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External
Since: May 16, 2006
Posts: 530
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(Msg. 1) Posted: Wed Oct 24, 2007 1:42 pm
Post subject: iPower and UH400a
Archived from groups: rec>arts>movies>production>sound (more info?)
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To the Group:
Several customers have had problems with the iPower rechargeable
battery in a UH400. The symptoms are an immediate shutdown when the
battery is first inserted. To reset the battery, the battery has to be
removed and reinserted. Not all the batteries do it and not every
time. These same batteries work perfectly well in other products.
Richard at iPower got Paul Scurrell to send us 3 batteries (out of
eight) that were having this problem and we confirmed Paul's problem
here.
We then tried to duplicate the problem with other loads such as a lab
constant current load battery tester with adjustable current drains
and finally with load resistors paralleled with tantalum capacitors.
We couldn't make the battery fail until we were at currents 20 times
higher than the normal current drains. Since the UH400a switching
power supply is a step down unit, the initial current surge is fairly
moderate. We couldn't get the batteries to fail except in the UH400a.
The culprit turned out to be some ceramic, high value capacitors (20
uF) directly across the UH400a battery contacts. If the UH400a power
switch is in the "on" position and the battery is put into the battery
compartment, the surge of current into the low impedance capacitors
plus the startup power drain is enough to occasionally trip the iPower
battery protection circuit. Once the circuit is tripped, the UH400a
12uA leakage current is enough to keep the battery tripped even if the
UH400a is switched off. At this point it is necessary to remove the
battery for a second or so and then reinsert it. If the UH400a is
switch is "on" there is a chance it will happen again.
If the UH400a power switch is in the "off" position when the battery
is inserted, the battery rarely will trip. The capacitor charging
current by itself is generally not enough to trip the iPower shutdown.
We did have it happen one time in many trials but then couldn't get it
to do it again.
Conclusion: If you have a sensitive iPower battery, use it in
something else or make sure the UH400a is off before inserting the
battery. Once the battery is past the initial turn on, it should be a
normal unit from there on.
Best Regards,
Larry Fisher
Lectrosonics |
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External
Since: Jul 12, 2007
Posts: 10
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(Msg. 2) Posted: Wed Oct 24, 2007 8:00 pm
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Hi Larry,
Thanks for that info. I have also seen this behavior infrequently in
my UM400's as well. However, a quick "on and off" using the
transmitter switch will get it going again. Good to know that I'm not
the only one, and I'll stop hot swapping batteries...
cheers,
Brent C |
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External
Since: Jul 02, 2004
Posts: 47
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(Msg. 3) Posted: Sat Oct 27, 2007 6:08 am
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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this is good info...thanks..l have 2 dud i/9v batts ex uh400a..out of 12
ibatts running lectros and comteks... in my first week of using these
ibatts????
cheers dave h
"freeheel" wrote in message
> Hi Larry,
> Thanks for that info. I have also seen this behavior infrequently in
> my UM400's as well. However, a quick "on and off" using the
> transmitter switch will get it going again. Good to know that I'm not
> the only one, and I'll stop hot swapping batteries...
> cheers,
> Brent C
> >> Stay informed about: iPower and UH400a |
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External
Since: Aug 02, 2003
Posts: 438
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(Msg. 4) Posted: Sat Oct 27, 2007 9:55 am
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Hey Dave, how are you??
I am pretty well shaken out on my iPower 9v batteries. I have had three
duds in 18 total. I am now using them in all my UM400 transmitters
(primarily two wireless boom rigs) and changing them out every three or four
hours. Seems to be working. I now know that it is the instantanious
lo-voltage cutoff on the battery that seems to make them seem unpredictable.
Working fine Take 3, green lights on the transmitter, and then, gone on Take
4. This is a Larry F question but can the amber warning light on the UM400s
be trimmed upward specifically to account for the higher cutoff in the
iPowers than in Alkaline 9v?
D.
"Dave Hurley" wrote in message
> this is good info...thanks..l have 2 dud i/9v batts ex uh400a..out of 12
> ibatts running lectros and comteks... in my first week of using these
> ibatts????
> cheers dave h
>
> "freeheel" wrote in message
>
>> Hi Larry,
>> Thanks for that info. I have also seen this behavior infrequently in
>> my UM400's as well. However, a quick "on and off" using the
>> transmitter switch will get it going again. Good to know that I'm not
>> the only one, and I'll stop hot swapping batteries...
>> cheers,
>> Brent C
>>
>
> >> Stay informed about: iPower and UH400a |
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External
Since: Jun 08, 2007
Posts: 85
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(Msg. 5) Posted: Sat Oct 27, 2007 12:47 pm
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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as a reference, iPowers are lasting between 5h 10min and 5h 35min on
my UM400 TXs.
Yesterday I had one shuting off when powering the TX on. I'll try to
use it again and see if it "resets"...
Fernando >> Stay informed about: iPower and UH400a |
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External
Since: May 16, 2006
Posts: 530
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(Msg. 6) Posted: Tue Nov 06, 2007 1:01 pm
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Hi Doug,
I will put it down for a future update. It sounds like a good idea
that would handy as more iPowers get used.
LarryF
Lectro
On Sat, 27 Oct 2007 09:55:38 -0600, "Douglas Tourtelot"
wrote:
>Hey Dave, how are you??
>
>I am pretty well shaken out on my iPower 9v batteries. I have had three
>duds in 18 total. I am now using them in all my UM400 transmitters
>(primarily two wireless boom rigs) and changing them out every three or four
>hours. Seems to be working. I now know that it is the instantanious
>lo-voltage cutoff on the battery that seems to make them seem unpredictable.
>Working fine Take 3, green lights on the transmitter, and then, gone on Take
>4. This is a Larry F question but can the amber warning light on the UM400s
>be trimmed upward specifically to account for the higher cutoff in the
>iPowers than in Alkaline 9v?
>
>D. >> Stay informed about: iPower and UH400a |
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External
Since: Jun 08, 2007
Posts: 85
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(Msg. 7) Posted: Wed Nov 07, 2007 8:58 am
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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as reported in another thread, 5 out of my 8 iPower batteries died on
my UM400 and/or refused to be charged
I finally was able to charge them, I'll have to test them
I keep batteries and charger bays numbered >> Stay informed about: iPower and UH400a |
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External
Since: Jun 03, 2007
Posts: 11
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(Msg. 8) Posted: Wed Nov 07, 2007 10:35 am
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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I've had a similar scenario come up with my ipower batts. I put it
into my LM TX, and it won't turn on. The batts work great in all other
lectro gear, and the LM powers up fine when using a regular procell.
But the LM just doesn't seem to want to be powered by the Ipower.
Could this be a similar problem as described with the Um400's ? >> Stay informed about: iPower and UH400a |
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External
Since: Jun 04, 2007
Posts: 155
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(Msg. 9) Posted: Wed Nov 07, 2007 12:38 pm
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Nov 7, 1:35 pm, Simon wrote:
> I've had a similar scenario come up with my ipower batts. I put it
> into my LM TX, and it won't turn on. The batts work great in all other
> lectro gear, and the LM powers up fine when using a regular procell.
> But the LM just doesn't seem to want to be powered by the Ipower.
> Could this be a similar problem as described with the Um400's ?
I'm guessing it is -- interestingly enough, it hasn't happened to me
with UH400a's, but it HAS happened to me with the LM400 Tx. >> Stay informed about: iPower and UH400a |
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External
Since: May 16, 2006
Posts: 530
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(Msg. 10) Posted: Wed Nov 07, 2007 2:22 pm
Post subject: Re: iPower and UH400a [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Hi Noah and Simon,
Hadn't heard of this with the LM before; will check it out. We have
been sent new batteries by iPower that will handle larger statup
currents for testing.
Best Regards,
Larry Fisher
Lectrosonics
On Wed, 07 Nov 2007 12:38:57 -0800, Noah Timan
wrote:
>On Nov 7, 1:35 pm, Simon wrote:
>> I've had a similar scenario come up with my ipower batts. I put it
>> into my LM TX, and it won't turn on. The batts work great in all other
>> lectro gear, and the LM powers up fine when using a regular procell.
>> But the LM just doesn't seem to want to be powered by the Ipower.
>> Could this be a similar problem as described with the Um400's ?
>
>I'm guessing it is -- interestingly enough, it hasn't happened to me
>with UH400a's, but it HAS happened to me with the LM400 Tx. >> Stay informed about: iPower and UH400a |
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