Identification Stator Resistance After Restart / Rst_Ident Restart - Siemens SINAMICS G150 Manual

2 Parameters
2.2 List of parameters
Note: For p0620 = 1, the following applies:
The stator resistance is adapted using the temperature in r0035 and the rotor resistance together with the model
temperature in r0633.
For p0620 = 2, the following applies:
The stator resistance is adapted using the temperature in r0035. If applicable, the rotor temperature for adapting the
rotor resistance is calculated from the stator temperature (r0035) as follows:
theta_R = (r0628 + r0625) / (r0627 + r0625) * r0035
For separately-excited synchronous motors and p0620 = 1, p0620 = 2 is internally and automatically used for
calculating. There is no thermal model to adapt the damping resistances.
p0621[0...n]

Identification stator resistance after restart / Rst_ident Restart

VECTOR_G (n/M) Can be changed: C2(3), T
Data type: Integer16
P-Group: Motor
Not for motor type: PEM, REL, FEM
Min
0
Description: Selects the identification of the stator resistance after booting the Control Unit (only for vector control).
The identification is used to measure the actual stator resistance and from the ratio of the result of motor data
identification (p0350) to the matching ambient temperature (p0625) the actual mean temperature of the stator
winding is calculated. The result is used to initialize the thermal motor model.
p0621 = 1:
Identification of the stator resistance only when the drive is powered up for the first time (pulse enable) after booting
the Control Unit.
p0621 = 2:
Identification of the stator resistance every time the drive is powered up (pulse enable).
Value: 0:
1:
2:
Dependency: - perform motor data identification (see p1910) with cold motor.
- enter ambient temperature at time of motor data identification in p0625.
Refer to: p0622, r0623
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.
Furthermore this is a short-time measurement with limited accuracy that is performed during the magnetizing phase
of the induction motor.
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.
p0622[0...n] Motor excitation time for Rs_ident after powering up again / t_excit Rs_id
VECTOR_G (n/M) Can be changed: C2(3), U, T
Data type: FloatingPoint32
P-Group: Motor
Not for motor type: PEM, REL, FEM
Min
0.000 [s]
Description: Sets the excitation time of the motor for the stator resistance identification after powering up again (restart).
224
No Rs identification
Rs identification after switching-on again
Rs identification after switching-on each time
Calculated: -
Dyn. index: MDS, p0130
Units group: -
Scaling: -
Max
2
Calculated: CALC_MOD_REG
Dyn. index: MDS, p0130
Units group: -
Scaling: -
Max
20.000 [s]
List Manual (LH2), 04/2014, A5E03263479A
Access level: 2
Func. diagram: -
Unit selection: -
Expert list: 1
Factory setting
0
Access level: 3
Func. diagram: -
Unit selection: -
Expert list: 1
Factory setting
0.000 [s]
SINAMICS G130/G150