Winding Resistance Measuring The winding resistance measured at the motor should fall within the values in Tables 13, 22, 24, 25, & 27. This chart shows total resistance of cable from control to motor and back. Normative DIN (German) uses the first letter U mean (or) V, W (electrical machinery) and (R) (S) (T) for electrical terminal phases of 120°. To determine the actual resistance of the aluminum drop cable, divide the ohm readings from this chart by 0.61. resistance between the winding under test and the other two windings which tests for an elevated possibility of a short between the windings. Now, use for start or wey connection single voltageįor start connection join (X, Y, Z) and connect U (phase 1), V (phase2), W (phase3) and delta join (U, Z) phase 1, join (V,X) phase 2, join (W,Y) phase 3. Phase 2 is similar to phase 1, V head start - Y end head. The first head nest start letter U - (end nest) (one pole north) join end - X terminal (one pole south) phase 1 north pole and south pole 180° elec grade. In normative DIN use for terminal leads the letters U, V, W signify the coil head, and letters X, Y, Z signify coil end.įor example, a two pole three phase motor has 6 nests, 3 coils per nest, and 6 leads. In normative for manufacture electrical motors there exist two standards: DIN convention (Europe) and NEMA (American countries).
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