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Unread 15-02-2010, 07:49
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Mike Betts Mike Betts is offline
Electrical Engineer
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Join Date: Dec 2001
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Location: Homosassa, FL
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Re: Limit Switch Draws Tears

Quote:
Originally Posted by gokul View Post
...Make sure your switch itself is a normally Open type switch Switches come as Normally Open and Normally Closed - closed will always show one unless it is operated in a different way...
Not true. "Normally" only reflects the position of the contacts when the switch is not pressed. A NO switch will close when pressed, a NC switch will open.

There are many times when you want a NC switch. This is particularly true of limit switches. If a wire breaks and the switch is no longer "in the circuit" you want the motor or actuator that you are limiting to stop. This is usually much safer...

Regards,

Mike
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Mike Betts

Alumnus, Team 3518, Panthrobots, 2011
Alumnus, Team 177, Bobcat Robotics, 1995 - 2010
LRI, Connecticut Regional, 2007-2010
LRI, WPI Regional, 2009 - 2010
RI, South Florida Regional, 2012 - 2013

As easy as 355/113...