Solenoid Tube Burn Through
Solenoid Tube Burn Through
(OP)
Ocassionally, I have a coil which shorts to the solenoid tube and burns a hole through it. Does anyone have any suggestions how to stop this?
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 Tube Burn Through
|
RE: Solenoid Tube Burn Through
Patricia Lougheed
Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
RE: Solenoid Tube Burn Through
RE: Solenoid Tube Burn Through
As vpl says, pictures might help a lot.
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Solenoid Tube Burn Through
120/60 Class F NEMA 4
Rated temp. 311F
Calculated operating temp. 207F
Actual temp. 176F
In rush 1.24 amp
Holding .48 amp / 33.5 watts
Outdoor service / refrigeration appllication
Freeze thaw conditions
Vibration - no
Sorry I don't have pictures at this time.
RE: Solenoid Tube Burn Through
Freeze-taw condition will give condensation in coil housing if not protected, air will always get in and condensate will form. Ex-coil with the whole coil protected in plastic casting might be a suggestion, and/or coil in heated cabinet or traced.
Also see too that nippels/boxes for cabels into coil housing either are of high quality (again ex nippels might do to ensure leakage tight) or again cast in cable with cable connection terminal in protected/warm area.
Always drip-nose on cable before entering solenoid.
Check that operating current and electrical protection is as should be under real operating conditions at site. Measure and observe!
RE: Solenoid Tube Burn Through
Any possibility of the valve itself sticking? If the solenoid armature doesn't pull in fully then the coil will draw considerably more than the hold-in current. In this respect DC coils are superior because coil current is resistance limited and is independent of armature position, whereas AC coil current is reactance limited and is dependent on armature position.
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Solenoid Tube Burn Through
Solution could easily be: Put a slim perforated or wavy spacer between bottom of coil and swaged collar on tube, like a wavy washer or Washburne ring...I have also seen a wick material (cotton shoelace, in fact) wrapped around the tube to help the water bleed out while energized....Do not space the coil upward any more that a mm or so, or it will start overheating.