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Profoto D1
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Adaptive thermal control
The D1 unit is equipped with an adaptive thermal control system. If there is risk for
over heating of the unit, caused by either heavy use or abnormal external influence, the
thermal control system will automatically protect the unit from damage. A microprocessor
supervises and controls the unit, based on input from four thermal sensors. If the sensors
report an increase in temperature, the microprocessor automatically takes measures
to protect the unit. The first measure is to increase the fan speed. If the fan at full speed
cannot bring the temperature down, the modeling light will automatically be turned off
during recharging. Next step is to turn off the modeling light completely and at the same
time slow down the recharging. Eventually the recharging will stop completely. After a
while, when the temperature has decreased sufficiently, the unit will start recharging at a
normal pace. This automatic protection will only interfere under extreme conditions, such
as when the air vents are blocked.
Depending on version, the D1 unit is designed to withstand up to 1000 full power flashes
during one hour. However, it is not recommended to run harder than necessary due to the
lifetime of the flash tube.
If a defective flash head – for example with a broken or misfiring flash tube – is used, after
releasing the flash a long beep signal will indicate malfunction/underexposure.
Notice:
The air vents of the unit must never be blocked or covered in any way. Never store your flash equipment in a car on
a hot and sunny day. Never use a D1 unit that is placed inside a case or transport box. Avoid storing the unit close or
below the freezing point. A cold unit may not work properly or may even brake and will lose capacity (flash output).
There is also a risk of failure because of condensation when a cold generator is moved to a warmer surrounding. Do
not expose any flash equipment to wet or humid environments or extreme electro-magnetic fields.