ABB ACS880-34 Series - Compatibility with IT (ungrounded), corner-grounded delta, midpoint-grounded delta, and TT systems

Compatibility with IT (ungrounded), corner-grounded delta,
midpoint-grounded delta, and TT systems
￭ EMC filter (option +E202)
A drive with EMC filter +E202 (ARFI-10) connected can be installed to a symmetrically
grounded TN-S system. If you install the drive to another system, you may need to disconnect
the EMC filter. See sections:
•
When to disconnect EMC filter (option +E202) or ground-to-phase varistor: TN-S, IT,
corner-grounded delta, and midpoint-grounded delta system (page 95)
•
Guidelines for installing the drive to a TT system (page 97)
•
Disconnecting EMC filter and ground-to-phase varistor (page 97).
WARNING!
Do not install a drive equipped with EMC filter +E202 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 can cause danger, or damage the drive.
Note: When the EMC filter is disconnected, the drive EMC compatibility is considerably
reduced.
￭ Ground-to-phase varistor
A drive with the ground-to-phase varistor connected can be installed to a symmetrically
grounded TN-S system. If you install the drive to another system, you may need to disconnect
the varistor. See sections
• When to disconnect EMC filter (option +E202) or ground-to-phase varistor: TN-S, IT,
corner-grounded delta, and midpoint-grounded delta system
• Guidelines for installing the drive to a TT system
• Disconnecting EMC filter and ground-to-phase varistor.
WARNING!
Do not install the drive with the ground-to-phase varistor connected to a system
that the varistor is not suitable for. If you do, the varistor circuit can be damaged.
￭ Corner-grounded and midpoint-grounded delta systems
WARNING! Do not install the drive on a corner-grounded or midpoint-grounded
delta system. Disconnecting the EMC filter and ground-to-phase varistor does not
prevent damage to the drive.
￭ When to disconnect EMC filter (option +E202) or ground-to-phase
varistor: TN-S, IT, corner-grounded delta, and midpoint-grounded delta
system
Symmetrically grounded TN systems (TN-S systems)
Electrical installation 95
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