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April 2005

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Subject:
From:
Jerry Dengler <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jerry Dengler <[log in to unmask]>
Date:
Thu, 28 Apr 2005 11:40:09 -0400
Content-Type:
text/plain
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text/plain (120 lines)
Taking David's mismarking one step further, it might be all correct except for the working voltage.

Jerry

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roach, David
Sent: Thursday, April 28, 2005 11:29 AM
To: [log in to unmask]
Subject: Re: [TN] Capacitor Failures

...or the capacitor could be mismarked  (naw, that never happens).


Dave Roach
Trane GCC
4833 White Bear Parkway
St. Paul, Minnesota  55110
651-407-4294

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Crepeau, Phil (Space
Technology)
Sent: Thursday, April 28, 2005 10:27 AM
To: [log in to unmask]
Subject: Re: [TN] Capacitor Failures

groan.

of course the capacitor could be installed 'correctly', but the design could be backward.

phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Whittaker, Dewey
(AZ75)
Sent: Thursday, April 28, 2005 7:53 AM
To: [log in to unmask]
Subject: Re: [TN] Capacitor Failures


Phil,
Your statement could potentially have a polarizing effect.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Crepeau, Phil (Space
Technology)
Sent: Thursday, April 28, 2005 7:39 AM
To: [log in to unmask]
Subject: Re: [TN] Capacitor Failures

i hate to suggest something that may be too obvious, but...are these parts installed backwards?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Gary Bremer
Sent: Thursday, April 28, 2005 7:27 AM
To: [log in to unmask]
Subject: [TN] Capacitor Failures


Has any one had any problems with Vishay Capacitor P/N 595D226X9050R2T failing?
From our electrical engineers statement the most common failure is during in-circuit test.  This is conducted at ambient temperature & humidity.
These capacitors are used to decouple an input voltage, which is set to increasing values.  The failures have been occurring when a steady-state input voltage of around 38 VDC is used.  When the voltage is left on, the chances of failure increases.  For example, two different capacitors were blown when the input voltage was left on for about 2 minutes.

--
Gary Bremer
Senior Manufacturing Engineer

Curtiss-Wright Controls Inc.
Embedded Computing -Subsystem

28965 Avenue Penn
Santa Clarita, CA 91355-4185
Main: 661.257.4430 extension 2170
Fax: 661.257.4782
e-mail: [log in to unmask]
Web: www.cwcembedded.com

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