AC to DC Power Supply

  • Thread starter Stanley A. Gorodenski
  • Start date
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Stanley A. Gorodenski

Guest
I know very little about electronics. I need an ac-dc regulated 24 vdc 5
amp minimum (preferably, but 4 amp may do). I found a Lambda data sheet
at: http://www.lambdapower.com/ftp/Specs/jws.pdf
The model I am looking into is JWS100-24/A. They list a maximum current
of 4.5 amps. Does anyone know if this is supposed to be a surge current,
or the maximum
that can be drawn continuously? One supplier (Allied Electronics) states
"24 volts @ 3.6 amps" yet the Lambda data sheet says 4.5 amps max which
makes me think the 4.5 amps is a surge current.

I need a regulated power supply, but the data sheet on the Lambda power
supply does not indicate if it is regulated by using such terms as
"regulated" or "closed loop". Can one tell from the data sheet if it is
regulated? When I ask this question to the people (women) at Lambda,
all they do is send me the data sheet and say they hope this helps (on
two occasions).

One individual on another list recommended a 24 volt 6.5 amp switching
power supply at Alllied Electronics:
http://www.allelectronics.com/cgi-bin/category.cgi?category=480&item=PS-2465&type=store
A second individual said from experience to use a better power supply
from companies like SOLA, LAMBDA, VOGEN, and TRACO and made reference to
derating curves. The Lambda power supply mentioned above is a lot more
expensive than the Allied Electronics power supply: over $200 vs about
$35. Is the higher price for the Lambda really worth it? It will be used
to drive two servo motors on a telescope and I need good and consistent
telescope tracking accuracy. It seems like I am having a hard time
finding a 24 vdc power supply at the amp rating I need in the better
quality brands, but it seems cheaper ones, like the Allied Electronics
one, are easier to find. I do not know what to think.

Stan
 
"Stanley A. Gorodenski" <stan_gorodenski@asualumni.org> wrote in message
news:1094927833.544110@news.commspeed.net...
I know very little about electronics. I need an ac-dc regulated 24 vdc 5
amp minimum (preferably, but 4 amp may do). I found a Lambda data sheet
at: http://www.lambdapower.com/ftp/Specs/jws.pdf
The model I am looking into is JWS100-24/A. They list a maximum current
of 4.5 amps. Does anyone know if this is supposed to be a surge current,
or the maximum
that can be drawn continuously? One supplier (Allied Electronics) states
"24 volts @ 3.6 amps" yet the Lambda data sheet says 4.5 amps max which
makes me think the 4.5 amps is a surge current.

I need a regulated power supply, but the data sheet on the Lambda power
supply does not indicate if it is regulated by using such terms as
"regulated" or "closed loop". Can one tell from the data sheet if it is
regulated? When I ask this question to the people (women) at Lambda,
all they do is send me the data sheet and say they hope this helps (on
two occasions).

One individual on another list recommended a 24 volt 6.5 amp switching
power supply at Alllied Electronics:

http://www.allelectronics.com/cgi-bin/category.cgi?category=480&item=PS-2465&type=store
A second individual said from experience to use a better power supply
from companies like SOLA, LAMBDA, VOGEN, and TRACO and made reference to
derating curves. The Lambda power supply mentioned above is a lot more
expensive than the Allied Electronics power supply: over $200 vs about
$35. Is the higher price for the Lambda really worth it? It will be used
to drive two servo motors on a telescope and I need good and consistent
telescope tracking accuracy. It seems like I am having a hard time
finding a 24 vdc power supply at the amp rating I need in the better
quality brands, but it seems cheaper ones, like the Allied Electronics
one, are easier to find. I do not know what to think.

Stan
Click to expand...
Stan, take a look at the JWS100 series spec at
http://www.lambdapower.com/ftp/Specs/Jws100_Spc.PDF. It shows that this PS
will run at full load at temps from -10C to +50C in a standard mounting
configuration. It can go up to +60C with derating, (see spce sheet). See
the spec sheet for mounting configurations that are allowed.
The 4.5A current rating is a continuous rating. Overcurrent protection
kicks in at 4.72A. Yes, the PS is very definitely regulated, and can be
remotely sensed. That means that the power supply can regulate the voltage
right at the load, automatically compensating for voltage drop in the wiring
between the PS and the load. Of course, it can also be locally sensed (the
default configuration), which means that the voltage is regulated only to
the terminals on the PS, and does not compensate for wiring voltage drop.

The Globtek unit appears to be adequate for your needs, at much lower cost.
However, it doesn't have the operating temperature range that the Lambda
unit has.. only from 0C to 40C. If your environment can meet that temp
range, then go with the Globtek unit. If you need the extra comfort on the
high temp end, then spring for the cash and get the Lambda unit. See the
spec sheet at http://www.globtek.com/datasheets/pdf/rt_m_3s150.pdf. Again,
the current rating is continuous.

Hth,
--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!
 
"Stanley A. Gorodenski" <stan_gorodenski@asualumni.org> wrote in message
news:1094927833.544110@news.commspeed.net...
I know very little about electronics. I need an ac-dc regulated 24 vdc 5
amp minimum (preferably, but 4 amp may do). I found a Lambda data sheet
at: http://www.lambdapower.com/ftp/Specs/jws.pdf
The model I am looking into is JWS100-24/A. They list a maximum current
of 4.5 amps. Does anyone know if this is supposed to be a surge current,
or the maximum
that can be drawn continuously? One supplier (Allied Electronics) states
"24 volts @ 3.6 amps" yet the Lambda data sheet says 4.5 amps max which
makes me think the 4.5 amps is a surge current.

I need a regulated power supply, but the data sheet on the Lambda power
supply does not indicate if it is regulated by using such terms as
"regulated" or "closed loop". Can one tell from the data sheet if it is
regulated? When I ask this question to the people (women) at Lambda,
all they do is send me the data sheet and say they hope this helps (on
two occasions).

One individual on another list recommended a 24 volt 6.5 amp switching
power supply at Alllied Electronics:

http://www.allelectronics.com/cgi-bin/category.cgi?category=480&item=PS-2465&type=store
A second individual said from experience to use a better power supply
from companies like SOLA, LAMBDA, VOGEN, and TRACO and made reference to
derating curves. The Lambda power supply mentioned above is a lot more
expensive than the Allied Electronics power supply: over $200 vs about
$35. Is the higher price for the Lambda really worth it? It will be used
to drive two servo motors on a telescope and I need good and consistent
telescope tracking accuracy. It seems like I am having a hard time
finding a 24 vdc power supply at the amp rating I need in the better
quality brands, but it seems cheaper ones, like the Allied Electronics
one, are easier to find. I do not know what to think.

Stan
Click to expand...
Stan, take a look at the JWS100 series spec at
http://www.lambdapower.com/ftp/Specs/Jws100_Spc.PDF. It shows that this PS
will run at full load at temps from -10C to +50C in a standard mounting
configuration. It can go up to +60C with derating, (see spce sheet). See
the spec sheet for mounting configurations that are allowed.
The 4.5A current rating is a continuous rating. Overcurrent protection
kicks in at 4.72A. Yes, the PS is very definitely regulated, and can be
remotely sensed. That means that the power supply can regulate the voltage
right at the load, automatically compensating for voltage drop in the wiring
between the PS and the load. Of course, it can also be locally sensed (the
default configuration), which means that the voltage is regulated only to
the terminals on the PS, and does not compensate for wiring voltage drop.

The Globtek unit appears to be adequate for your needs, at much lower cost.
However, it doesn't have the operating temperature range that the Lambda
unit has.. only from 0C to 40C. If your environment can meet that temp
range, then go with the Globtek unit. If you need the extra comfort on the
high temp end, then spring for the cash and get the Lambda unit. See the
spec sheet at http://www.globtek.com/datasheets/pdf/rt_m_3s150.pdf. Again,
the current rating is continuous.

Hth,

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!
 
Dave,
Thanks for looking at this and answering my questions. It appears, based
on the operating temperatures, the Lambda is better suited for my need.
The Globtek's lower limit of 0 degrees is too high for my need. One
individual in another list said: "The current handling and regulation is
useless if it does not specify a derating curve. Most I bought from
other brands derates by as much as 20-35% in current rating between
10-60Celsius. Most manufacturers derating curves are bogus and you have
to learn the hard way. I learnt the hard way."
This individual uses SOLA and recommends it as well as Lambda. He said
Lambda is good but costs more. Initially I could not find a SOLA that
would meet my needs (and SOLA has not answered my week old email
message) but I am having better success now. Maybe I can find one that
does not cost over $200.

Thanks for the link to the Lambda data sheet. I had run across this in
my searches, but could not find it again. I believe the JWS100 series
includes the JWS100-24/A power supply that was mentioned in my original
post, but I notice in the data sheet that line 10 "Output Voltage Range"
shows 8.9~9.9 V. I do not know how this relates to the output voltage of
24V.

Stan

Tweetldee wrote:

"Stanley A. Gorodenski" <stan_gorodenski@asualumni.org> wrote in message
news:1094927833.544110@news.commspeed.net...


I know very little about electronics. I need an ac-dc regulated 24 vdc 5
amp minimum (preferably, but 4 amp may do). I found a Lambda data sheet
at: http://www.lambdapower.com/ftp/Specs/jws.pdf
The model I am looking into is JWS100-24/A. They list a maximum current
of 4.5 amps. Does anyone know if this is supposed to be a surge current,
or the maximum
that can be drawn continuously? One supplier (Allied Electronics) states
"24 volts @ 3.6 amps" yet the Lambda data sheet says 4.5 amps max which
makes me think the 4.5 amps is a surge current.

I need a regulated power supply, but the data sheet on the Lambda power
supply does not indicate if it is regulated by using such terms as
"regulated" or "closed loop". Can one tell from the data sheet if it is
regulated? When I ask this question to the people (women) at Lambda,
all they do is send me the data sheet and say they hope this helps (on
two occasions).

One individual on another list recommended a 24 volt 6.5 amp switching
power supply at Alllied Electronics:



http://www.allelectronics.com/cgi-bin/category.cgi?category=480&item=PS-2465&type=store


A second individual said from experience to use a better power supply
from companies like SOLA, LAMBDA, VOGEN, and TRACO and made reference to
derating curves. The Lambda power supply mentioned above is a lot more
expensive than the Allied Electronics power supply: over $200 vs about
$35. Is the higher price for the Lambda really worth it? It will be used
to drive two servo motors on a telescope and I need good and consistent
telescope tracking accuracy. It seems like I am having a hard time
finding a 24 vdc power supply at the amp rating I need in the better
quality brands, but it seems cheaper ones, like the Allied Electronics
one, are easier to find. I do not know what to think.

Stan





Stan, take a look at the JWS100 series spec at
http://www.lambdapower.com/ftp/Specs/Jws100_Spc.PDF. It shows that this PS
will run at full load at temps from -10C to +50C in a standard mounting
configuration. It can go up to +60C with derating, (see spce sheet). See
the spec sheet for mounting configurations that are allowed.
The 4.5A current rating is a continuous rating. Overcurrent protection
kicks in at 4.72A. Yes, the PS is very definitely regulated, and can be
remotely sensed. That means that the power supply can regulate the voltage
right at the load, automatically compensating for voltage drop in the wiring
between the PS and the load. Of course, it can also be locally sensed (the
default configuration), which means that the voltage is regulated only to
the terminals on the PS, and does not compensate for wiring voltage drop.

The Globtek unit appears to be adequate for your needs, at much lower cost.
However, it doesn't have the operating temperature range that the Lambda
unit has.. only from 0C to 40C. If your environment can meet that temp
range, then go with the Globtek unit. If you need the extra comfort on the
high temp end, then spring for the cash and get the Lambda unit. See the
spec sheet at http://www.globtek.com/datasheets/pdf/rt_m_3s150.pdf. Again,
the current rating is continuous.

Hth,
Click to expand...
 
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