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Altering my load control circuits	Add to Hotlist
By hall99m, Section Controls Posted on Sat Jan 21st, 2006 at 07:21:49 PM MST
I am wondering if I can alter my heating load control circuits.

I use Hugh Piggots triac heat control circuits to regulate the power from my 1kw windmill. Each circuit can only switch one phase so to switch a three phase load I need two circuits. I am wondering if there is a way to get one circuit to switch two phases?
Hall99m.

Altering my load control circuits | 9 comments (9 topical, 0 editorial) | Post A Comment

Re: Altering my load control circuits (3.00 / 0) (#1)
by Nando (nando37-at-comcast-dot-net) on Sat Jan 21st, 2006 at 01:06:04 PM MST
(User Info)

Yes you can do such a thing.

I need to see the circuit you are using to be able to tell you any modifications you may need to do.

Can you send to me the schematic of the circuit ?.

My address is in the head of the message.

Nando

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Re: Altering my load control circuits (3.00 / 0) (#2)
by hall99m on Sat Jan 21st, 2006 at 05:49:53 PM MST
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You should be able to see the circuits from the following address,

http://www.scoraigwind.com/circuits/index.htm

The circuit I wish to alter is the one on the right.

Hall99m.

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Re: Altering my load control circuits (3.00 / 0) (#3)
by Nando (nando37-at-comcast-dot-net) on Sat Jan 21st, 2006 at 08:41:41 PM MST
(User Info)

Simple additional circuitry.

I have to describe the changes because the drawing software is in another computer with a crashed hard disk.

For each additional phase loaded add: One switching transistor and all the parts below the emitter of it, (330R, LED, Optocoupler resistors and the TRIAC)

Disconnect the gate of the transistor you have NOW from the output of the amplifier

Place 1000 ohms resistor from the amplifier output to the disconnected gate of the switching transistor.

Place a 1000 ohms resistor from the output of the amplifier to each of the ( one or two ) new transistor gates.

Make sure that the TRIAC circuit, from the opto-coupler pins 4&6, resistors & wiring, is isolated from the other phases -- I presume that you have a star configuration.

Heat sink the new Triacs the same way as the one you now have -- make sure that they are electrically isolated from each other.

Remember that each additional phase consumes around 18-20 milliamps when ON, the supply should be able to carry that extra current.

If you do not want to use additional LEDs then the 330 ohms resistor should be changed to 430 or 470 ohms. The LEDs will give you indication that the circuit is ON and OFF when it is off or the circuit is open when other LED is ON.

Opto coupler short circuiting indicator requires additional detecting circuitry.

Regards

Nando

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Re: Altering my load control circuits (3.00 / 0) (#4)
by willib (willibur at comcast dot net) on Sat Jan 21st, 2006 at 09:03:17 PM MST
(User Info) http://www.njwind.com/webcam.html#

it says on the page you have there, that you can connect the optocoupler inputs in series , to drive seperate triacs. i take this to mean that you could use it on all three phases..
inputs 1 & 2 are just diodes that need their current limited to 30 mA by the 330 ohm resistor..but their maximum is 60mA but best try to keep it near 30mA..

http://www.datasheetcatalog.com/datasheets_pdf/M/O/C/3/MOC3061.shtml

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Re: Altering my load control circuits (3.00 / 0) (#5)
by hall99m on Sun Jan 22nd, 2006 at 06:25:03 AM MST
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I think you are corrcet about connecting the opto coupler inputs in series, I will try altering my circuitry this way, thanks.

Hall99m.

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Re: Altering my load control circuits (3.00 / 0) (#6)
by Nando (nando37-at-comcast-dot-net) on Sun Jan 22nd, 2006 at 07:37:27 AM MST
(User Info)

Yes you could do that, I chose to give him a bit more versatility in case of power supply variations -- also with the capability of suing 3 loads - one for each phase.

Ideally, I would have placed a switchable constant current source feeding the opto-couplers ( one, two or three ) one for each phase.

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Re: Altering my load control circuits (3.00 / 0) (#7)
by Nando (nando37-at-comcast-dot-net) on Sun Jan 22nd, 2006 at 07:42:27 AM MST
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thanks for the link to datasheetcatalog.com I was not aware of the place.

Nando

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Re: Altering my load control circuits (3.00 / 0) (#8)
by willib (willibur at comcast dot net) on Sun Jan 22nd, 2006 at 07:58:28 AM MST
(User Info) http://www.njwind.com/webcam.html#

i would have preferred to go directly to motorola's site , but that was the first good link that poped up on google..

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Re: Altering my load control circuits (3.00 / 0) (#9)
by coldspot on Mon Jan 23rd, 2006 at 02:12:02 PM MST
(User Info)

Hey Nando-
have you tried this one?
"http://www.alldatasheet.com/view.jsp
just my $0.02

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Altering my load control circuits | 9 comments (9 topical, 0 editorial) | Post A Comment

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