ac motor pump control using microcontroller ?

[vead]

Hello
I need help. can we control ac motor pump using microcontroller ? If yes then how to control ac motor pump? what I need , relay or motor driver Ic. motor pump run for 3 minute than turn off for 2 minute, do the task continuously

 

[Harald Kapp]

A suitable relay is a good starting point. It is a safe nethod as the relay isolates the power circuit from the control circuit. Lifetime of the circuit will b esomewhat limited due the limited number of switching cycles a mechanical relay has.
A solid state relay (SSR) is an alternative which doesn't suffer such limitations.

 

[ADRT]

Some of the wood pellet stove controllers I have worked on use a TRIAC isolated from the microcontroller by an opto-isolator to turn on the feed auger for preset periods depending on what setting the stove is on. They also use them to control the fan speeds as well.

 

[Harald Kapp]

TRIAC isolated from the microcontroller by an opto-isolator

That is essentially a solid state relay, though it may be realized discretely, not as a single component.

 

[GPG]

http://www.vishay.com/docs/83627/il410.pdf

 

[vead]

there are many type of relay's which one select to control 0.5 H water pump

 

[Harald Kapp]

there are many type of relay's which one select to control 0.5 H water pump

One that fits:

• max. current required by the motor/pump (with some spare for a safety margin)
• max. operating voltage (with some spare for a safety margin)
• your purse (with some spare to support living)

 

[vead]

One that fits:

• max. current required by the motor/pump (with some spare for a safety margin)
• max. operating voltage (with some spare for a safety margin)
• your purse (with some spare to support living)

pump motor
SPECIFICATIONS:

• Power rating : 0.37kW/0.5 Hp
• Pipe Size : 25*25 Suction & Delivery
• Voltage range : 180 to 240 Volts
• Head : 6 to 28 meters

please look at Relay http://www.shopclues.com/relay-12v.html?gclid=CNXUxJWvxsgCFVgVjgodLvoD9w&gclsrc=aw.ds

Is it suitable for that pump motor ?

 

[Harald Kapp]

You have all the data of the motor, compare with the data of the relay. Where is your doubt?

 

[vead]

You have all the data of the motor, compare with the data of the relay. Where is your doubt?

I just asked for confirmation and safety. I have no doubt, the specification of relay match with pump water requirement

 

[Bluejets]

1/2hp single phase motor about 5 or 6 amp full load....allow 4 to 6 times starting instantaneous current so 20 amp relay should do fine.

 

[vead]

http://blowtech.blogspot.in/2013/08/relay-concept-in-8051-microcontroller.html
In this link ,there is transistor and resistor connected with 8051. I have doubt, can we interface relay directly to 8051 port ,or I have to use resistor , transistors , other Ic ?

 

[Harald Kapp]

can we interface relay directly to 8051 port

This is not recommended due to current consumption and possible flyback voltage from teh relay coil. Use a transistor in between.

 

[Minder]

I would tend to use a 2n7000 for Q1, also for that small a relay you may want to use a R/C snubber across the contacts.
M.

 

[vead]

how to interface the Relay to microcontroller (8051)?
Relay has 5 pins I don’t understand how to interface relay to 8051.I found below image. I think I have to do same as showing in circuit
pin 2 connected to port pin of mcu
pin 3 connected to ground

where to connect two wire of water pump ?

 

[Minder]

Using the 2n7000 imposes no load on the μp port, it is designed to interface with 5v circuitry.
M.

 

[vead]

Using the 2n7000 imposes no load on the μp port, it is designed to interface with 5v circuitry.
M.

which transistor I have to used to interface relay to mcu , also where to connect two wires of motor?

 

[Minder]

As mentioned, 2n7000
The motor is fed direct with the neutral and the live conductor is switched by one pair of N.O. contacts. Live in - motor out.
See fig 2 you can eliminate the LED and resistor if not needed.
M.