I am implementing an emergency stop that is connected directly to my power supply (shown in my schematic) The E-stop that I am using is a N/C type(Normally closed) and comes with 2 wires, a red wire (positive) and a black wire (negative). I show in the schematic a red wire coming from the E-stop (Component with red oval top and labeled N/C) and connecting to "V+" terminal on the motor power supply. I am wanting to know if this approach is correct and if I need to connect the negative wire anywhere else in the circuit.
Remove the red wire between supply V+ and stepper driver V+
The switch should replace that wire.
Leo..
Yes. The switch won't do anything if it only has one wire connected.
I would put the switch between the + out of the power supply and the + into the stepper driver.
Yes.
You need to be certain the em stop current rating is sufficient for the load you are placing it under if you are switching direct. (ie not via contactor or relay)
Your diagram does not supply the load information.
Em stop tradionally would kill ALL power...ie place in the incoming AC supply.
An Emergency Stop should put the machine into a safe state. Only you know what the machine is doing and what a safe state would be. e.g., if it's holding a 100 ton weight over your head and needs power to stay up, then an E-Stop that shuts off power would be a bad idea!
I would caution that if you're asking questions like "do I need to connect both terminals of a switch for it to work" (paraphrased), then you may have quite a bit of learning before building something that requires a functional Emergency Stop.
I was just thinking about this. My power supply emits 48vdc at 10.5a. My e-stop ith is 10a, ac 660v. Its rated load is 220VAC/6A 380VAC/4A 660VAC/2A 440VDC/0.3A 220VDC/0.5A 110VDC/1A. And can withstand 2500V. Im concerned about the amount of current flowing through the e-stop beacause its rated for 10a and my power supply has 10.5a. What components can i implement in the circuit to make sure that the e-stop does not get current overload?
Max current that flows through the switch is what the stepper driver is set to.
That might only be a few Amps.
Leo..
My power supply emits 48vdc at 10.5a. My e-stop ith is 10a, ac 660v. Its rated load is 220VAC/6A 380VAC/4A 660VAC/2A 440VDC/0.3A 220VDC/0.5A 110VDC/1A. And can withstand 2500V. Im concerned about the amount of current flowing through the e-stop beacause its rated for 10a and my power supply is rated for 10.5a. What components can i implement in the circuit to make sure that the e-stop does not get current overload? (My emergency stop is directly connected to my power supply)
@mrman69, please do not cross-post. Threads merged.
Rubbish.....in an emergency, the em stops the lot....does not wait around until some pasrticular errand is finished or not.....one reason why they are hard wired and not software dependant.
1 Like
1:
Your psu provides 48V at UP TO 10.5A.
You need to provide the spec (ideally a link) for your motor. And the stepper driver.
2: No it isnt. its rated for 1A.
Here are the specs for motor:https://www.automationdirect.com/adc/shopping/catalog/motion_control/stepper_systems/single_shaft_stepper_motors/stp-mtrac-42151
There are different Stop categories. What you are describing is called an "uncontrolled stop." Doing an uncontrolled stop in the situation I referenced could lead to loss of life.
See this: Understanding Stop Categories for Machinery Stopping Functions
2 Likes
The switch is indeed rated for 1A DC, so not wise to put it between supply and driver, which carries 6Amp DC. Better to use the switch in the red wired of the AC plug (on your diagram).
Leo..
1 Like
The emergency switching off circuit is often confused with the emergency stop circuit . The main differences lie in the reaction when the emergency stop or the emergency switching off pushbutton is operated. In the case of the emergency stop, the hazardous movements are stopped. In the case of the emergency switching off , power to the system is switched off , which is a requirement for electrical hazards (electric shock).
If you are doing a stop circuit you need to think about what the motor will then do and what hazard are you trying to prevent .
2 Likes
@
Your other topic on the same subject deleted.
Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.
Please create one topic only for your question and choose the forum category carefully. If you have multiple questions about the same project then please ask your questions in the one topic as the answers to one question provide useful context for the others, and also you won’t have to keep explaining your project repeatedly.
Repeated duplicate posting could result in a temporary or permanent ban from the forum.
Could you take a few moments to Learn How To Use The Forum
It will help you get the best out of the forum in the future.
Thank you.
Well then can u answer my question