switch off motor with limit switches
switch off motor with limit switches
(OP)
Hi all,
I have a low-speed motorized turntable that I would like to modify by adding a couple of limit switches (maybe reed switches?) that will kill power (120VAC) to the turntable if it hits either switch. Additionally, I would like to have a push button that will let me override the system and restore power to the motor, even though it is actuating one of the limit switches. Maybe a buzzer for the fault condition would be helpful too. This is to prevent damage to the equipment. The operator is not endangered by a failure.
This seems like a very simple application and I’m only building a couple of them. Would a smart relay be appropriate for this? Or is there something else that I should be looking at? Do you have any recommendations on specific manufacturers and models?
Thanks in advance.
Glenn
I have a low-speed motorized turntable that I would like to modify by adding a couple of limit switches (maybe reed switches?) that will kill power (120VAC) to the turntable if it hits either switch. Additionally, I would like to have a push button that will let me override the system and restore power to the motor, even though it is actuating one of the limit switches. Maybe a buzzer for the fault condition would be helpful too. This is to prevent damage to the equipment. The operator is not endangered by a failure.
This seems like a very simple application and I’m only building a couple of them. Would a smart relay be appropriate for this? Or is there something else that I should be looking at? Do you have any recommendations on specific manufacturers and models?
Thanks in advance.
Glenn





RE: switch off motor with limit switches
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: switch off motor with limit switches
The fact that you mention "a couple" of limit switches suggests that you have a motor which can move in either direction.
With that in mind, I'd consider using relays to do the main switching (including direction-control, not just limit sensing). The beauty of this approach is that you can design so each limit switch inhibits travel in one direction only, making it possible to get your turntable off the stops without having to invoke any over-ride systems.
Have a look at the way automotive electric window controls are designed.
I would have thought a smart relay was overkill for a job like this.
A.
RE: switch off motor with limit switches
RE: switch off motor with limit switches
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: switch off motor with limit switches