Ground-To-Phase Varistor - ABB ACQ580-01 Quick Installation And Start-Up Manual

18 EN – R1...R4 Quick installation guide
in chapter Technical data in ACQ580-01 (0.75 to 250 kW, 1.0 to 350 hp) hardware
manual (3AXD50000044862 [English]).
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Ground-to-phase varistor

A drive with the ground-to-phase varistor connected can be installed to a
R1-
symmetrically grounded TN-S system. If you install the drive to another system, you
R4
may need to disconnect the varistor. See section See section Checking the
R5
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
R6-
manual (3AXD50000044862
R9
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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