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Protect PV.500 Operating Instructions
80000031354 BAL 31 of 70
5.2 Description of Fan Control
5.2.1 General
The equipment features temperature-dependent fan control.
The fans are either switched off, run on a fast or slow fan stage
(cabinet fan only) or are gradually speeded up or slowed down
(stack fan only).
Fan control:
Extends the operating time of the fans
Minimises the noise generated by the fans
Improves the efficiency of the equipment by reducing its power
consumption
5.2.2 Fan Control, Cabinet Fan
As soon as the equipment's control module is supplied with
voltage, fan control always starts with the fast fan stage. This
means that the control can be restarted to check whether the fans
are working correctly. For example, after maintenance work, it is
not necessary to wait for the fans to reach the temperature
criterion to switch on the fast fan stage.
The fast fan stage is always active for at least a certain time. The
unit exhaust air temperatures are checked after this time. If the
highest temperature from the two sensors is below a certain value,
the fan control switches to the slow fan stage.
The unit exhaust air temperatures are also checked in the slow fan
stage. If the highest temperature from the two sensors is below a
certain value, the fans are switched off. If the highest temperature
rises again during operation with the lower fan stage, fan control
switches to the fast fan stage.
If the highest temperature from the two sensors rises above a
certain value with the fans switched off, fan control switches to the
fast fan stage.
Slow fan stage
Fan switched off
Unit exhaust air
temperature < limit
value
Initialisation
Fast fan stage,
minimum time!
Unit exhaust air
temperature < limit
value
Unit exhaust air
temperature > limit
value
Unit exhaust
air temperature
> limit value
Figure 7 Fan control
35


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