Blush you appear correct. Availability error I guess. The most available
situation to my mind was my own recent DC situation. Actually, it makes this a
even more intersting question. I apologize if I confused anyone
Gary
-----Original Message-----
From: Yow, Steve (IndSys, GEFanuc, NA) [mailto:steve....@gefanuc.com]
Sent: Tuesday, December 18, 2001 8:19 AM
To: emc-p...@majordomo.ieee.org
Subject: RE: surges on 24VAC
It seems all the answers are for DC power. I thought the question was for
24V AC. At least that is how it read in the subject......
Any changes to the comments.
-----Original Message-----
From: Michael Taylor [mailto:mtay...@hach.com]
Sent: Tuesday, December 18, 2001 9:34 AM
To: 'KC CHAN [PDD]'; jb...@bb-elec.com; emc-p...@majordomo.ieee.org
Subject: RE: surges on 24VAC
As a matter of policy my company tests DC ports to the appropriate levels on
all products where we do not supply the external DC Power Supply. As we
cannot guarantee the quality of the DC power supply the customer will use or
the installation, we assume the worst. In this instance you would be
relying on a DC supply you know nothing about to protect your product from
transients. It's simply a matter of "Do you want to be known as a supplier
of products that work ALL THE TIME - or SOME of the time.
Occasionally you have to remind the marketing department of the cost of poor
quality. While it may cost a dollar or two to add appropriate protection,
the cost of no protection is much higher in the long run. Warranty costs
can eat a company alive not to mention the reputation one could acquire for
quality problems. In my opinion, it's not worth the risk to not test & fix,
where appropriate.
Just one guy's opinion.
Regards,
Michael Taylor
Colorado
-----Original Message-----
From: KC CHAN [PDD] [ mailto:kcc...@hkpc.org <mailto:kcc...@hkpc.org> ]
Sent: Monday, December 17, 2001 6:49 PM
To: jb...@bb-elec.com; emc-p...@majordomo.ieee.org
Subject: Re: surges on 24VAC
I am thinking if it is possible to connect the source input to the surge
tester to a DC source, instead of the AC source, then you can apply the
surge tests to the DC input of your product.
>>> "Jennifer Banh" <jb...@bb-elec.com> 12/18/01 03:43am >>>
Hello everyone,
I am currently trying to test a product of ours that falls under
50082-1
generic standard for light industrial equipment. Our problem is that we
have a 24VAC power input port. The generic standard calls out for EN
61000-4-5 on AC power input ports. After looking at EN 61000-4-5 it seems
that it is intended for AC mains voltages, but I couldn't find anything that
says a 24VAC input is exempt from this test. I am looking for outside
opinions on whether this test is truly applicable.
Thanks,
Jennifer Banh
BTW, we already tried just testing to the spec, and failed. Any suggestions
on how to protect against this test would also be appreciated.
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