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Yep. Feeling pretty dumb about now. Your help and patience is greatly appreciated! So your saying the steady state power for the resistor would only be about 12 watts? By "active solution" are you referring to a device like the DVR102, because I do like the way that works. It's fairly...

That configuration makes sense to me now. (see attached update) Not sure how I came up with 1/2 watt, other than two too many decibels. Power actually calculates out to 32 watts (strange how it's the same as the relay coil ;). Does the resistor need to be rated that high? That'll kill my...

Positioning the cap away from the resistor is duly noted. It looks to me like the easiest way to mount them (for my setup) would be on the opposite side of the pcb. Would you mind looking over the diagram attached to see if I have the arrangement of these components correct? The main question...

Thanx for the 400ma tip, OperaHouse. My intent was to find a happy medium with this, and not take it to and keep it on the edge. Having a figure in mind helps a lot. I like the idea of just a cap and resistor. So the current ends up cut in half with your setup? I don't think down time is...

Using a solenoid driver on this seems to do the trick. Have been able to drop the current from 1.145 amps down to 218 mAmps and still keep the solenoid engaged. The relay coil maintains it's original temp after quite an extended hold time. Here's a little vid demonstration...

Out of curiosity I hooked up the old system to this relay coil, and it acts the same way; gets hot after being energized for a minute or so. I suppose this is the way it's always been and I just did not notice it. Most of these valves are located in an area where I don't get near them very...

I'm only reading 24 volts across the coil. It does not get hot right away, it's been on for few minutes now and is just now getting fairly warm. Can hold my hand to it for 30 seconds before it gets uncomfortable. My guess is that it would continue to build heat?? but have not gone there...

Perhaps there is more wrong with my diagram!? Should the -24vdc just be labeled as ground? It's only a 24 vdc power supply. http://files.engineering.com/getfile.aspx?folder=a01d6a67-1287-4577-9c6d-2356e04bb85b&file=controlSchematic01Single.png

IRstuff, I'm quite certain that they are 24V relays. They are quite hefty but I'm really not that versed with this kind of equipment. They are closing 1" hydraulic (water) valves. thanx VE1BLL. have it correct in the circuit, but not the diagram! until now.

A small update on my progress. Attached is a new diagram with the following details: R1, R2 = 1.5k ohm LEDs are 3.6 V Flywheel Diode = 1N4004 Relay coil has a resistance of 18.4 Ohms, so a calculated current of 1.3 amps. Power supply likes this and seems to be holding up fine after repairing...

Lionel, that's basically what I was hoping to hear. The power supply came with the setup, which is large enough to run at least a 5 solenoid system. I only yesterday noticed the ps nameplate (removed the unit from the enclosure, and see that it's a 7.2 amp supply. I'm using no emf on the...

Scotty, and Mike: These came to me second hand, already wired to a different controller ( left side of my incomplete nonsense diagram). I believe that diagram would be complete if the leads from the two green connections actually touched. That doesn't mean that they had them wired properly...

I actually have the LEDs working fine on their own circuit on a breadboard. It's when a solenoid is wired in parallel that the trouble occurs. I'm sure my diagram is not kosher, but was hoping it to be at least legible. Apparently I failed there too. The blue and green icons with polarity...

I'd like to wire LED indicators to a series of solenoids. They are on a 24vdc circuit. The attached schematic shows what the original layout was on the left, and what I've tried already, on the right. Before I fry another power supply, I thought I'd ask some folks that may actually know how...

My apologies if this basic question has been addressed already. Searchs here and elewhere resulted in very little discussion on the subject. Being a novice, I'm interested in the use of 3 phase line and load reactors in conjuction with AC VFD's. It appears from looking at product lists that...

Bingo DickDV, I cannot thank you enough!! I'm seeing functions listed as "MOP" for both decrease and increase frequency in the AC Tech drive manual, pgs 36 and 37 (Adobe Reader pages), both functions set to "05" for TB 13b and c respectively (note to self!). That otta doer. I'll be looking...

Thanx jraef, That's very helpful. I've been tempted to pick up some used drives to "snoop" around them to see if they will work. One of the other ideas I've had but not acted on, was setting up a solid state potentiometer to drive the pot option. These devices are tiny, and working with them...

My application for AC drives requires a direct up and down frequency control. So far, there are two drive manufacturers that seem to have this feature; Saftronics (Fuji) and Yaskawa. I'd like to open my options to using other brands. For an example of the function being used, on a Saftronics...

Reading back through the post I see Quark's question about the top of the tank issue. This is exactly why I'm using the radio remote control. Most wineries have a wide variety of vessels. Many size tanks, sometimes in a wide array of positions/levels and then there's usually wine barrels. I...

The help here has been nothing short of tremendous! The pump I just purchased showed up today in fine condition. It was purchased second hand but looks brand new (no marks on the drive shaft). I wanted to have the pump in hand before starting to build a frame to hold the motor and pump...