￭ EMC filter
The drive has an internal EMC filter as standard. You can install the drive to a
symmetrically grounded TN-S system. If you install the drive to another system, you
may need to disconnect the EMC filter. See When to disconnect EMC filter or
ground-to-phase varistor (page 64).
Note: If you disconnect the EMC filter, the electromagnetic compatibility of the drive
decreases.
WARNING!
Do not install a drive with the internal EMC filter connected to an earthing system
that the EMC filter is not suitable for (for example, an IT system). The supply
network becomes connected to ground potential through the internal EMC filter
capacitors, which can cause danger or damage to the drive.
￭ Ground-to-phase varistor
A drive with the ground-to-phase varistor connected can be installed to a symmetrically
grounded TN-S system. If you install the drive to another system, you may need to
disconnect the varistor. See When to disconnect EMC filter or ground-to-phase varistor.
WARNING!
Do not install the drive with the ground-to-phase varistor connected to a system
that the varistor is not suitable for. If you do, the varistor circuit can be damaged.
￭ When to disconnect EMC filter or ground-to-phase varistor
The table shows different earthing systems, and when you need to disconnect the EMC
filter (metal EMC screw) or ground-to-phase varistor (metal VAR screw).
WARNING!
Remove the metal EMC screw in systems other than the symmetrically grounded
TN-S systems. If you do not, it can cause danger or damage to the drive.
64 Electrical installation – IEC
To Next Page
Loading...
