Hello,
New member here, and I have a interference problem with two circuits:
I have a control circuit ( 5 VDC 3A ) operating a irrigation system ( 24 VAC 1.2A ), both have the same 120 VAC source.
The control circuit, after the 120 VAC source has a spike protection device APC brand, after it is a power supply ( computer pc type ) with a 5 VCD 22A output which is the source for all the control circuit. The control circuit is populated meanly with TTL's, PIC, eprom, RTC, and recommended capacitors.
The irrigation circuit is integrated with water fluid solenoides ( 24 VAC 250mA each ) just one on at each moment, and water pump ( 220 VAC 11A ) to inject pressure to the pipeline.
The control circuit decide when start/stop the pressure pump ( by 5VDC 250 mA realy ) and start/stop each solenoide for watering ( by 5VDC 200 mA realy ). All relays have its protection diode, and are powered by a TTL latch with a transistor between them.
The 24 VAC source is just a transfomer 120 VAC / 24 VAC without any other devices between the transformer and the solenoide.
PROBLEM:
Some times that the control circuit power any relay to open the solenoide valves ( 24 VAC ), the control circuit experience a voltage fluctuation and some times a badly unexpected operation. The 5 VDC variation goes from 3.5 to 6.2 VDC, and the TTL's must be in the 4.75 - 5.25 VDC range.
QUESTION:
Exist some device that I must install between the 24VAC transformer and the solenoide valves, in order to imitate the protection diode effect in a relay powered by VDC
New member here, and I have a interference problem with two circuits:
I have a control circuit ( 5 VDC 3A ) operating a irrigation system ( 24 VAC 1.2A ), both have the same 120 VAC source.
The control circuit, after the 120 VAC source has a spike protection device APC brand, after it is a power supply ( computer pc type ) with a 5 VCD 22A output which is the source for all the control circuit. The control circuit is populated meanly with TTL's, PIC, eprom, RTC, and recommended capacitors.
The irrigation circuit is integrated with water fluid solenoides ( 24 VAC 250mA each ) just one on at each moment, and water pump ( 220 VAC 11A ) to inject pressure to the pipeline.
The control circuit decide when start/stop the pressure pump ( by 5VDC 250 mA realy ) and start/stop each solenoide for watering ( by 5VDC 200 mA realy ). All relays have its protection diode, and are powered by a TTL latch with a transistor between them.
The 24 VAC source is just a transfomer 120 VAC / 24 VAC without any other devices between the transformer and the solenoide.
PROBLEM:
Some times that the control circuit power any relay to open the solenoide valves ( 24 VAC ), the control circuit experience a voltage fluctuation and some times a badly unexpected operation. The 5 VDC variation goes from 3.5 to 6.2 VDC, and the TTL's must be in the 4.75 - 5.25 VDC range.
QUESTION:
Exist some device that I must install between the 24VAC transformer and the solenoide valves, in order to imitate the protection diode effect in a relay powered by VDC
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