I bought this voltage regulator from Aliexpress. There are no instructions on how to wire it up.
After 4 days of sending messages To them I have not had a single reply back.

Thank you in advance to anybody who Can give me advice on the wiring of this.

There are 4 connectors numbered 1 to 4 starting on the left with 1 and finishing on the right with 4.
Looking at the underside of the circuit board In the picture on the far right, it shows 2 and 3 directly connected and 1 And 4 Connected via the circuit board.
I'm not an electrician in any way can anybody give me any ideas on how to wire this up?

I'm attaching it to a blender I have the positive and negative feed From the mains and the positive and negative feed to the motor.
I also have the earth and nowhere to attach it to.

If I wire this up the wrong way round can I destroy the circuit board?


https://www.aliexpress.com/item/400...der_detail.order_detail_item.2.1d93f19c6X4bvG

 

It would appear that two are 240vac supply and the other two the load, the two centre terminals appear to be common, so the outer two are input and output, both connected to a pin on the Triac device, So some tracing/reverse engineering of the circuit is needed in order to find out which of the outer two are in/out , keep in mind there is no galvanic isolation of this circuit and no earth GND
So keep in mind that as it stands it is a potential safety hazard.

 

It would appear that two are 240vac supply and the other two the load, the two centre terminals appear to be common, so the outer two are input and output, both connected to a pin on the Triac device, So some tracing/reverse engineering of the circuit is needed in order to find out which of the outer two are in/out , keep in mind there is no galvanic isolation of this circuit and no earth GND
So keep in mind that as it stands it is a potential safety hazard.

thank you for helping. Do you think that there is a chance that I I will ruin the circuit board by just trying different combinations to see which one works properly?

 

I see you are in the UK, so you would connect the neutral to the centre (common) terminals.
Can you give the No. off of the device mounted on the heatsink.?
The earth connection should at least be connected to the frame of the device (blender), unless this is a double insulated version.

 

Terminals are ::
1) Motor Live
2) Motor Neutral
3) Mains Neutral
4) Mains Live
If you reverse the Lives it won't work, it looks like a Triac on the heatsink controlled by an optocoupler.

 

Terminals are ::
1) Motor Live
2) Motor Neutral
3) Mains Neutral
4) Mains Live
If you reverse the Lives it won't work, it looks like a Triac on the heatsink controlled by an optocoupler.

Thank you.
If I wire it wrong will it break the circuit board?

 

Thank you.
If I wire it wrong will it break the circuit board?

If you wire it other than what i posted, then yes you might damage the tracks, but you you won't blow the board up.

 

If you wire it other than what i posted, then yes you might damage the tracks, but you you won't blow the board up.

thank you for letting me know

 

Terminals are ::
1) Motor Live
2) Motor Neutral
3) Mains Neutral
4) Mains Live
If you reverse the Lives it won't work, it looks like a Triac on the heatsink controlled by an optocoupler.

Thank you
Just to check I may have caused some confusion in my original post. As I also talked about the back of the board.

There are 4 connectors numbered 1 to 4 starting on the left with 1 and finishing on the right with 4.

This is with the board the right way up where you can see all of the components.

Are the connections still the same as you said?

 

Thank you
Just to check I may have caused some confusion in my original post. As I also talked about the back of the board.

There are 4 connectors numbered 1 to 4 starting on the left with 1 and finishing on the right with 4.

This is with the board the right way up where you can see all of the components.

Are the connections still the same as you said?

On the photo the terminals are numbered 1 to 4, ( left to right component side) the centre two are Neutral and joined together, if you get terminals 1&4 the wrong way it won't work.

 

On the photo the terminals are numbered 1 to 4, ( left to right component side) the centre two are Neutral and joined together, if you get terminals 1&4 the wrong way it won't work.

Thank you I will wire this all up tomorrow. You been very helpful.

 

Terminals are ::
1) Motor Live
2) Motor Neutral
3) Mains Neutral
4) Mains Live
If you reverse the Lives it won't work, it looks like a Triac on the heatsink controlled by an optocoupler.

Are you sure about that? Conventional phase control looks like:



MT2 is pin 2 of the TOP3 Triac case. MT1 is pin 1, gate is pin 3. Hopefully its an isolated TOP3 else the heat-sink is potentially LIVE!

I would have expected the neutral to screw 1, live to screw 2 and the motor to screw 3 and 4 (live on 3)

 

Thank you everyone for your help. I am not sure if it is helpful here is similar machine in two picture it is one way but in the third it is reversed - I think it is the same board as mine, but with a turning control knob rather than a press button

 

Picture1 is exactly the way I've suggested, as shown on the left below.This is the, arguably, more conventional arrangement for motors, putting the controller on the neutral side of the motor.

Picture 3 is reversed, as you said, but actually will work. As shown on the right below it puts the triac 'upside-down', but still on the neutral side of the motor.





My biggest concern is the lack of any protective earth on the unit. This whole unit, including the control panel, must be installed in a ventilated metal box which is connected to the protective ground (green/yellow in UK).

 

Picture1 is exactly the way I've suggested, as shown on the left below.This is the, arguably, more conventional arrangement for motors, putting the controller on the neutral side of the motor.

Picture 3 is reversed, as you said, but actually will work. As shown on the right below it puts the triac 'upside-down', but still on the neutral side of the motor.


View attachment 289159


My biggest concern is the lack of any protective earth on the unit. This whole unit, including the control panel, must be installed in a ventilated metal box which is connected to the protective ground (green/yellow in UK).

thank you for this. You are right some of these seem to have a metal box and others not. It seems that all have to buy another one with a metal box and a turning knob.
If I were to connect this to a blender all of the workings would be inside the blender and then the press button pad would be on the outside. But as you say it would not be earth. I'm not sure how they legally managed to sell this.

 

Are you sure about that? Conventional phase control looks like:

View attachment 289150

MT2 is pin 2 of the TOP3 Triac case. MT1 is pin 1, gate is pin 3. Hopefully its an isolated TOP3 else the heat-sink is potentially LIVE!

I would have expected the neutral to screw 1, live to screw 2 and the motor to screw 3 and 4 (live on 3)

Ok so just swap the Lives and Neutral round, put the lives in the middle on pins 2&3, and the mains Neutral on pin 1 , Motor Neutral on pin 4.
That way the heatsink will be at Neutral potential if it's not isolated, ideally it should be in a enclosed case.

 

I'm not sure how they legally managed to sell this.

It's CHINA, They do it all the time!

 

It's CHINA, They do it all the time!

Probably doesn't have a CE mark (or if it does its fake)