ABB ACH480 Series - Guidelines for Installing the Drive to a TT System; Identifying the Earthing System of the Electrical Power Network

￭ Guidelines for installing the drive to a TT system
You can install the drive to a TT system under these conditions:
1. There is a residual current device in the supply system
2. The internal EMC filter is disconnected. If the EMC filter is not disconnected, its
leakage current will cause the residual current device to trip.
Note:
• ABB does not guarantee the EMC category, because the internal EMC filter is
disconnected.
• ABB does not guarantee the functioning of the ground leakage detector built inside
the drive.
• In large systems the residual current device can trip without a real reason.
￭ Identifying the earthing system of the electrical power network
WARNING!
Only a qualified electrical professional may do the work instructed in this section.
Depending on the installation site, the work may even be categorized as live
working. Continue only if you are an electrical professional certified for the work.
Obey the local regulations. If you ignore them, injury or death can occur.
To identify the earthing system, examine the supply transformer connection. See the
applicable electrical diagrams of the building. If that is not possible, measure these
voltages at the distribution board, and use the table to define the earthing system type.
1. input voltage line to line (U
L-L
)
2. input voltage line 1 to ground (U
L1-G
)
3. input voltage line 2 to ground (U
L2-G
)
4. input voltage line 3 to ground (U
L3-G
).
Electrical installation – IEC 67