Protect PV.500_MH Operating Instructions
5.2Description of Fan Control
5.2.1General
The equipment features
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
5.2.2Fan Control, Cabinet Fan
As soon as the equipment's control module is supplied with volt- age, fan control always starts with the fast fan stage. 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, when the fans are switched off, the highest temperature from the two sensors rises above a certain value, fan control switches to the fast fan stage.
Initialisation
Unit exhaust
air temperature
> limit value
Fast fan stage, | |
minimum time! | |
Unit exhaust air | Unit exhaust air |
temperature > limit | temperature < limit |
value | value |
Slow fan stage | |
| Unit exhaust air |
| temperature < limit |
| value |
Fan switched off | |
Figure 7 | Fan control |
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