￭
Measuring the insulation resistance of the brake resistor circuit
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or death,
or damage to the equipment can occur. If you are not a qualified electrical
professional, do not do installation, commissioning or maintenance work.
1. Stop the drive and do the steps in section Electrical safety
precautions (page 18) 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 more than 1 Mohm.
R-
R+
ohm
PE
1000 V DC,
> 1 Mohm
Grounding system compatibility check – North America
This section is applicable to the UL (NEC) drive types.
￭
EMC filter
The drive has an internal EMC filter as standard. In the UL (NEC) drive types, the
filter is disconnected by default. The filter is typically not necessary in North
American installations.
If you are concerned with EMC issues, and install the drive to a symmetrically
grounded TN-S system (center-grounded wye), you can connect the internal EMC
filter. See Disconnecting the ground-to-phase varistor, or connecting the EMC
filter (page 96).
Note: When the internal EMC filter is disconnected, the electromagnetic
compatibility of the drive is decreased.
Electrical installation – North America 93
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