User Manual

SINAMICS G120 CU230P-2 Control Units
List Manual (LH9), 04/2014, A5E33838102B AA
85
2 Parameters
2.2 List of parameters
Description: Sets the thermal adaptation of the stator/primary section resistance and rotor/secondary section resistance according
to r0395 and r0396.
Value: 0: No thermal adaptation of stator and rotor resistances
1: Resistances adapted to the temperatures of the thermal model
2: Resistances adapted to the measured stator winding temperature
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
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: 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.
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.
p0620[0...n] Thermal adaptation, stator and rotor resistance / Mot therm_adapt R
Access level: 4 Calculated: p0340 = 1 Data type: Integer16
Can be changed: C(3), U, T Scaling: - Dyn. index: MDS
Units group: - Unit selection: - Func. diagram: -
Min Max Factory setting
0 2 1
p0621[0...n] Identification stator resistance after restart / Rst_ident Restart
PM230
PM240
PM250, PM260
Access level: 2 Calculated: - Data type: Integer16
Can be changed: C(3), T Scaling: - Dyn. index: MDS, p0130
Units group: - Unit selection: - Func. diagram: -
Min Max Factory setting
0 2 0