Delta, And Tt Systems; Emc Filter; Ground-To-Phase Varistor - ABB ACQ580-01 Quick Installation And Start-Up Manual

motor must exceed 100 Mohm (reference value at 25 °C or 77 °F). For the
insulation resistance of motors, see the manufacturer's instructions.
Note: Moisture inside the motor casing will reduce the insulation resistance. If
moisture is suspected, dry the motor and repeat the measurement.
Check the compatibility with IT (ungrounded), corner-
grounded delta, midpoint-grounded delta, and TT systems
See figure C on page


EMC filter

A drive with the internal EMC filter 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 section Checking the compatibility with IT
(ungrounded), corner-grounded delta, midpoint-grounded delta, and TT systems (for
IEC) in ACQ580-01 (0.75 to 250 kW, 1.0 to 350 hp) hardware manual
(3AXD50000044862 [English]).
WARNING! Do not install a drive with the EMC filter connected to a system
that the filter is not suitable for. This can cause danger, or damage the drive.
Note: When the internal EMC filter is disconnected, the EMC compatibility of the
drive is considerably reduced. See section EMC compatibility and motor cable length
in chapter Technical data in ACQ580-01 (0.75 to 250 kW, 1.0 to 350 hp) hardware
manual (3AXD50000044862 [English]).


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 section See section Checking the
compatibility with IT (ungrounded), corner-grounded delta, midpoint-grounded delta,
and TT systems (for IEC) in ACQ580-01 (0.75 to 250 kW, 1.0 to 350 hp) hardware
manual (3AXD50000044862 [English]).
WARNING! Do not install a 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.
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