Electrical Installation; Checking The Compatibility With It (Ungrounded) And Corner Grounded Tn Systems - ABB ACS310 User Manual

4. Electrical installation

WARNING! The work described in this chapter may only be carried out by a
qualified electrician. Follow the instructions in chapter
Ignoring the safety instructions can cause injury or death.
Make sure that the drive is disconnected from the input power during installation. If
the drive is already connected to the input power, wait for 5 minutes after
disconnecting the input power.
Checking the compatibility with IT (ungrounded) and
corner grounded TN systems
WARNING! If a drive whose EMC filter is not disconnected is installed on an IT
system (an ungrounded power system or a high resistance-grounded [over
30 ohms] power system), the system will be connected to ground potential through
the EMC filter capacitors of the drive. This may cause danger or damage the drive.
If a drive whose EMC filter is not disconnected is installed on a corner grounded TN
system, the drive will be damaged.
1. If you have an IT (ungrounded) or corner grounded TN system, disconnect the
internal EMC filter by removing the EMC screw. For 3-phase U-type drives (with
type designation ACS310-03U-), the EMC screw is already removed at the factory
and replaced by a plastic one.
1
Electrical installation 13
Safety
Note: In frame size R4
the EMC screw is located
to the right of terminal W2.
on page 5.