44 Electrical design and installation  Manual Power Quality Filter PQFS
Table 22: Control circuit fuse characteristics for PQFS filters
network
voltage (Vrms)
fuse type
(Arms)
(kA) at rated
voltage
X 38 gG/gl
Remark:
(a)
fuse short circuit current capability
WARNING: Once the auxiliary fuse box is closed, the DC bus is automatically charged
when the upstream network is live. Therefore, close the auxiliary circuit only when the
upstream power circuit is not live. Failure to adhere to this guideline may result in
injury or death.
6.8 Connection of the PQFS to the network
WARNING: The PQF has to be installed in parallel with the loads, preferably on a free
feeder. Local regulations and requirements prevail in determining how the equipment
has to be connected to the network. The feeding cables to the filter must be protected
by their own cable and equipment protection device (see Section 6.7).
WARNING: The PQF can operate on networks with nominal voltage in the range 208-
240 V and 380-415 V. The unit must be configured for the operation range it will be
used on. Follow the guidelines in this section to ensure that the hardware is configured
properly. Failure to do so may lead to filter damage.
For applications where predominantly 3 phase loads are present and where there is no
need for neutral current filtering nor line to neutral balancing, connect the active filter
in 3-Wire mode.
For applications where predominantly single-phase loads are present and where there
is a need for neutral current filtering and/or line to neutral balancing, connect the
active filter in 4-Wire mode.
NOTE: When installing an active filter in installations containing power factor
correction capacitor banks, it is recommended to use detuned capacitor banks and to
connect the capacitor banks upstream of the filter measurement CTs.
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