) selector switch and a three- position (HAND-OFF-AUTO) selector switch.
14. The ___ switch is a three-position switch that can be used to manually change the direction of rotation of a three-phase motor. drum switch
15. Identify the following switch symbol. page 7
16. How many contacts would be required for a joystick switch used to move a crane if the crane required the following operations: UP, DOWN,LEFT, and RIGHT? 4
17.Name three types of lamps used in visual signaling devices. incandescent lamp, LED, xenon(strobe) tube
18. Draw the symbol for an IEC pilot lamp.
19. A ___ pilot light allows up to four lamps in a single pilot light. cluster
20. Which two types of visual indicators are normally associated with a hazard problem or a proceed-with-caution indication? rotating or flashing lights
21. What type of visual indicating device allows the lamp to be tested by pressing the lens of the indictor? push to test
22. A ___indicator or ___ light allows multiple indicators and signaling devices to be assembled in a column. tower indicator or stock light
23. Which type of audible signaling device has maximum sound output of 108 dB? general purpose horn
24. What are the two categories of switch failures? operator problems and contact problems
25. ____ control devices are designed for control of systems where failure free operation of the control system is of primary concern. safety
Created by: JoshHampton
 

 



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