
Technical data 439
ACH550-01 User's Manual
First environment (drives of category C2)
1. The internal EMC filter is connected.
2. The motor and control cables are selected as specified in
this manual.
3. The drive is installed according to the instructions given in
this manual.
4. The motor cable length does not exceed the allowed
maximum length specified in section Motor cable length on
page 405 for the frame size and switching frequency in use.
WARNING! In a domestic environment, this product may cause
radio inference, in which case supplementary mitigation
measures may be required.
Second environment (drives of category C3)
1. The internal EMC filter is connected.
2. The motor and control cables are selected as specified in
this manual.
3. The drive is installed according to the instructions given in
this manual.
4. The motor cable length does not exceed the allowed
maximum length specified in section Motor cable length on
page 405 for the frame size and switching frequency in use.
WARNING! A drive of category C3 is not intended to be used on
a low-voltage public network which supplies domestic premises.
Radio frequency interference is expected if the drive is used on
such a network.
Note: It is not allowed to install a drive with the internal EMC
filter connected on IT (unearthed) systems. The supply network
becomes connected to earth potential through the EMC filter
capacitors which may cause danger or damage the drive.
Note: It is not allowed to install a drive with the internal EMC
filter connected to a corner-earthed TN system as this would
damage the drive.
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