MICROMASTER 4 (MM4): determine the stator resistance (p0350)
How is stator resistance (p0350) set?
The three methods for setting the stator resistance value are as follows:
- Calculate the stator resistance value using P0340 = 1 or P3900 = 1 or 2. The stator resistance is automatically calculated from the motor information in "Quick Commissioning Mode" (P0010 = 1) by entering P3900 = 1 or 2 (P3900 = 1 Performs calculations and includes factory reset of parameters not in Quick Commissioning group / P3900 = 2 Performs calculations only).
The value is then stored in P0350.
Alternatively, once the data from the motor rating plate has all been entered correctly, setting P0340 = 1 also performs the motor parameter calculations and the stator resistance will be stored in P0350.
- Measure the stator resistance manually using an Ohmmeter and enter the result in P0350.
- Measure the stator resistance internally using P1910.
- P1910 = 0: no measurement is calculated - the value in P0350 will be used.
- P1910 = 1: stator resistance measurement - overwrites previous value of P0350.
- P1910 = 2: stator resistance measurement - does NOT overwrite P0350 - the previous value will still be used.
After the measurement is complete, the warning should disappear, but to get the inverter to run you need to remove the ON command and then reapply it.
The measured stator resistance value can be read in parameter r1912, (and also in P0350 if you select P1910 = 1 to overwrite the previous value in P0350). This value can be used for comparison purposes if you don't have an Ohmmeter.
|Calculation of motor parameters||P0340||Calculates various motor parameters.to optimize inverter performance.||1||Complete parameterization|
|Stator resistance||P0350||Stator resistance value in [Ohms] for connected motor.
MM4: parameter value includes the cable resistance
G120: parameter value doesn't include the cable resistance
|Select motor data identification||P1910||Performs a motor data identification||0||disabled|
|1||Identification of all parameters with parameter change|
|2||Identification of all parameters without parameter change|
|Identified stator resistance||r1912||Displays measured resistance value (G120: This value also includes the cable resistances)|
|End of quick commissioning||P3900||Performs calculations necessary for optimized motor operation||1||End quick commissioning with factory reset|
|2||End quick commissioning|
|Motor data identification routine active||A0541||motor data identification routine (P1910) selected and is active|
The stator resistance value required is stored in parameter P0350.
This FAQ applies only to the SINAMICS G120/G120D Control Units without “-2” in the product name and MICROMASTER 4 inverters.
FAQ: MICROMASTER 4 (MM4): Optimization of the standard motor identification routine (MOT-ID) for VC and SLVC 37690358
Application example: MICROMASTER 440: manually determining the magnetizing current and re-calculating the motor equivalent circuit diagram 22078991