Siemens ET 757 E Series Instruções de Operação descarregar pdf (Página 89)

Commissioning and optimization (software)

7.2 Commissioning and optimization of the frequency converter and motor combination

ET 200pro FC

Operating Instructions, 11/2007, A5E01100763B AA

The motor data identification routine operates with the results of the "Complete

parameterization" P0340 = 1 or the motor equivalent diagram data which was last saved.

The results become increasingly better the more times that the identification routine is

executed (up to 3 times).

WARNING

It is not permissible to carry-out the motor identification routine for loads which are

potentially hazardous (e.g. suspended loads for crane applications). Before starting the

motor data identification routine, the potentially hazardous load must be secured (e.g. by

lowering the load to the floor or clamping the load using the motor holding brake).

When starting the motor data identification routine, the rotor can move into a preferred

position. This is more significant for larger motors.

Note

The equivalent circuit data (P0350, P0354, P0356, P0358, P0360) and the motor cable

resistance (P0352) are entered as phase values.

During the motor identification routine, the sum of the stator resistance (P0350) and the

motor cable resistance (P0352) are determined. To get a correct stator resistance the cable

resistance has to be set before the motor identification has been started.

If the motor cable resistance is known, it should be entered into parameter P0352 before the

motor data identification. The value of P0350 then will be changed in dependenccy of P0352

and is more precisely as the calculated value.

It is not necessary to lock the motor rotor for the motor data identification routine. However, if

it is possible to lock the motor rotor during the identification routine (i.e. by closing the motor

holding brake), then this should be used to determine the equivalent circuit diagram data.

The following formula can be applied to check the correctness of the motor rating plate data:

= √3 ∗ V

NΥ

∗ I

NΥ

∗ cosϕ ∗ η ≈ √3 ∗ V

NΔ

∗ I

NΔ

∗ cosϕ ∗ η

Where:

rated motor power

N Υ

, V

N Δ

rated motor voltage (star/delta)

N Υ

, I

N Δ

rated motor current (star/delta)

cosϕ power factor

η efficiency

Before starting the motor identification, the correct ambient temp value should be entered in

P0625 (default 20°C).

If Problems occur during the identification run, for example, the current controller oscillates,

then the rating plate data should be re-checked and an approximately correct magnetizing

current P0320 entered. The motor data identification routine should then be re-started by

calling P1900 = 2 or P1900 = 3.

A step-by-step description is given in section "Quick Commissioning".

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