Solenoid rated 24v 60hz supplied with 24vdc
Solenoid rated 24v 60hz supplied with 24vdc
(OP)
If a Solenoid valve rated 24v, 60hz is connected to a 24vdc supply is it possible that this could work?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Solenoid rated 24v 60hz supplied with 24vdc
|
RE: Solenoid rated 24v 60hz supplied with 24vdc
AC solenoids control the current thru themselves by their inductance, of course DC doesn't care about inductance and would run unchecked thru the windings.
DC solenoids are wound to have their wire resistance limit the current.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Solenoid rated 24v 60hz supplied with 24vdc
But it may be possible to use them also on DC. Keith has tried that technique once without remembering it. Use a large capacitor and charge it via a resistor. Pull in the solenoid by connecting the charged capacitor across the solenoid. You will need to experiment with capacitor value, start at 1000 microfarad and don't be surprised if you need a lot more than that.
When the solenoid pulls in, you need to adjust the resistor so you get a safe seal-in current. It will probably be in the order of 10 - 20 percent of the pull in current. Contactors with a drop-out delay are built like that. Usually with an NC contact that bridges the resistor during pull-in.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Solenoid rated 24v 60hz supplied with 24vdc
fivecents; Depending on your situation there is also a standard turn-down method where you can use a higher voltage AC relay successfully with low voltage DC. In this case the many winds used in the higher voltage AC unit provide enough DC resistance to allow the lower voltage to work acceptably. It's something like a 120VAC unit can be run with 24VDC, or is it 240VAC->24VDC and 120VAC->12VDC.?.
Here's a link that discusses it in detail:
http://ecmweb.com/content/using-ac-coils-dc-power
Keith Cress
kcress - http://www.flaminsystems.com
RE: Solenoid rated 24v 60hz supplied with 24vdc
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Solenoid rated 24v 60hz supplied with 24vdc
But, of course, you are right. I just didn't think that it was possible. If it is, then so much better.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Solenoid rated 24v 60hz supplied with 24vdc
How do you tell what sort of coil you've working with?
1. Read the bumf.
2. Connect to DC and measure MTTFPS (mean time to first puff...)
3. Try measuring coil resistance using a 1.2 V cell and an ammeter. If the cell fails to push any reasonable current through the coil, that suggests either that you've already failed test (2) above, or that the cell is facing a couple of diode forward voltage drops.
A.
RE: Solenoid rated 24v 60hz supplied with 24vdc
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Solenoid rated 24v 60hz supplied with 24vdc
Upon further investigation 2 other solenoids on machine junk.. New solenoids with 24vdc rated coils coming soon.
RE: Solenoid rated 24v 60hz supplied with 24vdc
If you try it in reverse and apply full DC to an AC rated coil then the winding resistance can be far too low to oppose pure direct current and you'll end up smoking the coil.
RE: Solenoid rated 24v 60hz supplied with 24vdc
125 and 250 volt DC relays have springs like bear traps and many have parallel coils. The "holding" part of the coil has more turns and higher resistance.
RE: Solenoid rated 24v 60hz supplied with 24vdc
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.