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i’m looking for this relay


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hotwaterwizard 
Silver - Posts: 1,350
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Joined: December 11, 2003
Location: California, United States
Posted: September 08, 2008 at 1:20 AM / IP Logged  

OOPS wrong Diagram

i’m looking for this relay - Page 2 -- posted image.

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
n2ixk 
Member - Posts: 22
Member spacespace
Joined: September 04, 2008
Location: New Jersey, United States
Posted: September 08, 2008 at 8:47 AM / IP Logged  
The circuit will work the same whether you use NO or NC control switches. The only difference is that with NC switches, the 2 relays will be pulled in all the time, and the actuator leads will rest at 12V rather than ground when idle. Good engineering design would dictate the use of NO switches to prolong the life of the relays, and keep the actuator unpowered unless running.
Better quality linear actuators will incorporate a pair of NC limit switches to set the limits of travel. If you have these, put the limit switch contacts in series with the NO control pushbuttons (one limit in series with each button). This way, when the motor hits the end of stroke in one direction, it automatically drops out the relay powering the motor in that direction. The motor will then stop until the opposite button is pressed.
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