ABB ACH480 - Guidelines for installing the drive to a TT system; Identifying the grounding 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 performance, 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 grounding 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 grounding 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
grounding 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 – North America 97