I need a time relay and i want one which i can easily test. Do time relays exist with a test push button in front, just like a normal contactor.??

 

How long a delay?
What's the voltage and current?

 

Should be possible to add a small P.B. to a timer circuit if needed.
What is the reason for needing to test it?
Max.

 

Should be possible to add a small P.B. to a timer circuit if needed.
What is the reason for needing to test it?
Max.

It would be nice to test the contacts of a time relay, just as a normal contactor,.without having to put voltage on the relay. Just like a contactor, where you can push on the front side to press the contacts to test them, do time relays exist where you can also press in front to test the contacts??

 

How long a delay?
What's the voltage and current?

It would be nice to test the contacts of a time relay, just as a normal contactor,.without having to put voltage on the relay. Just like a contactor, where you can push on the front side to press the contacts to test them, do time relays exist where you can also press in front to test the contacts??

 

Pushing the contacts over manually on most timers can be difficult as they usually employ a standard sealed relay.
There are sealed plug in relays out there with a manual O.R./test button, but you most likely would have to custom build the timer in order to take advantage of this type.
I don't recall ever seeing a commercial one.
Max.

 

Pushing the contacts over manually on most timers can be difficult as they usually employ a standard sealed relay.
There are sealed plug in relays out there with a manual O.R./test button, but you most likely would have to custom build the timer in order to take advantage of this type.
I don't recall ever seeing a commercial one.
Max.

Many thanks Max. But how do you test a normal sealed timer relay? Let's say a timer relay that switches a motor from star to delta. If the motor won't go into delta, how do you test the timer relay?? Or do you replace it, because it can't be tested because
it 's sealed.

 

More of the story here!
Timers usually have a indicator on them showing the timing sequence, it can also be done by trouble-shooting/testing with a meter, disable the motor while testing, check output of timer.
If output present, then it is down stream such as motor O/L open etc.
If this is a system that has been operating and is now showing a symptom, this would be the course I would take.
Max.

 

With a timer used to switch a motor from Star or WYE to Delta you likely have two contactors for example M1 and M2 where M2 would be the Delta contactor. Place a lamp across each contactor's coil. After the time in when the switching takes place M2 should become energized and the M2 run lamp should come on. This is based on a WYE / Delta start configuration as shown in this example. Without a drawing of your specific setup this is about all I can suggest.

Ron

 

There are examples of Star/Delta starters here on P62-63 that show with timer. Telemecanique wiring diagrams
Generally the sequence circuit is low voltage so it often can be trouble shot with the 3 ph off.
Max.

 

Many thanks guys. Sorry that it seems like there is double thread. I posted this thread, initially because i only wanted to know if someone has ever seen a time relay with a push/test button, like what a normal contactor has in front. Like Max, all the people i asked said they have never seen one. The other thread is about troubleshooting a time relay.

 

Do you have the present schematic of the system setup? it should be easily possible to trouble shoot with a meter.
Max.

 

Do you have the present schematic of the system setup? it should be easily possible to trouble shoot with a meter.
Max.

Hi Max. Sorry again, i just posted another thread with a schematic, with a timer relay in it. Please reply on the other thread. I want you to reply, i want to hear what you have to say. Many thanks

 

It is better to stay on one thread, now there is another posted, (answered).
Max.

 

Pushing the contacts over manually on most timers can be difficult as they usually employ a standard sealed relay.
There are sealed plug in relays out there with a manual O.R./test button, but you most likely would have to custom build the timer in order to take advantage of this type.
I don't recall ever seeing a commercial one.
Max.

You're very good Max. Everyone i asked, don't recall ever seeing one. They simply don't exist . Thanks

 

The Omron MK series is popular for this feature. They can be fitted with a mechanical feature indicating if the relay is energized and also allow a manual push to test button. I have used them quite a bit because at a glance you know if the relay contacts are made. They also make versions with rather than just a push to test button have a latching type button so a used can actually mechanically latch the relay contacts. Pictured below are a few which use a push button. The orange framework works the contacts. Also the button colors are significant as they signify the coil voltage. Blue is a 24 VDC coil and the Orange is 120 VAC. Also not visible is when viewed from above you can see a flag letting you know if the relay is energized or not mechanically. Many also include an On LED. Pictured are 11 Pin 3PDT versions.



Ron

 

The Omron MK series is popular for this feature. They can be fitted with a mechanical feature indicating if the relay is energized and also allow a manual push to test button. I have used them quite a bit because at a glance you know if the relay contacts are made. They also make versions with rather than just a push to test button have a latching type button so a used can actually mechanically latch the relay contacts. Pictured below are a few which use a push button. The orange framework works the contacts. Also the button colors are significant as they signify the coil voltage. Blue is a 24 VDC coil and the Orange is 120 VAC. Also not visible is when viewed from above you can see a flag letting you know if the relay is energized or not mechanically. Many also include an On LED. Pictured are 11 Pin 3PDT versions.

View attachment 129069

 

They are the ones I indicated in #6 but you would need to design a timer around them.
I still don't know why you would need it!
It is a simple ON-delay timer.
Max.

 

They are the ones I indicated in #6 but you would need to design a timer around them.
I still don't know why you would need it!
It is a simple ON-delay timer.
Max.

Thanks Max. Yes i'm doing a project with two partners and we are going to look if we still need it. If a normal time relay is bad you can easily replace it.

 

Thanks Max. Yes i'm doing a project with two partners and we are going to look if we still need it. If a normal time relay is bad you can easily replace it.

At last, So this IS a new project?
Rather than existing?
Have any of you guys had any Industrial control experience?
Max.