ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/21/17 09:27 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,232 Are you busy
174,634 Re: Forum
167,060 Need opinion
Who's Online Now
0 registered members (), 79 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#26172 - 05/31/03 11:42 AM solenoid question  
Nevin  Offline
Member
Joined: May 2001
Posts: 30
Lititz PA 17543
I have an electrically operated hydraulic valve. It has 2 solenoid on each end and is self centering when all elecricity is removed.

During normal operation the solenoid on one side is energized, moving the hydraulic spool over. When electicity is removed and applied to the other solenoid, the spool moves in the other direction.

My question is, If electricity were applied to both solenoids simultainiously (due to malfunctioning or incorrectly setup equipment), would it cause coil burn out? If it does, why does it? Does it overheat due to the iron core not being pulled into the center of the coil?
We had this senorio happen where due to setup error both coils were energized at he same time and after a short period of time one of the coils failed. However before the coil failed, the valve "seemed" to operate as normal except it would never stay in neutral. Apparently the one coil was stronger then the other and over rode the weaker one.

Does anyone have any insight on this?


Work Gear for Electricians and the Trades

#26173 - 05/31/03 01:21 PM Re: solenoid question  
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
If the core is already at one end of the travel, (one coil energized) and the other coil is then energized, the second coil will not have enough force to pull the core to center. The force from a solenoid is a function of core position, with maximum force available at the end of travel.

So the core will remain at one end of travel, and the other coil will overheat due to excessive current (caused by the core not moving to complete the magnetic circuit).


#26174 - 05/31/03 02:02 PM Re: solenoid question  
Vickrey  Offline
Member
Joined: May 2003
Posts: 10
Fort Stockton, Texas,USA
An enregized solenoid coil will burn up with out at least a partial presents of the core. I believe you were correct about what happened. When one coil finally gave up the smoke the other got the core The surviving coil is probablly degraded and could have a shortend life expectancy. If this is a safety item I would replace them both.
I've seen coils removed from the assembly to change the core/shuttle (which is a high fail mechanical part) and during this time the plant energized the coil. Naturally when everything was put back together it didn't work because the coil was fried.


#26175 - 06/02/03 11:51 AM Re: solenoid question  
Nevin  Offline
Member
Joined: May 2001
Posts: 30
Lititz PA 17543
Thanks for the replies.
That confirms my suspicions!



Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.012s Queries: 14 (0.003s) Memory: 0.7599 MB (Peak: 0.8904 MB) Zlib enabled. Server Time: 2017-07-23 12:52:49 UTC