Forum >Relay shield for arduino 230V 50Hz 1A 210W
Relay shield for arduino 230V 50Hz 1A 210W
Jonsav 2012-04-12 06:00:43 7298 Views5 Replies Hi
Can I control a blind motor with relays of shield? It works with 230V 50Hz, 1A for 210W.
Thanks
Can I control a blind motor with relays of shield? It works with 230V 50Hz, 1A for 210W.
Thanks
2012-05-04 19:46:25 Hi Sakari,
On the contrary, thanks for posting! Great to get more input on the topic. I hope Antonio can see this. Hector
On the contrary, thanks for posting! Great to get more input on the topic. I hope Antonio can see this.
Hector 2012-05-04 05:49:46 Hi,
[quote="Jonsav"]
Can I control a blind motor with relays of shield? It works with 230V 50Hz, 1A for 210W.
[/quote]
Well 1A at 230V is actually 230W. Let's just assume that the motor takes 230W. And that is AC motor (as you mentioned the frequency.)
Then let's see what the datasheet of the relay board says.
[quote]
Max Switching Voltage AC 240V / DC 60V
Max Switching Current 5A
Max Switching Power AC 360VA / DC 90W
[/quote]
This means that if you connect DC load to the relay, it must be no more than 60V, 5A OR 90W. So, imaginary 100V 50W (DC) gadget should not be connected, as 100>60.
Spesification for alternating current load is 240V, 5A and 360VA. If you haven't been sleeping in the physics lessons, you should know that VA = V*A = W.
So back to your case, where you want to control 230V, 1A, 230W AC motor with this relay.
230V < 240V
1A < 5A
230W < 360VA
So this means, yes you can. And the relay could actually take 130W more load, but it's just good to have some headroom here.
However, please check my calculations and prove if im wrong. I couldn't find the relay's datasheet, so my calculations are done with the spesification on the [url=https://www.dfrobot.com/wiki/index.php?title=Relay_Shield_for_Arduino_(SKU:DFR0144)]shop page[/url]. Also, be aware of risks of high voltages.
[quote="Hector"]
I'm not sure how you get 360VA=270W. I didn't know there was a conversion for this.
[/quote]
That calculation is wrong. But as I said, W = A * V.
[size=6pt](Sorry If I dug an old topic up, if you don't tolerate that here please let me know. And send the answer to Antonio if you are evil enough to remove my post...)[/size]
--
Sakari. Sakari
[quote="Jonsav"]
Can I control a blind motor with relays of shield? It works with 230V 50Hz, 1A for 210W.
[/quote]
Well 1A at 230V is actually 230W. Let's just assume that the motor takes 230W. And that is AC motor (as you mentioned the frequency.)
Then let's see what the datasheet of the relay board says.
[quote]
Max Switching Voltage AC 240V / DC 60V
Max Switching Current 5A
Max Switching Power AC 360VA / DC 90W
[/quote]
This means that if you connect DC load to the relay, it must be no more than 60V, 5A OR 90W. So, imaginary 100V 50W (DC) gadget should not be connected, as 100>60.
Spesification for alternating current load is 240V, 5A and 360VA. If you haven't been sleeping in the physics lessons, you should know that VA = V*A = W.
So back to your case, where you want to control 230V, 1A, 230W AC motor with this relay.
230V < 240V
1A < 5A
230W < 360VA
So this means, yes you can. And the relay could actually take 130W more load, but it's just good to have some headroom here.
However, please check my calculations and prove if im wrong. I couldn't find the relay's datasheet, so my calculations are done with the spesification on the [url=https://www.dfrobot.com/wiki/index.php?title=Relay_Shield_for_Arduino_(SKU:DFR0144)]shop page[/url]. Also, be aware of risks of high voltages.
[quote="Hector"]
I'm not sure how you get 360VA=270W. I didn't know there was a conversion for this.
[/quote]
That calculation is wrong. But as I said, W = A * V.
[size=6pt](Sorry If I dug an old topic up, if you don't tolerate that here please let me know. And send the answer to Antonio if you are evil enough to remove my post...)[/size]
--
Sakari.
Sakari 2012-04-13 18:45:59 Hi Antonio,
No, I really don't think these relays are strong enough to handle the 210Watts. No5. states 360VA OR 90Watts
I'm not sure how you get 360VA=270W. I didn't know there was a conversion for this.
Hector
No, I really don't think these relays are strong enough to handle the 210Watts. No5. states 360VA OR 90Watts
I'm not sure how you get 360VA=270W. I didn't know there was a conversion for this.
Hector 2012-04-12 23:51:30 Thanks for the reply Hector.
Into relay's data sheet I see:
5. Max Switching Power AC 360VA / DC 90W
It means 90W for DC and 360VA for AC, right? So, my case is AC and I think that 360VA is equivalent to 270W, or I'm wrong?
Thanks.
Antonio Jonsav
Into relay's data sheet I see:
5. Max Switching Power AC 360VA / DC 90W
It means 90W for DC and 360VA for AC, right? So, my case is AC and I think that 360VA is equivalent to 270W, or I'm wrong?
Thanks.
Antonio
Jonsav 2012-04-12 17:55:15
I think you wont be able to. The Power consumption of the motor is too large. 210W, the stated switching power for the relay is only 90W. You need to find a relay that is capable of handling the voltage, current, and power of your motor.
Please double check the relay's data sheet and specifications. Please be careful.
[url=https://www.dfrobot.com/wiki/index.php?title=Relay_Shield_for_Arduino_(SKU:DFR0144)]https://www.dfrobot.com/wiki/index.php?title=Relay_Shield_for_Arduino_(SKU:DFR0144)[/url] Hector
I think you wont be able to. The Power consumption of the motor is too large. 210W, the stated switching power for the relay is only 90W. You need to find a relay that is capable of handling the voltage, current, and power of your motor.
Please double check the relay's data sheet and specifications. Please be careful.
[url=https://www.dfrobot.com/wiki/index.php?title=Relay_Shield_for_Arduino_(SKU:DFR0144)]https://www.dfrobot.com/wiki/index.php?title=Relay_Shield_for_Arduino_(SKU:DFR0144)[/url]
Hector 