Abb The Motor Guide Gb

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54. 69 4. 8 Connection diagrams Connection of three phase, single speed motors ∆-connection Y connection Connection of two-speed motors Two-speed motors are normally connected as illustrated below; direction of rotation as given on page 35. Motors of normal design have six terminals and one earth terminal in the terminal box. Motors with two separate windings are normally ∆ -∆ connected. They can also be Y/Y, Y/ ∆ or ∆ /Y connected. Motors with one winding, Dahlander-connection, are connected ∆ /YY when designed for constant torque drives.

Efficiency, power factor and speed remain approximately the same. Guaranteed values available on request. Motor wound for Connected to (50 Hz) 230 V 220 V 400 V 230 V 500 V 690 V 380 V 415 V 500 V 550 V 660 V 690 V % of values at 400 V, 50 Hz Output 100 100 100 100 100 100 100 100 IN 182 174 105 98 80 75 61 58 IS/IN 90 100 90 106 100 119 90 100 TS/TN 90 100 90 106 100 119 90 100 Tmax/TN 90 100 90 106 100 119 90 100 41 3. 6 Tolerances Efficiency by summation losses Efficiency by inputoutput test Power factor Locked rotor current Locked rotor torque Pull-up torque PN (kW) 50 -15% (1- ) -15% (1- ) -1/6 (1-cos ) +20% -15% +25% -15% PN (kW) >50 -10 % (1- ) -15% (1-) -1/6 (1-cos ) + 20% -15% +25% -15% Moment of Inertia Noise level PN (kW) 50 ±10% +3 dB(A) PN (kW) >50 ±10% +3 dB(A) PN (kW) <1 ±30% PN (kW) 1 ±20% Slip Tolerances are in accordance with IEC 34-1 and based on test procedure in accordance with IEC 34-2.

7 Power factor A motor consumes both active power, which it converts into mechanical work, and also reactive power, which is needed for magnetization but does not perform any work. The active and reactive power, represented in the diagram (below) by P and Q, together give the apparent power S. The ratio between the active power, measured in kW, and the apparent power, measured in kVA, is known as the power factor. The angle between P and S is usually designated ϕ. The power factor is equal to cosϕ.

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