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Bypassing a momentary switch

Discussion in 'General Electronics Discussion' started by tasehr, Jun 28, 2016.

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  1. tasehr

    tasehr

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    Jun 28, 2016
    I am wondering if anyone knows a good way to bypass a momentary switch. Basically, I have an air conditioner unit with a momentary switch that I would like to turn on whenever power is applied. If I hold the momentary switch in when applying power I get an E1 error since the switch is not released. I would think that there would be someplace that could be jumpered on the board to make this auto on. I am including pictures of the front and back of the board. Any help would be greatly appreciated.
     

    Attached Files:

  2. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    Hello tasehr and welcome to ElectronicsPoint. We're going to need more info from you. To start with is this switch connected to the high or low rail?

    Chris
     
  3. tasehr

    tasehr

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    Jun 28, 2016
    Chris, I have no idea, is there a way to tell by looking at it or how it operates?
     
  4. Bluejets

    Bluejets

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    What does this existing momentry switch do?
    Have you lost the remote and this is the manual start?
     
  5. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    Which switch are we talking about? There are 6 of them.
    Do you have any basic test equipment like a DMM?

    Chris
     
  6. tasehr

    tasehr

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    Jun 28, 2016
    It is the bottom switch. It is to manually turn it on by press and release.
    I do have a DMM.
     
  7. Bluejets

    Bluejets

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    A couple of 555 timers should do it.
    One to give time for the power to establish and settle.
    Other set up as a monostable to close a small relay momentarily then open again.
    There are probably a hundred ways to do the above but this is just one.
    But you would need to have some experience as the low voltage for these would need to be sourced from somewhere (maybe the existing board).
    Not only are you mixing low and mains voltage cabling but you need to know how to keep the two legally isolated.
    i'm just wondering why you need to do it?
     
  8. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Sir tasehr . . . . .


    " I'm just wondering why you need to do it?" . . . .

    Me too . . . . .and isn't this being a Haier unit . . . and what is its model number ?

    Is it a situation of there being a power loss and with several units . you have to travel to each unit to
    start up each unit again ? . . . . . .school classrooms . . . . . .motel . . . . .



    73's de Edd
     
    Last edited by a moderator: Jul 2, 2016
  9. tasehr

    tasehr

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    Jun 28, 2016
    It is an AC unit in a small building outside the house and I would like to be able to turn it on through a z-wave appliance module prior to going outside to pre-cool the building.

    It is a Haier, Model ESA406 I think.
     
  10. tasehr

    tasehr

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    Jun 28, 2016
    Actually, the model number is ESA410K.
     
  11. 73's de Edd

    73's de Edd

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    Sir tasehr. . . . . . .

    Soooooo I wasn't familiar with that switched power item, so I had to really-search it.

    Like:

    The Leviton DZPA1 is a Z-Wave enabled universal switch designed for use for most residential lighting and motor applications.
    A large range of load types are supported including LED and CFL, incandescent, halogen and magnetic Low-Voltage, electronic Low-Voltage,
    fluorescent, and motor loads up to 1/2-HP.
    The DZPA1 is fully compatible with the Wink Hub as well as all of other certified Z-Wave controllers.

    [​IMG]


    Full write up:

    http://www.homedepot.com/p/Leviton-...ith-LED-Locator-White-R02-DZPA1-1LW/205299188

    This unit is only handling one horsie powder .

    Is your unit being a heavier unit . . . . considering that your 120VAC AC . . . .up to a ton AC ? . . is going to be continually plugged into this device
    for accomplishing remoted power switching.

    Seems logical for the mod to be made associated with THIS unit and then route a LV 2 conductor line to the AC unit to activate a reed relay inside the unit with
    a totally isolated reed switch, doing your momentary contact across that bottom switch.

    It's a looka like . . .that . . . . its a looka like dis:
    [​IMG]


    73's de Edd
     
    Last edited by a moderator: Jul 2, 2016
  12. tasehr

    tasehr

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    Jun 28, 2016
    That is the module and the AC unit. I currently have the AC plugged into the module and it powers it fine. I just have to be there to push the button on the unit or remote.
     
  13. Bluejets

    Bluejets

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    Maybe a $30 rc tx/rx with a servo glued to the case to operate the button. (cheap alternative)
    Other is a dedicated transmitter /receiver module with solid state switching which would need mods to the board and enough knowledge to do so. Downside is any warranty would go out the window.
     
  14. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Sir tasehr . . . . . .

    If I hold the momentary switch in when applying power I get an E1 error since the switch is not released.

    For further clarification, you get that E1 error and therefore, the AC wouldn't power up and come on ?
    But just as soon as you release it and press again the unit will come on , . . .right ?

    I can see that you are more than an armchair observer and pipe dreamer since, at the least, you have GOTTEN access to the board and photographed both sides for us.
    Now we know nothing of your soldering expertise, any components on hand, and their familiarity, and your capability to make a small perfboard circuit with possibly 10-12 parts on it.

    As I observe the board I see that no HEAVY power components are being present, with them being remoted away elsewhere.

    I see the two digit display at top, an IR receiver just below it and finally, down at the unit's controller IC, I see access to a filtered 5 VDC supply.
    So that would be adequate to wire in and drive a 5V reed relay to simulate a momentary pressing of the frontal SW1..
    If you are not up to the prior mentioned situations I would make a slight variant to another suggestion, with the use of a purchased remote controlled doorbell circuit to drive the reed relay.
    (If that building is not 300 feet away )

    http://www.walmart.com/ip/US-Plug-i...wl11=online&wl12=51744099&wl13=&veh=sem#about


    Add:
    Is that an indicator LED on the top of the Leviton DZPA1 or a manual activation switch ?

    [​IMG]

    73's de Edd
     
    Last edited by a moderator: Jul 2, 2016
  15. tasehr

    tasehr

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    Jun 28, 2016
    The button on the Leviton is an indicator LED and is used during setup to link the device to your hub.
    I will try the reed relay that you mentioned and see if that works. Thanks,
     
  16. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    .


    Sir tasehr . . . . . . .

    That designated relay will certainly provide the required isolation that will be needed.

    BUT I asked about your capability-materiel and expertise, for the additional little amount of electronics circuitry construction related to providing the DELAY aspect in the triggering of that reed relay for one blip..

    HOWEVER, as competetive as the electronics market is now getting, even I, couldn't be building that required circuitry, for anything like this pre built offering:

    http://www.ebay.com/itm/Brand-New-5...er-/172167371041?_trksid=p2141725.m3641.l6368

    The only downside is probably a 2-3 week wait for a scheduled delivery from Hong Kong.


    73's de Edd


    .
     
    Last edited: Jul 2, 2016
  17. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
    Yes Ed, it's damn near impossible to beat a bargain like that. Heck, an electronics head could have 99% of the parts needed to build it from scratch and still fall short paying for the 1% he didn't have! I've waited as much as a month for Chinese deliveries but the price and quality is worth the wait.

    Chris
     
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