Filter Noise Level; Airflow And Cooling Requirements - ABB PQFS Installation, Operation And Maintenance Instructions

For additional units, the same procedure has to be followed.
5.5

Filter noise level

Active filters produce a certain level of noise when they operate. The noise level depends
on the operating conditions of the unit. The maximum typical noise level is 67dBA. These
values should be taken into account when choosing a location for the filter.
5.6

Airflow and cooling requirements

The PQFS dissipates an amount of heat that has to be evacuated out of the room where
the filter is located. Otherwise, excessive temperature rise may be experienced. Please
note that life of the electrical equipment decreases drastically if the operating temperature
exceeds the allowable limit (divided by 2 every 10°C/23°F).
Each PQFS power unit has their own cooling fans. The air intakes are located at the
bottom of the unit. From the bottom, the air flows through the enclosure and is then
routed to the top of the enclosure. For proper cooling, a minimum airflow of cooling air
has to be supplied to each unit.
ratings.
Please ensure that the air used for cooling is regularly renewed and does not contain
conductive particles, significant amounts of dust, or corrosive or otherwise harmful gases.
The cooling air intake temperature must not exceed 40°C under any operating condition.
32 Mechanical design and installation ç Manual Power Quality Filter PQFS
Figure 24: Mounting of filter blocking screws in the fixation bar
· By means of a lower end fixation screw (not provided) the enclosure can be
pushed against the rear support at the bottom also (see
Figure 25: View of the lower end fixation hole
· Remove the ribbon that has served to lift the filter.
Unit rating
£ 60A
> 60A
Table 14 gives the airflow requirements for different unit
Table 14: Airflow requirement
Airflow requirement (m³/h)
400 m³/h
600 m³/h
Figure 25)