Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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  #11   Report Post  
Old January 1st 09, 06:16 AM posted to sci.electronics.repair
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Posts: 1,569
Default Electric fence "Electric Shepherd" ESB 250

On Wed, 31 Dec 2008 08:26:59 -0000, "N_Cook" put
finger to keyboard and composed:

Back working with proper bridged repair, new neons etc . I'm asuming 8KV (it
is actually mentioned on the label) , at least it fires a neon via 100M ,
(0.1G ) dropper, I will dig out EHT divider today. The casing screws mayvbe
UNC which may indicate USA but label has UK address. Electric Shepherd
printed on the PCBs


FWIW the following device has an open output voltage of 8kV.

Electric Shepherd ESB25 Battery Fence Energiser:
http://www.rutland-electric-fencing....chTe xt=esb25

I have an electric fence controller kit that works by charging a 7uF
"dump" capacitor to 340V and then discharging it into the primary of
the HV transformer. The energy stored by the cap is ...

E = 0.5 x C x V x V = 0.40J

Its output voltage peaks at 3.6kV.

The ESB25 is spec'ed at 0.08 Joules, so perhaps you can work out the
required capacitor voltage (= transformer primary voltage) as follows:

V = sqrt( 0.08 x 2 / C)

Assuming V = 110V, then C = 13uF.

What is the rated DC voltage of your dump capacitor, assuming yours is
a similar design?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

  #12   Report Post  
Old January 1st 09, 09:39 AM posted to sci.electronics.repair
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Posts: 5,029
Default Electric fence "Electric Shepherd" ESB 250

Franc Zabkar wrote in message
...
On Wed, 31 Dec 2008 08:26:59 -0000, "N_Cook" put
finger to keyboard and composed:

Back working with proper bridged repair, new neons etc . I'm asuming 8KV

(it
is actually mentioned on the label) , at least it fires a neon via 100M ,
(0.1G ) dropper, I will dig out EHT divider today. The casing screws

mayvbe
UNC which may indicate USA but label has UK address. Electric Shepherd
printed on the PCBs


FWIW the following device has an open output voltage of 8kV.

Electric Shepherd ESB25 Battery Fence Energiser:

http://www.rutland-electric-fencing....px?ProductID=2
88&[email protected]@3FProductSear [email protected]&ProductList
TypeName=SearchProductList,%20App_Code,%20Version= 0.0.0.0,%20Culture=neutral
,%20PublicKeyToken=null&IncludeDealersOnly=False&P roductSearchText=esb25

I have an electric fence controller kit that works by charging a 7uF
"dump" capacitor to 340V and then discharging it into the primary of
the HV transformer. The energy stored by the cap is ...

E = 0.5 x C x V x V = 0.40J

Its output voltage peaks at 3.6kV.

The ESB25 is spec'ed at 0.08 Joules, so perhaps you can work out the
required capacitor voltage (= transformer primary voltage) as follows:

V = sqrt( 0.08 x 2 / C)

Assuming V = 110V, then C = 13uF.

What is the rated DC voltage of your dump capacitor, assuming yours is
a similar design?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


All boxed up now but from my listing of major devices it is 20uF, 400V
Of course the 110V primary is now used as the secondary here, for th
evoltage step-up. Internal construction looked the same as mains
transformer.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/


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Old January 1st 09, 08:17 PM posted to sci.electronics.repair
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First recorded activity by DIYBanter: Jul 2006
Posts: 1,569
Default Electric fence "Electric Shepherd" ESB 250

On Thu, 1 Jan 2009 08:39:30 -0000, "N_Cook" put
finger to keyboard and composed:

Franc Zabkar wrote in message
.. .
On Wed, 31 Dec 2008 08:26:59 -0000, "N_Cook" put
finger to keyboard and composed:

Back working with proper bridged repair, new neons etc . I'm asuming 8KV

(it
is actually mentioned on the label) , at least it fires a neon via 100M ,
(0.1G ) dropper, I will dig out EHT divider today. The casing screws

mayvbe
UNC which may indicate USA but label has UK address. Electric Shepherd
printed on the PCBs


FWIW the following device has an open output voltage of 8kV.

Electric Shepherd ESB25 Battery Fence Energiser:

http://www.rutland-electric-fencing....px?ProductID=2
88&[email protected]@3FProductSea [email protected]&ProductList
TypeName=SearchProductList,%20App_Code,%20Version =0.0.0.0,%20Culture=neutral
,%20PublicKeyToken=null&IncludeDealersOnly=False& ProductSearchText=esb25

I have an electric fence controller kit that works by charging a 7uF
"dump" capacitor to 340V and then discharging it into the primary of
the HV transformer. The energy stored by the cap is ...

E = 0.5 x C x V x V = 0.40J

Its output voltage peaks at 3.6kV.

The ESB25 is spec'ed at 0.08 Joules, so perhaps you can work out the
required capacitor voltage (= transformer primary voltage) as follows:

V = sqrt( 0.08 x 2 / C)

Assuming V = 110V, then C = 13uF.

What is the rated DC voltage of your dump capacitor, assuming yours is
a similar design?


All boxed up now but from my listing of major devices it is 20uF, 400V
Of course the 110V primary is now used as the secondary here, for th
evoltage step-up. Internal construction looked the same as mains
transformer.


Assuming that the energy output of the ESB250 is the same as the
ESB25, then I calculate that the charging voltage should be 90VDC.
This seems low for a 400V cap. Maybe you should enquire as to the
actual energy rating.

FWIW, the ESB15 energiser is rated at 0.05J:
http://www.rutland-electric-fencing....ro ductID=289
http://preview.tinyurl.com/9xkv7d

Rutland's recommendations seem inconsistent:
http://www.rutland-electric-fencing....malCattle.aspx

"As a very general guide, the energiser powering a permanent fence
should have a stored energy of not less than 0.5 joules for cattle
...."

"Dairy cattle being strip grazed can usually be contained with a
single conductor of poly wire or 12mm poly tape, powered by an
energiser of around 0.25 Joules or less provided the voltage on the
fence is around 2,000 - 3000volts."

BTW, if you ever need to source a replacement transformer, then maybe
you could consider an old Philips FBT of the type that required a
tripler. Those would have had an output of 8kV (25kV / 3), and the B+
would have been 155V or less.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
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Old January 27th 09, 12:56 AM posted to sci.electronics.repair
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Posts: 1
Default Electric fence "Electric Shepherd" ESB 250

On Jan 1, 7:17*pm, Franc Zabkar wrote:
On Thu, 1 Jan 2009 08:39:30 -0000, "N_Cook" put
finger to keyboard and composed:





Franc Zabkar wrote in message
.. .
On Wed, 31 Dec 2008 08:26:59 -0000, "N_Cook" put
finger to keyboard and composed:


Back working with proper bridged repair, new neons etc . I'm asuming 8KV

(it
is actually mentioned on the label) , at least it fires a neon via 100M ,
(0.1G ) dropper, I will dig out EHT divider today. The casing screws

mayvbe
UNC which may indicate USA but label has UK address. Electric Shepherd
printed on the PCBs


FWIW the following device has an open output voltage of 8kV.


Electric Shepherd ESB25 Battery Fence Energiser:


http://www.rutland-electric-fencing....tail.aspx?Prod...
88&[email protected]@3FProductSea [email protected]&ProductLi*st
TypeName=SearchProductList,%20App_Code,%20Version =0.0.0.0,%20Culture=neutr*al
,%20PublicKeyToken=null&IncludeDealersOnly=False& ProductSearchText=esb25


I have an electric fence controller kit that works by charging a 7uF
"dump" capacitor to 340V and then discharging it into the primary of
the HV transformer. The energy stored by the cap is ...


*E *= 0.5 x C x V x V = 0.40J


Its output voltage peaks at 3.6kV.


The ESB25 is spec'ed at 0.08 Joules, so perhaps you can work out the
required capacitor voltage (= transformer primary voltage) as follows:


*V = sqrt( 0.08 x 2 / C)


Assuming V = 110V, then C = 13uF.


What is the rated DC voltage of your dump capacitor, assuming yours is
a similar design?

All boxed up now but from my listing of major devices it is 20uF, 400V
Of course the 110V primary is now used as the secondary here, for th
evoltage step-up. Internal construction looked the same as mains
transformer.


Assuming that the energy output of the ESB250 is the same as the
ESB25, then I calculate that the charging voltage should be 90VDC.
This seems low for a 400V cap. Maybe you should enquire as to the
actual energy rating.

FWIW, the ESB15 energiser is rated at 0.05J:http://www.rutland-electric-fencing....url.com/9xkv7d

Rutland's recommendations seem inconsistent:http://www.rutland-electric-fencing....malCattle.aspx

"As a very general guide, the energiser powering a permanent fence
should have a stored energy of not less than 0.5 joules for cattle
..."

"Dairy cattle being strip grazed can usually be contained with a
single conductor of poly wire or 12mm poly tape, powered by an
energiser of around 0.25 Joules or less provided the voltage on the
fence is around 2,000 - 3000volts."

BTW, if you ever need to source a replacement transformer, then maybe
you could consider an old Philips FBT of the type that required a
tripler. Those would have had an output of 8kV (25kV / 3), and the B+
would have been 155V or less.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.- Hide quoted text -

- Show quoted text -


I have a problem with the ESB 55 version. I believe that the thyristor
has blown. It seems to be an 82516 from ST Philips but has been
discontinued. Does anybody know of an alternative??? The two neons
have also blackened but I do not know what to replace them with. Could
you let me know what you used please. Many thanks. Jeff.
  #15   Report Post  
Old January 27th 09, 06:02 PM posted to sci.electronics.repair
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First recorded activity by DIYBanter: Apr 2008
Posts: 5,029
Default Electric fence "Electric Shepherd" ESB 250


I have a problem with the ESB 55 version. I believe that the thyristor
has blown. It seems to be an 82516 from ST Philips but has been
discontinued. Does anybody know of an alternative??? The two neons
have also blackened but I do not know what to replace them with. Could
you let me know what you used please. Many thanks. Jeff.

++++++

I just replaced the pair with a couple of standard mains indicator ones ,
without any dropper, just the original dropper which probably should have a
higher ohmic value. But as used outdoor, to see them flash then necessary,
then probably a matter of replacing the neons when necessary

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/




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