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Hallo again to all PicList members,

I have difficulties switching a forward and reverse 220V AC bi directional
motor with a pic, triacand optocoupler combination!

The motor is a typical electric sliding gate opener motor - three wires -
neutral, live(forward) and live(reverse) with a starting cap between forward
and reverse.

The obvious way is to use two relays. The one relay control the direction
and the other one switch the current...

I want to do it without relays!!!!

I have connect  two MOC3011 optocouplers  and  two IT416  triac's to a pic
to
control this motor, but this configuration damage the two IT's......
I can connect either forward or reverse, but not both!!

(It seems like the back EMF from the oposite direction switch the motor on
in the opposite direction as well and the motor just vibrates - not sure)

Attached is a unscrambled version of the layout...


Can someone help?

Kindest regards

Francois Robbertze
fr10@mweb.co.za



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                     =20
MotorReverse---+-----/\/\/--------+
220V AC        |     100R         |          =20
  +            |                  |            =20
  |            |                  |   =20
  |            |                  |           ______
  |            |    /-------------|--------4-|      |-3=20
  |            |   /              |          |      |          / /
  |           ------              |          | MOC  |        |\=20
  |     Triac \  /\               |        5-| 3011 |-2------| =
|------->GND
  |     IT416  \/  \              |          |OptoC |        |/       =20
  |           ------              |          |      |
  |             |                 =
+--------6-|______|-1------/\/\/-----To PIC(RB0)
  |             |                                            100R
 ---            |
 CAP            +--------+               =20
 ---                     |           =20
  |                      |              =20
  +                      |    =20
MotorForward----+--------|---/\/\/------+
220V AC         |        |   100R       |          =20
                |        |              |            =20
                |        |              |   =20
                |        |              |       ______ =20
                |    /---|--------------|----4-|      |-3=20
                |   /    |              |      |      |         / /
              ------     |              |      | MOC  |        |\=20
        Triac \  /\      |              |    5-| 3011 |-2------| =
|------->GND
        IT416  \/  \     |              |      |OptoC |        |/        =

              ------     |              |      |      |=20
                |        |              =
+----6-|______|-1------/\/\/-----To PIC(RB1)
                |        |                                     100R
                |        |
                +--------+                                             =20
                |
Neutral---------+  =20
220V AC


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