Siemens SINAMICS G120 List Manual page 100

2 Parameters
2.2 List of parameters
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 switched on for the first time (pulse enable) after booting
the Control Unit.
p0621 = 2:
Identification of the stator resistance every time the drive is switched on (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.
Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Refer to: p0622, r0623
Notice: The calculated stator temperature can only be compared with the measured value of a temperature sensor
(KTY/PT1000) 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/PT1000) 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 switching on again / t_excit Rs_id
Access level: 3
Can be changed: C(3), U, T
Unit group: -
Min
0.000 [s]
Description: Sets the excitation time of the motor for the stator resistance identification after switching on again (restart).
Dependency: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
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 possible
magnetizing time during identification. The entire measurement period (magnetizing plus measurement settling time
plus measuring time) will always be greater than p0346.
r0623 Rs identification stator resistance after switch on again / Rs-id Rs aft sw-on
Access level: 4
Can be changed: -
Unit group: -
Min
- [ohm]
Description: Displays the stator resistance determined using the Rs identification after switching on again.
100
No Rs identification
Rs identification after switching-on again
Rs identification after switching-on each time
Calculated: p0340 = 1,3
Scaling: -
Unit selection: -
Max
20.000 [s]
Calculated: -
Scaling: -
Unit selection: -
Max
- [ohm]
SINAMICS G120 Control Units CU240B-2/CU240E-2
Data type: FloatingPoint32
Dyn. index: MDS, p0130
Func. diagram: -
Factory setting
0.000 [s]
Data type: FloatingPoint32
Dyn. index: -
Func. diagram: -
Factory setting
- [ohm]
List Manual (LH11), 01/2016, A5E33839529