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IC 40 function > Analogue operating modes 21 – 27
4.6.8 Safety closing function
The safety closing function cuts in in the event of a fault
or interruption of the continuous supply voltage (power)
or, for instance, in the event of a motor defect.
A pre-tensioned spiral spring turns the drive shaft with
valve disc against the mechanical stop of the butterfly
valve to the “closed” position within the closing time tS <
1 s.
Fast and reliable closing prevents air being able to flow
into the furnace or kiln chamber in uncontrolled manner
if the installation is disconnected from the electrical
power supply or in the event of a device defect. The
penetration of air may also lead to damage to the
material in the furnace or kiln in extreme cases, besides
changing the furnace or kiln atmosphere.
In order to maximize the service life of the parts subject to
wear in the actuator and in the butterfly valve, the safety
closing function should be used only for the scheduled
closing
function and not for controlled shut-down or for
intermittent switching of the burner.
The safety closing function is available as an option on
the actuator IC 40S and can be implemented only in
combination with the butterfly valve BVHS. Both actuator
and butterfly valve must feature this function, see page
69 (Selection). 52
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