Nord-drivesystems B1091-1 User Manual download pdf (Page 10)

Motors in fi operation for Category 3D – Planning guideline for B 1091

10 B 1091-1 GB-3213

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1.5 Assignment of the frequency inverter and selection of the operating mode

The rated current of the frequency inverter must match the rated current of the motor in order to

achieve an adequate accuracy of the current measurement. The rated current of the frequency

inverter must not exceed 2x the rated motor current.

According to this planning guideline, multiple-motor operation is not permitted, as selective i²*t

monitoring of a motor is then no longer possible.

Please note the technical data in section 2

According to the application, the operating mode of the motor can be selected from one of the

following 3 characteristic curves:

•

50 Hz characteristic

curve:

Nominal point 400 V / 50 Hz, 0 – 50 Hz no field weakening and

50 – 100 Hz field weakening.

•

87 Hz characteristic

curve:

Nominal point 400 V / 87 Hz, 0 – 87 Hz no field weakening and

87 – 100 Hz field weakening.

•

100 Hz characteristic

curve:

Nominal point 400 V / 100 Hz, 0 – 100 Hz reduced constant torque with slight field

weakening.

V/f characteristic curves

Figure 1: Selection of V/f characteristic curves

Legend

50 Hz characteristic curve

87 Hz characteristic curve

100 Hz characteristic curve

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Nord-drivesystems B1091-1 User Manual Page 10

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