Help to interface MOSFET SSR

Thread Starter

champ1

Joined Jun 4, 2018
136
I am trying to interface mosfet SSR and solenoid with 8051

Here is detail of mosfet SSR https://www.indiamart.com/proddetail/5amp-model-704-dc-to-dc-mosfet-ssr-20061643930.html

Specifications:
  • DC Output Switching SSR - POWER MOSFET
  • Input : 3-32VDC, 4-16mA
  • Input Green LED indication
  • Output : 5-200VDC - 5 Amp
  • I/P. to O/P. insulation : 2.5kV for 1min
  • Turn ON time : 2.5 mS
  • Turn OFF time : 40 μS
  • ON State Voltage Drop :

Aeroflex Single Solenoid Valve, V4-08
detail of soleniod valve https://www.indiamart.com/proddetail/aeroflex-single-solenoid-valve-v4-08-10612103662.html


  • Coil Voltage - 230 V AC, 24 V DC, 110 V AC BSP Thread Solenoid Valve 3X2 PORT IN

Here is my connection

upload_2019-1-4_11-19-38.png

I have doubt connection between Mosfet relay and solenoid valve ,

please, somebody, help me
 

LesJones

Joined Jan 8, 2017
3,816
You don't seem to have any power source to supply the solenoid valve. In your diagram the mosfet switch output of the SSR is just shorting out the coil in the solenoid valve. It is just like shorting the two connections on a light bulb together and expecting it to light.

Les.
 

LesJones

Joined Jan 8, 2017
3,816
Connect the power supply negative to the pin 4 of the SSR.
Connect the power supply positive to the control valve positive.
Connect the control valve negative to pin 3 on the SSR.
This brakes the negative supply to the valve. You could also use the SSR to brake the positive supply to the valve if you prefer.

Les.
 

Thread Starter

champ1

Joined Jun 4, 2018
136
Connect the power supply negative to the pin 4 of the SSR.
Connect the power supply positive to the control valve positive.
Connect the control valve negative to pin 3 on the SSR.
This brakes the negative supply to the valve. You could also use the SSR to brake the positive supply to the valve if you prefer.

Les.
tried this connection but a valve is not operating
upload_2019-1-10_18-10-6.png
 

LesJones

Joined Jan 8, 2017
3,816
According to the link in your first post the input terminals are 3 and 4 and the output terminals are 1 and 2, I had followed the numbering in your post #4.

Les.
 

danadak

Joined Mar 10, 2018
4,057
Depending on 8051 version you are using the data line to the SSR should have a
pull down on it, say 5-10K ohms. To hold SSR off while 8051 powering up and its
outputs in tristate. This depends on 8051 as there were "enhanced" versions in
industry with various capabilities.

Look in data sheet to see if 8051 guarantees glitch free known state on GPIO on
power up. If its not glitch free that produces another problem, as pulldown only
fixes the output in tristate issue, not glitches. For that you need additional circuitry
to handle.

Regards, Dana.
 

Alec_t

Joined Sep 17, 2013
13,159
Have you verified that you have been supplied with the 24V version of the valve? The write-up covers mains voltage versions as well.
 

Thread Starter

champ1

Joined Jun 4, 2018
136
According to the link in your first post the input terminals are 3 and 4 and the output terminals are 1 and 2, I had followed the numbering in your post #4.

Les.
Hi LesJones
I am not using 8051 yet. I have tested with two power supply
Look at post #6.
There is one 5V DC supply , 24V DC supply , SSR and Valve.

What could be wrong in connection in post #6
 

LesJones

Joined Jan 8, 2017
3,816
As I said in post #7 you have the input and output terminals mixed up. The input connections are 2 & 4 according to the data sheet. the output terminals are 1 & 2. I had just followed your pin numbering in post #4 when I described how to connect it in post #5 It was only after your post #6 that I looked at the data sheet.

Les.
 

Thread Starter

champ1

Joined Jun 4, 2018
136
As I said in post #7 you have the input and output terminals mixed up. The input connections are 2 & 4 according to the data sheet. the output terminals are 1 & 2. I had just followed your pin numbering in post #4 when I described how to connect it in post #5 It was only after your post #6 that I looked at the data sheet.

Les.
Thanks LesJones
 

jayanthd

Joined Jul 4, 2015
945
Connect a 500R 1/4W between 8051's Digital output pin and SSR +input pin (+1). Connect -2 pin to GND.

Connect +3 and -4 pins as shown in post #6.

The 500R resistor will limit the current to 10mA.
 
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