PowerIT LV Active Filter PQFI - ABB Group

When the natural cooling capacity at the location where the filter is installed is not sufficient, air
conditioning systems have to be added to the room. In the design of the air conditioning systems, the filter
heat losses have to be taken into account. Table 6.3. gives an overview of the PQFI heat losses for the
different power units. For multi-unit filters, the values of Table 6.3. have to be multiplied by the number of
filter units. In CE versions of PQFI, one cubicle contains one filter unit. In cULus versions of PQFI, one
filter unit is distributed over two cubicles.
Table 6.3. Filter unit heat losses
Network voltage U (Vrms) Unit rating (Arms) Heat loss (kW)
208 ≤ Ue ≤ 480
250 ≤ 5.2
450 ≤ 11
480 < Ue ≤ 690 (b) 180 (a) ≤ 7.1
320 (a) - (c)
Remark:
(a)
If the nominal system voltage is higher than 600V (Ue > 600V) the current rating
of PQFI units in this voltage range may be derated automatically depending on
the load condition for ambient temperatures higher than 30°C (86°F).
(b)
cULus version of PQFI are limited to 600 Vrms.
(c)
Not available at time of printing.
6.4. Standard cubicle dimensions, fixing holes and clearances
Standard CE versions of PQFI are mounted in cubicles of the Rittal TS8 type and have dimensions of 800
x 600 x 2150 mm (width x depth x height). The cubicles have an elevated roof with lifting lugs. Each
cubicle contains one power unit and is fitted with its own bottom cable entry and breaker. An optional
cable entry cubicle (wxdxh 600 x 600 x 2150 mm) may be provided for top cable entry, single cable entry
point (multi-unit filters).
Standard cULus versions of PQFI are mounted in cubicles of the Rittal TS8 type. Each cULus filter unit is
distributed over two cubicles and is mounted on a base frame. The overall dimensions of a cULus filter
unit are 1400 x 600 x 2250 mm (width x depth x height) including the base frame. The cubicles have an
elevated roof with lifting lugs. The cable entry cubicle houses a main breaker and can be supplied from
the top and the bottom. Slave units also come with their own cable entry cubicle incorporating a
protection breaker.
A filter panel (consisting of one or more power units) can be installed against a wall or back to back to
other cubicles providing that the heat transfer from the other cubicles to the filter cubicle is negligible. If a
high heat transfer is expected, a spacing of 100 mm between the filter panel and the wall or the other
cubicles is recommended. Figure 6.2. and Figure 6.3. show a top view of a typical PQFI installation with
indication of the cubicle fixation holes. For fixing the cubicle to the floor M12 bolts and washers are
recommended.
PQFI - Chapter 6. Mechanical installation 31