B
bob haller
Guest
120 volt in, 35 volts out 1.2 amps I am having a hard time finding a
35 or 36 volts out transformer.
35 or 36 volts out transformer.
E
ehsjr
Guest
bob haller wrote:
Primaries in parallel, secondaries in series in phase.
# ----------+
---+-------)||( |
120VAC | )||( 18VAC |
| )||( |
-------+---)||( |
| | ----+ +-----
| | | 36VAC
| | # ----+ +-----
+-------)||( |
| )||( 18VAC |
| )||( |
+---)||( |
----------+
The transformers in the above example are MPJA #7843 TR
http://www.mpja.com/prodinfo.asp?number=7843+TR
They cost $5.63 each and are rated at 18V 2.0 amps secondary.
The # symbol is for phasing. The secondaries have center
taps - don't use them.
Ed
2 transformers, 18V secondaries, 120V primaries.
Primaries in parallel, secondaries in series in phase.
# ----------+
---+-------)||( |
120VAC | )||( 18VAC |
| )||( |
-------+---)||( |
| | ----+ +-----
| | | 36VAC
| | # ----+ +-----
+-------)||( |
| )||( 18VAC |
| )||( |
+---)||( |
----------+
The transformers in the above example are MPJA #7843 TR
http://www.mpja.com/prodinfo.asp?number=7843+TR
They cost $5.63 each and are rated at 18V 2.0 amps secondary.
The # symbol is for phasing. The secondaries have center
taps - don't use them.
Ed
B
baron
Guest
ehsjr Inscribed thus:
transformer with a 38v AC output at about 2amps. I still use one !
When I get home I'll crawl under the bench and have a look.
--
Best Regards:
Baron.
Probably no help, but I recall that the old Deskjet 500 printer used a
transformer with a 38v AC output at about 2amps. I still use one !
When I get home I'll crawl under the bench and have a look.
--
Best Regards:
Baron.
M
Michael Black
Guest
On Tue, 19 Jan 2010, bob haller wrote:
What do you need it for? That factors in, since it defines how close
the voltage has to be, and such.
I once needed 24DC to run a Mac Powerbook, and while digging around to
find a suitable transformer, I remembered the inkjet printers I had lying
around. I opened one up, and immediately found a switching supply that
was easy to extract, and provided 24vdc of suitable amperage. That beat
finding a good enough transformer and then building a power supply. But
being able to do that depends on what the transformer is needed for.
Michael
What do you need it for? That factors in, since it defines how close
the voltage has to be, and such.
I once needed 24DC to run a Mac Powerbook, and while digging around to
find a suitable transformer, I remembered the inkjet printers I had lying
around. I opened one up, and immediately found a switching supply that
was easy to extract, and provided 24vdc of suitable amperage. That beat
finding a good enough transformer and then building a power supply. But
being able to do that depends on what the transformer is needed for.
Michael
Guest
On Tue, 19 Jan 2010 19:14:43 -0800 (PST), bob haller <hallerb@aol.com>
wrote:
http://skycraftsurplus.com/36vac.aspx
36volts CT at 2.8 amps
$8.00 plus shipping
John
wrote:
How about this one?
http://skycraftsurplus.com/36vac.aspx
36volts CT at 2.8 amps
$8.00 plus shipping
John
B
Baron
Guest
baron Inscribed thus:
--
Best Regards:
Baron.
rated 38v.
--
Best Regards:
Baron.
B
bob haller
Guest
On Jan 20, 3:34�pm, Baron <baron.nos...@linuxmaniac.nospam.net> wrote:
for $2500.00 but GBC has discontinued it and all parts support. If it
were the typical cheap 200 buck machine I wouldnt waste my time.
But this is a nice unit in awesome condition. I was told some
transformers have thermal fuses buried in the outer windings, so I
will do a autopsey tonight.
I am in pittsburgh PA My business is the repair of all brands of roll
laminators, including Seal, GBC, Laminex, USI, IDEX, Banner, D&K, and
some others.
GBC a ACCO BRANDS company appears in trouble. They cut pay to all
employees.
Meanwhile their field service raised their per hour rate from 250
bucks for the first hour to 295 bucks. This includes travel but is way
too much for fixing a $1300.00 machine.
I charge a 100 bucks a hour
These machines apply plastic to paper think menus. And thanks for the
help!
This is used in a GBC pouch laminator, they are still being sold new
for $2500.00 but GBC has discontinued it and all parts support. If it
were the typical cheap 200 buck machine I wouldnt waste my time.
But this is a nice unit in awesome condition. I was told some
transformers have thermal fuses buried in the outer windings, so I
will do a autopsey tonight.
I am in pittsburgh PA My business is the repair of all brands of roll
laminators, including Seal, GBC, Laminex, USI, IDEX, Banner, D&K, and
some others.
GBC a ACCO BRANDS company appears in trouble. They cut pay to all
employees.
Meanwhile their field service raised their per hour rate from 250
bucks for the first hour to 295 bucks. This includes travel but is way
too much for fixing a $1300.00 machine.
I charge a 100 bucks a hour
These machines apply plastic to paper think menus. And thanks for the
help!
B
bob haller
Guest
On Jan 20, 6:16�pm, bob haller <hall...@aol.com> wrote:
Hopefully that will fix the machine. Epoxy will put it back together
again.
How sad to toss a transformer for the lack of a fuse
Thermal fuse was blown, it was on the outside of the input winding.On Jan 20, 3:34 pm, Baron <baron.nos...@linuxmaniac.nospam.net> wrote:
baron Inscribed thus:
ehsjr Inscribed thus:
bob haller wrote:
120 volt in, 35 volts out 1.2 amps I am having a hard time finding a
35 or 36 volts out transformer.
2 transformers, 18V secondaries, 120V primaries.
Primaries in parallel, secondaries in series in phase.
# ----------+
---+-------)||( |
120VAC | )||( 18VAC |
| )||( |
-------+---)||( |
| | ----+ +-----
| | | 36VAC
| | # ----+ +-----
+-------)||( |
| )||( 18VAC |
| )||( |
+---)||( |
----------+
The transformers in the above example are MPJA #7843 TR
http://www.mpja.com/prodinfo.asp?number=7843+TR
They cost $5.63 each and are rated at 18V 2.0 amps secondary.
The # symbol is for phasing. The secondaries have center
taps - don't use them.
Ed
Probably no help, but I recall that the old Deskjet 500 printer used a
transformer with a 38v AC output at about 2amps. I still use one !
When I get home I'll crawl under the bench and have a look.
Sorry I was mistaken ! Its 20v @ 2.4amps. I was sure that I'd seen one
rated 38v.
--
Best Regards:
Baron.- Hide quoted text -
- Show quoted text -
This is used in a GBC pouch laminator, they are still being sold new
for $2500.00 but GBC has discontinued it and all parts support. If it
were the typical cheap 200 buck machine I wouldnt waste my time.
But this is a nice unit in awesome condition. I was told some
transformers have thermal fuses buried in the outer windings, so I
will do a autopsey tonight.
I am in pittsburgh PA My business is the repair of all brands of roll
laminators, including Seal, GBC, Laminex, USI, IDEX, Banner, D&K, and
some others.
GBC a ACCO BRANDS company appears in trouble. They cut pay to all
employees.
Meanwhile their field service raised their per hour rate from 250
bucks for the first hour to 295 bucks. This includes travel but is way
too much for fixing a $1300.00 machine.
I charge a 100 bucks a hour
These machines apply plastic to paper think menus. And thanks for the
help!- Hide quoted text -
- Show quoted text -
Hopefully that will fix the machine. Epoxy will put it back together
again.
How sad to toss a transformer for the lack of a fuse
P
Paul E. Schoen
Guest
"bob haller" <hallerb@aol.com> wrote in message
news:a79f2299-3770-4101-9eff-ff1abe3356c8@h2g2000yqj.googlegroups.com...
Thermal fuse was blown, it was on the outside of the input winding.
Hopefully that will fix the machine. Epoxy will put it back together
again.
How sad to toss a transformer for the lack of a fuse
==========================================================================
Still it is important to determine what might have blown the fuse. Most
thermal fuses are rated high enough that when they open, the temperature is
high enough to have caused damage to the insulation. It would be prudent to
replace it with another thermal fuse. To make sure there is no damage,
check the primary current under no-load conditions, and also perform a
hipot check between windings. Then operate the unit under normal conditions
and check for excess current draw or overheating.
Paul
news:a79f2299-3770-4101-9eff-ff1abe3356c8@h2g2000yqj.googlegroups.com...
Thermal fuse was blown, it was on the outside of the input winding.
Hopefully that will fix the machine. Epoxy will put it back together
again.
How sad to toss a transformer for the lack of a fuse
==========================================================================
Still it is important to determine what might have blown the fuse. Most
thermal fuses are rated high enough that when they open, the temperature is
high enough to have caused damage to the insulation. It would be prudent to
replace it with another thermal fuse. To make sure there is no damage,
check the primary current under no-load conditions, and also perform a
hipot check between windings. Then operate the unit under normal conditions
and check for excess current draw or overheating.
Paul
J
John Fields
Guest
On Wed, 20 Jan 2010 20:54:01 -0800 (PST), bob haller <hallerb@aol.com>
wrote:
Did you replace the fuse?
JF
wrote:
---Thermal fuse was blown, it was on the outside of the input winding.
Hopefully that will fix the machine. Epoxy will put it back together
again.
How sad to toss a transformer for the lack of a fuse
Did you replace the fuse?
JF
B
bob haller
Guest
On Jan 21, 2:16�pm, John Fields <jfie...@austininstruments.com> wrote:
plus i will add a regular fuse too.
the transformer looked brand new, no signs of overheating.
since many machines i repair use thermal fuses I have some
observations
They do fail as designed when overheated.
When in high current uses they appear to fatigue fail.
Not from overheating but too many thermal cycles.
One manufacturer has this problem, So I put 3 10 amp thermal fuses
together in a parrell bundle.
I believe this will end the blown thermal fuse for no reason.
Its irritating and expensive to drive 100 miles just to replace a aged
thermal fuse.
since most of my machines are under maintence these trips arent
billable and just cost me time and money
yeah had a fuseOn Wed, 20 Jan 2010 20:54:01 -0800 (PST), bob haller <hall...@aol.com
wrote:
Thermal fuse was blown, it was on the outside of �the input winding.
Hopefully that will fix the machine. Epoxy will put it back together
again.
How sad to toss a transformer for the lack of a fuse
---
Did you replace the fuse?
JF
plus i will add a regular fuse too.the transformer looked brand new, no signs of overheating.
since many machines i repair use thermal fuses I have some
observations
They do fail as designed when overheated.
When in high current uses they appear to fatigue fail.
Not from overheating but too many thermal cycles.
One manufacturer has this problem, So I put 3 10 amp thermal fuses
together in a parrell bundle.
I believe this will end the blown thermal fuse for no reason.
Its irritating and expensive to drive 100 miles just to replace a aged
thermal fuse.
since most of my machines are under maintence these trips arent
billable and just cost me time and money