3 Installation3.3 Electrical Installation48 DE1 variable speed starter 09/14 MN040011EN www.eaton.com3.3.6 Motor connectionThe connection between the DE1 variable speed starter and the motorshould be as short as possible. The motor connection cable should bescreened in order for the installation to meet EMC requirements.▶ Connect the screening, on both sides and across a large area(360° overlap), to the protective earth (PE). The power screening'sprotective earth (PES) connection should be in the immediate proximityof the DE1 variable speed starter and directly on the motor terminal box.figure 37: Motor side connection▶ Prevent the screening from becoming unbraided, e.g. by pushing theopened plastic sheath over the end of the screening or with a rubbergrommet on the end of the screening.Alternatively, in addition to the large-area gland plate, you can also twistthe screen braid at the end and connect it to the protective earth. Inorder to prevent EMC interference, this twisted screen connectionshould be as short as possible (recommended value for the twistedcable screen: b ≧ 1/5 a).Screened, four-wire cable is recommended for the motor cables. The green-yellow line of this cable connects the protective ground connections from themotor and the variable speed starter and therefore minimizes the equalizingcurrent loads on the shielding braid.figure 38: Screened connection cable in motor circuit0 V +10 V 1 2 3 4 13 1415 mm(0.59’’)PESa bPES
