Any electrical engineers out there?
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Post Fiend
Joined: Nov 2001
Posts: 7,698
Likes: 4
From: Neenah, Wisconsin
Any electrical engineers out there?
Ok, heres what i have to accomplish. I've got a college R&D project in which i need to rig a timer to turn a small dc motor on 45 seconds after i push a button. I hate electricity....so i'm at a bit of a loss for how to do it. Anyone out there who can help me?
Thanks.
Thanks.
Senior User
Joined: Jan 2003
Posts: 364
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Sounds like you need 2 circuits. You can put the timer after the switch and make it so the 1st circuit will be completed after the switch is made. The timer will then run for 45 seconds after that it will complete the next circuit which will start the motor.
Longneck
Longneck
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
Need a little more info. What is the motor you're running? (voltage and current rating)
As I understand it, you want to run a motor for 45 seconds after you push the button. You can do it all with a 555 timer and a relay. Need the motor info to complete the design.
Barry
As I understand it, you want to run a motor for 45 seconds after you push the button. You can do it all with a 555 timer and a relay. Need the motor info to complete the design.
Barry
Thread Starter
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Post Fiend
Joined: Nov 2001
Posts: 7,698
Likes: 4
From: Neenah, Wisconsin
hum......well.....its about this long.............................................. Lol....i dunno much about the motor, we dug through a bin of them and hooked it up to two AAA batteries...and it ran at about the right speed. any way to figure it out if theres no markings on it.
Posting Guru
Joined: Apr 2000
Posts: 1,746
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From: PNW
Originally posted by BB
As I understand it, you want to run a motor for 45 seconds after you push the button. You can do it all with a 555 timer and a relay.
As I understand it, you want to run a motor for 45 seconds after you push the button. You can do it all with a 555 timer and a relay.
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Junior User
Joined: Mar 2001
Posts: 92
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From: Hamburg, NY
A regular adjustable time delay relay would work. Does your control curcuit need to be DC too? If not this would work fine requiring a regular AC power source for your control circuit to power the relay. You follow? Hope this helps
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Cargo Master
Joined: Aug 2003
Posts: 3,237
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From: Belleville, Ontario
Who the heck said anything about a motor???? J/K. First circuit to power the electric timer that wil trip the second circuit switch placed between the DC power source and the motor. All components are required to be DC or is the timer supposed to be AC?
Posting Legend
Joined: Sep 2001
Posts: 30,255
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Just buy a general purpose timer relay available at any industrial electronic supply house that can be set for delay to ON. interval ON, or delay to OFF, with dip switches and a pot on the end. -Simple solution.
There are several common supply voltages available for the relay, but the cheapest to use is what is coming out of the wall outlet.
Call Electronic Supply at 1-800-669-3752 and ask for a #CNS-35-76 for a 120VAC input model, or a # CNS-35-96 multi voltage 24-240V AC/DC input model. You will need an 11 pin socket for the relay also.
2 Form C (DPDT) Contacts are rated 10A @ 30VDC or 277VAC resistive and 1/2HP @ 250VAC. 1/3HP @ 120VAC. You can drive all kinds of small motors with that.
-EDIT- I see that you have added more specs. buy a couple of 12V batteries and use the -96 model relay. Now if you are graded on other things other than simplicity in the industrial world this may not be the right solution.
Have fun!
This is a college R&D project???
There are several common supply voltages available for the relay, but the cheapest to use is what is coming out of the wall outlet.
Call Electronic Supply at 1-800-669-3752 and ask for a #CNS-35-76 for a 120VAC input model, or a # CNS-35-96 multi voltage 24-240V AC/DC input model. You will need an 11 pin socket for the relay also.
2 Form C (DPDT) Contacts are rated 10A @ 30VDC or 277VAC resistive and 1/2HP @ 250VAC. 1/3HP @ 120VAC. You can drive all kinds of small motors with that.
-EDIT- I see that you have added more specs. buy a couple of 12V batteries and use the -96 model relay. Now if you are graded on other things other than simplicity in the industrial world this may not be the right solution.
Have fun!
This is a college R&D project???
Thread Starter
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Post Fiend
Joined: Nov 2001
Posts: 7,698
Likes: 4
From: Neenah, Wisconsin
Ok...should have mentioned this too. Everything has to run off of dc. It has to be built into a box that is self contained. So...no 120VAC also, the motor must begin to run 45 seconds after pressing the button.
Fleet Owner
Joined: Aug 2001
Posts: 29,941
Likes: 46
From: Drummonds, TN USA
There are relays (commonly available) that, once power is applied have a built in delay circuit for whatever time is required.
They are disposable when/if they fail.
Check your area phone directory for Industrial Suppliers, Electrical Suppliers, etcetera...
You can also cruise the local industrial park(s) and see if there is a warehouse full of micsellanious electrical/electronic STUFF...
I have found tons of that in every city I have been to.
Your specs are:
(Whatever) DC Voltage applied
Number of contact sets
Length of delay
Shop around, I know they are out there!
Better yet: Use your favorite search engine to find: ENERGISE DELAY, DELAYED RELAY, internal delay relay, TIME DELAY RELAY, and so on....
They are disposable when/if they fail.
Check your area phone directory for Industrial Suppliers, Electrical Suppliers, etcetera...
You can also cruise the local industrial park(s) and see if there is a warehouse full of micsellanious electrical/electronic STUFF...
I have found tons of that in every city I have been to.
Your specs are:
(Whatever) DC Voltage applied
Number of contact sets
Length of delay
Shop around, I know they are out there!
Better yet: Use your favorite search engine to find: ENERGISE DELAY, DELAYED RELAY, internal delay relay, TIME DELAY RELAY, and so on....
Last edited by Greywolf; Oct 22, 2003 at 07:21 PM.
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
Originally posted by Mikeman
Couldn't this be done with just one time delay relay (i.e., the time delay is built into the relay) rather than having separate items? I used to build equipment using adjustable time delay relays, but perhaps that is old technology these days.
Couldn't this be done with just one time delay relay (i.e., the time delay is built into the relay) rather than having separate items? I used to build equipment using adjustable time delay relays, but perhaps that is old technology these days.
Anyway, looks like you guys got a handle on it.
Barry