1.
Stop the drive and do the steps in section Electrical safety precautions (page 14) before
you start the work.
2. Make sure that the resistor cable is connected to the resistor and disconnected from
the drive output terminals.
3. At the drive end, connect the R+ and R- conductors of the resistor cable together.
Measure the insulation resistance between the conductors and the PE conductor with
a measuring voltage of 1000 V DC. The insulation resistance must be higher than
1 Mohm.
R-
R+
ohm
PE
1 kV DC,
> 1 Mohm
Earthing system compatibility check – IEC
This section is valid for the IEC drive types. For the UL(NEC) drive types, see Earthing
system compatibility check – North America (page 71).
￭ EMC filter compatibility
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 53).
Note: If you disconnect the EMC filter, the electromagnetic compatibility of the drive
decreases.
￭ Ground-to-phase varistor compatibility
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.
￭ When to disconnect EMC filter or ground-to-phase varistor
The table below 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.
Electrical installation – IEC 53
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