High Country Tek HFS - Manual (Page 28)

Hydraulic Fan System Controller: HFS
The electronic components used in this controller released by HCT, conform to the Commercial temperature range
which is -40° to +75 ° Centigrade. This rating means that the components will work reliably and give a good life span
if the operating temperature is kept within these ( absolute maximum ) limits.
The controllers when in operation do generate and dissipate internal heat. The amount of heat generated is
dependent on the amount of work that the controller is being asked to do as well as other factors such as supply
voltage, type and voltage of coil being driven e.t.c. with the worst case combination being a 24VDC supply with a 12V
coil.
In order for the unit not to exceed the +75°C maximum operating temp and cause a „self-protection‟ shut down
situation, the user must mount the controller in a position that is ergonomically preferred especially for visual
inspection and system maintenance and also provide for adequate ventilation to ensure that the unit is cooled to
maintain operation.
In addition to ventilation, the system designer must also look at the mounting arrangement for the cards / controllers
and be aware that adequate space should be left around, in-front and behind to allow the above ventilation to take
effect.
It should be noted that temperatures are ‘Additive’ which means that with a high ambient temperature, the units
internal temperature rise need only be quite small to reach the maximum specified levels.
If controllers are going to be used in High ambient temperature or unusual application areas, please contact the
customer service personnel at HCT for advice on cooling and mounting.
Notes:-
• Enclosures should have an „IN‟ and an „OUT‟ vent for correct cooling air circulation.
• Mount the controller so the operator can see it if required to do so.
• Use „fan-blown‟ air wherever possible to increase air exchange rate.
• DO NOT mount controllers in direct sunlight.
• Mount controllers with „air-gaps‟ to allow correct ventilation.
• Do not mount controllers in non-ventilated sealed box‟s especially in high ambient areas.
• DO NOT mount controllers „face-face‟ or densely as this will cause over-heating problems.
• Read the literature and observe the max operating temp figures and work to them.
• Remember…High temp. ambient air used for „cooling‟ is not a good solution !!
Controller Mounting:
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