Jump to content
Electronics-Lab.com Community
Sign in to follow this  
xiaobai00

i need help of this Relay circuit.

Recommended Posts

need help from u guys, please. A million thanks if can help. =(

i have problems of this circuit layout.

1) what's the purpose for dotted line between pin 12 to 11? But the ic is ULN2003. Is the dotted line meant to be repeated the circuit as in pin 10?
2) Is the relay RL7 example is included with the switch (S7)?
3) Do relays have ohms reading, example 200ohm, 12V? I dont understand well, sorry.
4) What is the meaning of N and PH bottom of the image?

picture1xi7.jpg

Share this post


Link to post
Share on other sites

The dashed lines indicate that two sets of contacts operate "together". In other words, looking at the "appliance#7" part of the circuit in question, the contacts on the right and the contacts on the left are part of the same relay. For instance, both sets of contacts in a DPDT relay. The dashed lines going from the coil of "RL7" to the contacts above it are to signify that those contacts are operated by that coil, if I'm not mistaken.

As for the "N" and "PH" at the lower right, I believe they would stand for "Neutral" and "PHase".

Share this post


Link to post
Share on other sites

The last reply is partially correct in that the lines horizontally mean the contacts move together. The original question was not this.

The lines you are asking about indicate that the contacts are activated by the coil that the dashed lines are pointing at. This is very common in schematics where the contacts may be drawn in one place and the circuit that activates the coil is somewhere else.

Share this post


Link to post
Share on other sites

LostViking, I said that, if you had read my entire post.

To answer the rest of the original question, "S7" would enable you to 'disable' "RL7" by opening it's common connection, thus preventing it from operating. Also, yes, relays are sometimes rated by the resistance or reactance, both measured in "Ohms", of their coil. Use Ohm's law to determine what resistance/reactance can be used at what voltage levels.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...