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Instruction Manual
AFQm
The correct connection of the current transformers is vital for the AFQm filters to op-
erate properly. If the phases L1, L2 and L3 are switched in the secondary, the filter will
not work properly.
The AFQm devices have built-in fuse overcurrent protection.
Install external protection according to the type of installation, the facility’s maximum
short-circuit current, the maximum fuse current, and the regulations in force at the
place of installation.
If local regulations require the use of earth leakage protection devices, only DC sensi-
tive RCD (RCD type B) should be used with AFQm. Active filters work internally with DC
currents, and, in case of failure, the DC currents may produce malfunction on type A
RCD devices.
Ensure that the installation of the device in your electric distribution system (TN, VT, IT)
complies with current standards.
Check that there is a neutral in the place where three-phase active filter connections are made with
neutral, AFQm-4WF-xxxx.
The active filter must be of the correct size for the harmonic currents it has to filter and to comply with
the installation's electrical features.
Check section “4.3.- RATED CURRENT DIMENSIONS” to define the correct dimensions of
the device.
Failing to observe the recommendations described in this section might cause the ac-
tive filter to work incorrectly and prevent proper compensation of the installation's
current harmonics.
Do not install various filters in series one after another in the same installation, con-
figured to correct the same disturbances. This can produce an overcompensation of
the disturbances, which could cause instability in the mains (Figure 7)
Figure 7: Do not install various active filters in series.
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