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PDF HM199 Data sheet ( Hoja de datos )
| Número de pieza | HM199 | |
| Descripción | Refrigeration Control | |
| Fabricantes | IES | |
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Engineering sample data
MODULE ASSEMBLY
2003 Nov 26
HM199
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INTEGRATED ELECTRONIC SOLUTIONS
1BUTLER DRIVE
HENDON SA 5014
AUSTRALIA
www.DataSheet4U.com
1 page  
Integrated Electronic Solutions, Hendon, South Australia
Refrigeration control with audible
condensor alarm and lockout
Engineering sample data
HM199
6 DIMENSIONS
Power Connector: AMP Plug 0-0350779-1 (4p UMNL PLUG HSG RD) with Pin 0-0350547-1 (Contact pin UMNL)
Potentiometer assembly: 500 mm overall length. Connector Stelvio BS95/3 with CT84 contacts.
Insulated NTC Thermistor probes 2k2 and 47k, length 1200 mm, Plug Molex 09-91-0200 with pin 08-50-0106.
2003 Nov 26
Fig.2 HM199 Dimensions.
5
5 Page 
Integrated Electronic Solutions, Hendon, South Australia
Refrigeration control with audible
condensor alarm and lockout
Engineering sample data
HM199
of the lead for about 50 mm starting
just clear of the sensing “head” of the
lead. Ideally the black plastic head of
the leaded thermistor should all be
clear of the mounting clamp by a
distance of at least 1 to 5 mm.
The sensing head of an insulated
leaded thermistor should never be
clamped in a manner which puts it
under physical pressure. If it is
clamped too tightly, the ceramic
thermal sensing element may be
cracked and damaged.
The plastic covered thermistor does
not have a large thermal mass, and
especially in moving air, will arrive
quite quickly at a temperature very
close to that of the ambient air. The
clamping means can also allow heat
to flow to/from the copper wires
leading to the thermistor, and can
provide a significant modification to
the temperature seen by the
thermistor. If the sensing point is also
associated with a significant thermal
mass such as a shelf or a panel,
averaging, and a thermal delay to
sense ambient changes can result,
possibly providing much more
desirable response characteristics.
However, when mounted in an active
air stream, without thermally
conductive paths to surrounding
objects, it can give sensing which is
very sensitive to even small variations
in air temperature.
13.3 Heatsink and triac
temperature and load
considerations
As the triac junction temperature must
always remain below its rated
maximum temperature, and the
current carrying capability of the
wiring must also be such as to
maintain safe and reliable operation
during life, there are a number of
considerations which must be
examined before a new application is
released to production.
The voltage drop across the triac is
typically 1.5 volts giving a significant
power dissipation at full run current. In
addition the resistance of the wiring
and the printed circuit board tracks
have heat losses. This heat loss
raises the temperature of the triac
junction, and also of the wiring above
the ambient temperature. It is
necessary to ensure that at no time
are rated temperatures exceeded,
and that this heat can be safely
dissipated and carried away.
If the HM199 controller is run in a
warmer ambient environment it must
be checked to ensure that the
temperature rise above ambient
remains within safe limits. It the
temperature rise is found to be
excessive then there a number of
steps that can be taken to ensure safe
operation.
This is discussed in more detail in the
following sections below.
13.3.1 THERMAL CONSIDERATIONS
To prevent overheating there are
three ways in which the heat
generated by the triac and in the
wiring can be dissipated. First the
heat is carried by conduction to a
dissipating surface with sufficient
area to provide a path for the heat into
the surrounding ambient air. This is
the purpose of the HM199 heatsink.
Metals are good conductors of heat,
and can provide effective cooling with
the heat flowing from a warmer area
to a part of the heatsink which is
cooler.
Ultimately the heat is either carried
away by the surrounding ambient air,
or by radiation. At the temperatures at
which the HM199 operates radiation
plays a very small part in effectively
cooling the surfaces.
In cooling the heatsink, the air in
contact with the heatsink is warmed,
and a convection flow over the
surface is induced, the warmer air
being less dense and rising, to be
replaced by cooler air. In this way the
heat is carried away.
If measurement shows this to still be
inadequate, and it is not possible to
increase the surface are of the
heatsink, then it may be necessary to
provide a flow of forced air to make
the cooling more efficient.
While measurement of surface
temperatures in a sample may
indicate a small thermal margin on a
new appliance, it must be
remembered that a poorly situated
heatsink where dust and fluff can
accumulate will lose efficiency as this
unwelcome insulating layer builds up.
Some margin, and filter cleaning
procedure must be allowed to take
this into account.
13.3.2 TRIAC SPECIFICATIONS
The triac BTA208X-600E maximum
junction temperature is 125 °C and its
thermal resistance to the mounting
surface on the heatsink (with white
heat conducting heatsink compound)
is 4 K/W. At 6 Amps load current, its
power dissipation is 7.5 watts giving a
temperature rise from the heatsink
mounting point to the junction of
30 °C.
Therefore the temperature of the
heatsink at the mounting point should
not exceed (125 – 30 ) = 95 °C
Thus allowing for measuring errors,
and a margin for degradation of the
thermal path to the ambient in time, it
would be advisable to not allow the
heatsink to exceed 8 5°C at the
mounting point after extended
operation. Also, at temperatures
much higher than this it would be
seen as a risk of skin burns if the hot
metal was touched.
13.3.3 HEATSINK TEMPERATURE
RISE
Measurements on the HM199 module
gave the following results. In this case
2003 Nov 26
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet HM199.PDF ] | |
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