Thanks for the info. I've got a few follow-up questions for you...
1. So the ECM can count the "voltage pulses"? It doesn't need a relay in the middle to change the voltage pulse to a dry circuit open/close?
2. From the perspective of the CQC driver for the ECM-1240 written by Rob...when the driver receives data, will it get the number of pulses and the number of seconds since the last time it received data? For example, if the ECM has a Send Packet Interval of five, and it has seen 20 pulses since the last send, will the CQC driver see 20 pulses and five seconds? If not, what data does it get from the engine?
3. As "smarty" noted, I would seldom overrun 14 pulses/sec, since that would be over six gpm, which would require several household users simultaneously using water at a fairly high flow rate (for household usage). However, I would still like to implement a a pulse divider if possible. I don't think I need to go 16-to-1 since I will never see 133 pulses/sec (60 gpm). 2-to-1 (or 4-to-1 if I really want to be safe) should be fine. Can you provide a diagram and parts list for a 2-to-1 pulse divider for those of us that are electronically challenged? Google wasn't much help.
4. Do you see any potential for damaging the water softener electronics or the ECM by doing this? Not asking for guarantees, but just wondering what you might foresee as far as negatives go.
5. You said... "As for the voltage compatability, you may be able to simply insert a resistor diode network." Can you explain further? If something is needed, can you provide a diagram?
I don't have any idea what the pulse duty cycle is, and I doubt the manufacturer would provide that information. Am I correct in thinking that the duration will decrease as water flow increases? I guess an oscilliscope would tell me...right?
Thanks for the help.
1. It is recommended to use dry contacts to isolate the ECM-1240 from other voltage sources or creating "ground loop" noise. I have been successful connecting directly such as the diode example in the attached pic.
2. Once setup, the existing watt-second register will display an incremental count representing the AUX-5 input pulses. Using this incremental count in conjunction with the seconds incremental count, the number of pulses and seconds between packets can be calculated, providing rate of flow (GPM) and gallons used. Rob should have no problem implementing this. He will need to treat the AUX5 watt-second counter accordingly.
3. I will add the divider circuit shortly.
4. Your water softener cannot be damaged if connected accordin to the diagram