I've got a 3 phase mag starter that runs on 120v coil with a stop/start station. Off of this stop/start I need to run a on delay relay that turns a solinoid on, then when you push the stop, this solinoid needs to close and the motor needs to run on a off/delay relay. The problem I have is seperating this on and off delay. Do I need a aux. contact on the starter to seperate these two relays so one will turn off the solinoid and the other will run the motor for the additional 30 seconds.
120v control problem
- Thread starter blackburn
- Start date
- Status
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Re: 120v control problem
What I would do is build a separate enclosure with the required relay logic and delay timers to do what you want to do. This would interface with the start/stop station, the motor starter and the solenoid. If I'm reading your explanation right, what you want to do is going to require more than just an auxiliary contact on the starter and you are going to need a place to install other relays.
What I would do is build a separate enclosure with the required relay logic and delay timers to do what you want to do. This would interface with the start/stop station, the motor starter and the solenoid. If I'm reading your explanation right, what you want to do is going to require more than just an auxiliary contact on the starter and you are going to need a place to install other relays.
Re: 120v control problem
I have the on delay and off delay timers installed in a seperate can. the trouble i'm having is when the off is pushed how do you keep the motor on the off delay relay w/o starting the whole seq. again. in other words when the starting coil and n/o contacts are closed the relay for the on delay comes on also
I have the on delay and off delay timers installed in a seperate can. the trouble i'm having is when the off is pushed how do you keep the motor on the off delay relay w/o starting the whole seq. again. in other words when the starting coil and n/o contacts are closed the relay for the on delay comes on also
jtb
Senior Member
- Location
- Pennsylvania
Re: 120v control problem
I am with Bennie on this one.
A sketch would help here.
Have you tried using the N/C contacts...
I am with Bennie on this one.
A sketch would help here.
Have you tried using the N/C contacts...
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: 120v control problem
Don't use a "normally closed" stop button contact. Use a normally open contact on the stop button to control the "off delay" timer. An open contact (NOTO) from the timer can then be wired in parallel with the normal control contact (just like a holding circuit interlock).
Of course you may want to have an E-Stop in front of everything in order to trun the motor off immediately.
Don't use a "normally closed" stop button contact. Use a normally open contact on the stop button to control the "off delay" timer. An open contact (NOTO) from the timer can then be wired in parallel with the normal control contact (just like a holding circuit interlock).
Of course you may want to have an E-Stop in front of everything in order to trun the motor off immediately.
Ed MacLaren
Senior Member
Re: 120v control problem
Here are a couple of circuits that I think will work, if I understand correctly what you need to accomplish.
Circuit A provides for "push button" E-Stop.
Circuit B will do if your Off-delay relay has an instantaneous (non-timed) contact, and you don't need the push button E-Stop feature.
Ed
Here are a couple of circuits that I think will work, if I understand correctly what you need to accomplish.
Circuit A provides for "push button" E-Stop.
Circuit B will do if your Off-delay relay has an instantaneous (non-timed) contact, and you don't need the push button E-Stop feature.
Ed
pierre
Senior Member
- Location
- Westchester County, New York
Re: 120v control problem
Ed
Ed the drawings are just what we need, great job.
Thanks
Pierre
Ed
Ed the drawings are just what we need, great job.
Thanks
Pierre
Re: 120v control problem
Quote
[BDo I need a aux. contact on the starter to seperate these two relays so one will turn off the solinoid and the other will run the motor for the additional 30 seconds.
B]
Dwg B
The drawings looks great. Stop button is pushed T1 and T2 begins the timed cycle. He wants the motor to run 30 seconds after the Sol relay is denergized. It sounds like T1 need to have additional 30 sec longer that T2. I like Dwg B better. It is less to built and simpler to follow
and only one Stop Button involved. After reading the post again it sounds like he wants the sol denergized as soon as he hits the off button. If so a time delay not required. I may be reading this incorrectly
[ July 07, 2003, 01:55 PM: Message edited by: bob ]
Quote
[BDo I need a aux. contact on the starter to seperate these two relays so one will turn off the solinoid and the other will run the motor for the additional 30 seconds.
B]
Dwg B
The drawings looks great. Stop button is pushed T1 and T2 begins the timed cycle. He wants the motor to run 30 seconds after the Sol relay is denergized. It sounds like T1 need to have additional 30 sec longer that T2. I like Dwg B better. It is less to built and simpler to follow
and only one Stop Button involved. After reading the post again it sounds like he wants the sol denergized as soon as he hits the off button. If so a time delay not required. I may be reading this incorrectly
[ July 07, 2003, 01:55 PM: Message edited by: bob ]
Ed MacLaren
Senior Member
Re: 120v control problem
The way I read it, he wants the the motor to start when the start button is pressed, and the solenoid to be energised after a time delay. The on-delay relay does this.
When the stop button is pressed, he wants the solenoid to be de-energised, and the motor to continue to run for 30 secs, as per the timing chart below.
blackburn, does that sound like what you want?
Ed
The way I read it, he wants the the motor to start when the start button is pressed, and the solenoid to be energised after a time delay. The on-delay relay does this.
When the stop button is pressed, he wants the solenoid to be de-energised, and the motor to continue to run for 30 secs, as per the timing chart below.
blackburn, does that sound like what you want?
Ed
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