[gerryr1gerryr1]

Hi Zodiac thanks for you response.

I am in error on my “rough” drawing. D1 is drawn the reverse to how it has been fitted.After C1 the current is about 30V DC the Volt reg smooths this to 24V DC.
D2 blocks DC current from lighting LED 1 when power source is from the the manual 24 VDC source.D3 prevents LED 2 from lighting when power source is from open sprinkler.

Open Sprinkler is powered by a separate 240VAC/24VAC transformer.
Conversion to DC take place only on the output side on the Open Sprinkler.

I am not sure about my “common or neutral” connections.

Both the 24VAC source and the 24VDC power sources share the same “common”.
Maybe I should have a blocking diode on AC “Common”, close to the opensprinkler, to stop the negative half wave AC from using the DC “common”??

The circuitry seems to work just fine as far as output to the relays are concerned but I am concerned that by using the same “common” for AC and DC power sources
my be causing a problem somewhere.

As you can probably tell from my ramblings I am a real amateur but would appreciate any advice I can get.

have attached an Amended “Sketch” to adjust for incorrectly shown D1.

Thanks Gerry

Attachments:

1. 

   Revised.jpg
   

[gerryr1gerryr1]

Sorry Had to resize image

Attachments:

1. 

   imgp0576-2.jpg
   

[gerryr1gerryr1]

Thanks Michael. That was my answer. Everything OK now.

Thanks all appreciate the help

[gerryr1gerryr1]

Thanks Ray. Problem turned out to be a couple of bad solder joints on my own wiring shorting out the 2 stations .

Next Problem.

I cannot seem to program the unit to operate any more than one station at the same time.

I have a 16 output which I wish to use to program during a 24 hour period, which means that some stations will be operating at the same point in time.

For example:
sTation 1 start 9.30 am and run for 6 hours

station 4 start 10.20 am and run for 4 hours

station 12 start 1.00 pm and run for 50 minutes

station 8 start 1.30 pm and run for 10 minutes.

I can only get the unit to activate sequentially.That is Station 1 must complete its 6 hours before station 4 starts. This means that station 4 starts at 3.30
and the others cannot run until each station is finished.

How can I set the program up to do what I want it to do?

Thanks

Gerry

[gerryr1gerryr1]

Thanks for you input. Appreciated.

Query closed satisfactorily

[gerryr1gerryr1]

Sorry to be a pain but would this work?

I would prefer a 24 vdc output as all my existing relays and solenoids are 24 vdc.

As I see it all output from the opensprinkler would be converted to near perfect 24 vdc
by C1 and D1 and then D3 and D4 would stop the backwash of current from either power source
thus solving the LED issue I originally had.

Although unintended there exists a possibility that the same circuit could be powered from 2 power sources
at the same time, through accident, but is this a great issue with DC???

The system would be intended to drive only the solenoids or relays anything requiring more than 50 mA would be switched via relay.

I hope you guys could add your wisdom and point out the flaws cause I am a REAL amateur at this.

Thanks

Attachments:

1. 

   Open.jpg
   

[gerryr1gerryr1]

Have another question.

What is the minimum AC voltage required to operate open sprinkler.

Could the open sprinkle input voltage be say 14, 16, 18, or 20 vac?

[gerryr1gerryr1]

Thank you Sakos. Appreciate your comments and help

[gerryr1gerryr1]

Just priced up 18 24 vac coil relays and bases at about A$ 130 to A$150.

Would the attached sketch work ?? It would cost only a few diodes and caps.

The DC output would be fine cause most of my existing solenoids are DC.

Tested it on LC Spice and it seems OK but I really know nothing about this stuff so would appreciate a comment from someone more knowledgeable than myself.

Thanks

Attachments:

1. Snap_2015.12.02-16.17.01_002.pdf

[gerryr1gerryr1]

Thank you Sarkos. That should solve my problem. Appreciate your reply

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