Siemens ET 757 E Series Instruções de Operação descarregar pdf (Página 88)

Commissioning and optimization (software)

7.2 Commissioning and optimization of the frequency converter and motor combination

ET 200pro FC

88 Operating Instructions, 11/2007, A5E01100763B AA

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Figure 7-1 Equivalent circuit diagram (ECD)

In addition to the ECD data, the motor magnetizing characteristic (see the figure above) can

be determined using the motor data identification (P1900 = 3). If the motor-inverter

combination is operated in the field-weakening range (which is above the nominal frequency

of the motor), then this characteristic should be determined, especially when Vector control

is being used. As a result of this magnetizing characteristic, the Inverter can, in the field-

weakening range, accurately calculate the current which is generated in the field and in-turn

achieve a higher torque accuracy.

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Figure 7-2 Magnetizing characteristic

The motor data identification is carried-out with the motor at a standstill and it takes,

including the data calculation per selection (P1900 = 2 or 3), between 20 seconds and 4

minutes to complete. While the motor data identification is active A0541 is displayed. The

identification time depends on the motor and increases with its size (this takes approx. 4 min.

for a 200 kW motor).

The motor data identification routine must be carried-out with the motor in the cold condition

so that the motor resistance values saved can be assigned to the parameter of the ambient

temperature P0625. Only then is the correct temperature adaptation of the resistances

possible during operation.

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 189 190

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Siemens ET 757 E Series Instruções de Operação Página 88

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