Motor data identification, Magnetizing current

6 Commissioning

Issue 10/06

6.2Motor data identification

START

P0625 = ?

Motor temp. - P0625

≤5 °C ?

yes no

Allow the motor

to cool down

P1910 = 1

A0541

OFF1

P1910 = 3

A0541

OFF1

END

Factory setting

Ambient motor temperature (entered in °C)

20 °C

The motor ambient temperature is entered at the instant that motor data is being determined (factory setting: 20 °C).

The difference between the motor temperature and the motor ambient temperature P0625 must lie in the tolerance range of approx. ± 5 °C. If this is not the case, then the motor data identification routine can only be carried-out after the motor has cooled down.

Select motor data identification with P1910 = 1

p1910 = 1: Identifies the motor parameter with parameter change. These are accepted and applied to the controller.

When p1910 = 1 is selected, Alarm A0541 (motor data identification active) is output, and internally p0340 is set to 3.

Starts the motor data identification run with p1910 = 1

The measuring operation is initiated with the continuous (steady-state) ON command. The motor aligns itself and current flows through it. Diagnostics is possible using r0069 (CO: Phase current).

After the motor data identification routine has been completed, p1910 is reset (p1910 = 0, motor data identification routine inhibited) and Alarm A0541 is cleared (deleted).

In order to set the frequency converter into a defined state, an OFF1 command must be issued before the next step.

Select motor data identification with P1910 = 3

p1910 = 3: Identifies the saturation characteristic with parameter change.

When p1910 = 3 is selected, Alarm A0541 (motor data identification active) is output and internally, p0340 is set to 2.

Starts the motor data identification run with P1910 = 3

The measuring operation must be started with a continuous ON command. After the motor identification routine has been completed, p1910 is reset (p1910 = 0, motor data identification routine inhibited) and Alarm A0541 is cleared (deleted).

In order to set the frequency converter into a defined state, an OFF1 command must be issued before the next step.

6.3Magnetizing current

¾The value of the magnetizing current r0331/P0320 has a significant influence on the closed-loop control. This cannot be measured at standstill. This means that the value is estimated for standard 4-pole 1LA7 Siemens standard using the automatic parameterization P0340=1 (P0320=0; result in r0331).

¾If the deviation of the magnetizing current is too high, then the values for the magnetizing reactance and those of the rotor resistance will not be able to be accurately determined.

¾Especially for third-party motors it is important that the magnetizing current that is determined, is carefully checked and if required, appropriately corrected.

32	MICROMASTER 440
	Operating Instructions (Compact)