• Guidelines for installing the drive to a TT system (page 62)• Disconnecting EMC filter and ground-to-phase varistor (page 63)WARNING!Do not install the drive with the ground-to-phase varistor connected to a systemthat the varistor is not suitable for. If you do, the varistor circuit can be damaged.￭ Corner-grounded and midpoint-grounded delta systemsWARNING!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 damageto the drive.￭ When to disconnect EMC filter and ground-to-phase varistor: TN-S,IT, corner-grounded delta, and midpoint-grounded delta systemsRequirements for disconnecting EMC filter and varistor and additional requirements fordifferent electrical power systems are given below.Symmetrically grounded TN systems (TN-S systems)Do not disconnect EMC AC and VAR wires.PEL2L3L1NCorner-grounded delta systemsDo not install the drive on a corner-grounded system.PEL3L2L1Midpoint-grounded delta systemsElectrical installation 6111
