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sorry, that was leg to leg...L1-L2, L1-L3 etc..

the overload is supposedly being damaged (automation direct ms25-1600). They are using a phase adder to a single phase supply then feeding the contactor/overload - motor circuit with that. It appears that they've measured various voltages on each leg (ex: 256,240,273)

Is it possible for an unbalanced 3 phase power supply to damage a properly rated starter/overload? What exactly is the problem that may be caused by an unbalanced power supply? I have a problem with the supply voltage not only being more than 10% out of the 230 +/- 10% rule but with varying...

In order to use a solenoid in a system that is powered by 480vac, we will be using a 480/240 transformer since we cannot find a 480v solenoid. Does this sound like it may be a problem to anyone? What things should I consider? Mark

right....I'm working on correcting it....any idea how far above the rating is catastrophic? i know that's a general question, but anyone got any generalizations from experience?

we have had several units running under these parameters for some time...I believe the last report was closer to 9 amps.

We are using a 250VA xxx/120 transformer in a system to supply the 120vac for various components. The various components, although not continuously, draw approximately 3a during normal use, maybe around 8a total for short periods (under 3 min). I'm figuring that the 250va transformer at 120 is...

uh oh...just looked at the charger again....60ah is the max battery size this thing will charge. So I'm looking at charging a 7ah 24V battery with a 24V 3A charger.....

the charger is rated 60ah at 3A/24V....I have never physically seen the batteries, but I believe they are radio shack bricks.

Using some calculators I'm finding online, I'm getting about 3 hours for a 7ah battery to charge @ 3A....I can't find a formula or rule of thumb to go by though... Also, the 2 12v batteries are connected in series, and to my knowledge, are identical....

incidentally, how can I calculate charge rate/time...the only facts I have are that the batteries are 7ah 12V (2 in series) and the charger is a 60ah 24V...

If I am using a battery charger to charge 2 12v batteries in series, it would see it as 1 24v battery, right? Would the fact that I am charging 2 12V's rather than 1 24V have any effect on the charging time?

???

ok....I've played with this all day for 2 days now...I got it working, but I have one unanswered mystery...when the down limit switch is depressed quickly, the motor will run as if building pressure, however, pushing the down ls again starts the piston moving.... Not sure I filled you in on the...

stupid question i'm sure, but how might I convert pdf to jpg or other?

Thanks Jraef....i wanted to keep the number of relays down, and a PLC is not really an option....yet :).... Actually I've got the relays wired up to latch, however, if the coil input is not solid, it still effects the contacts....I set up a test circuit and blew breakers and threw sparks and...

the control switches will be actuated by very large heavy metal plates...if they should hit the switch and bounce a little upon getting to their rest position, there could be a bouncing like action on the switch. I could always use a timer relay, but I was looking for a more simple way....does...

I use the word debounce loosely...I would like to prevent chatter from teh contacts. If DC, I could use a capacitor circuit...I'm not as familliar with ac circuits.. thanks....

I created a 220vac circuit where I'm using relay contacts to swtich on/off a valve and a motor contactor. Is there a way I can effectively 'debounce' the contacts using a small inductor or something? The coils of the relays are 'controlled' by other switches. I will gladly put the schematic...

I was given a couple drawings drawn in that format to use for a new design, expected to use an existing pcb. I've never had more trouble deciphering a drawing in my life. At least from a reverse engineering standpoint, it was a nightmare, however it may be more suited for a troubleshooting...