Operating Instructions

ManualsBrandsSiemens ManualsVariable Speed DriveEU-Declaration of Conformity, SINAMICS G120

List of parameters

Parameters

1-83

SINAMICS G120 CU230P-2 Control Units List Manual (LH9), 01/2013

p0621 = 2:

Identification of the stator resistance every time the drive is powered up (pulse enable).

If a reference value for the stator resistance at an ambient temperature is entered into p0629, then the setting value

for the stator temperature is generated from this value and not from p0350.

When activating the measurement (p0621 = 1, 2), p0629 is determined when first starting the drive. p0629 should

be saved for subsequent use. In order that p0629 matches the ambient temperature (p0625), the function should be

activated with the motor in the cold condition.

Value: 0: No Rs identification

1: Rs identification after switching-on again

2: Rs identification after switching-on each time

Dependency: - perform motor data identification (see p1910) with cold motor.

- enter ambient temperature at time of motor data identification in p0625.

- Reference stator resistance p0629 saved after it has been determined.

Refer to: p0622, r0623, p0629

Notice: The calculated stator temperature can only be compared with the measured value of a temperature sensor (KTY) to

a certain extent, as the sensor is usually the warmest point of the stator winding, whereas the measured value of

identification reflects the mean value of the stator winding. The accuracy depends very heavily on how precisely the

motor feeder cable resistance is known (see p0352).

The accuracy of the measurement can be improved by entering the feeder cable resistance p0352 and by deter-

mining the reference stator resistance p0629 for the ambient temperature. p0629 is the measured value r0623,

which was determined immediately after the first commissioning with the motor in a cold state. For p0621 = 1,

p0629 is also measured when switching on for the first time and not after the Control Unit has powered up.

Note: The measurement is carried out:

- For induction motors

- When vector control is active (see p1300)

- If a temperature sensor (KTY) has not been connected

- When the motor is at a standstill when switched on

When a flying restart is performed on a rotating motor, the temperatures of the thermal motor model are set to a

third of the overtemperatures. This occurs only once, however, when the CU is booted (e.g. after a power failure).

If identification is activated, the magnetizing time is determined via p0622 and not via p0346. Quick magnetizing

(p1401.6) is de-energized internally and alarm A07416 is displayed. The speed is enabled after completion of the

measurement.

Description: Sets the excitation time of the motor for the stator resistance identification after powering up again (restart).

Dependency: Refer to: p0621, r0623

Note: For p0622 < p0346 the following applies:

If identification is activated, the magnetizing time is influenced by p0622. The speed is enabled after measurement

is complete, but not before the time in p0346 has elapsed (see r0056 bit 4). The time taken for measurement also

depends on the settling time of the measured current.

For p0622 >= p0346 the following applies:

Parameter p0622 is internally limited to the magnetizing time p0346, so that p0346 represents the maximum possi-

ble magnetizing time during identification. The entire measurement period (magnetizing plus measurement settling

time plus measuring time) will always be greater than p0346.

p0622[0...n] Motor excitation time for Rs_ident after powering up again / t_excit Rs_id

Access level: 3 Calculated: p0340 = 1,3 Data type: FloatingPoint32

Can be changed: C(3), U, T Scaling: - Dyn. index: MDS, p0130

Units group: - Unit selection: - Func. diagram: -

Min Max Factory setting

0.000 [s] 20.000 [s] 0.000 [s]