Efficient Networks S120 manual Data determined using p1910

Vector control

4.12 Motor data identification and rotating measurement

For control engineering reasons, you are strongly advised to carry out motor identification because the equivalent circuit diagram data, motor cable resistance, IGBT on-state voltage, and compensation for the IGBT lockout time can only be estimated if the data on the type plate is used. For this reason, the stator resistance for the stability of sensorless vector control or for the voltage boost in the V/f curve is very important. Motor data identification is essential if long supply cables or third-party motors are used. When motor data identification is started for the first time, the following data is determined with p1910 on the basis of the data on the type plate (rated data):

Table 4-1	Data determined using p1910
		Induction motor		Permanent-magnet synchronous motor
p1910 = 1		•	Stator resistance (p0350)	• Stator resistance (p0350)
		•	Rotor resistance (p0354)	• Stator resistance q axis (p0356)
		• Stator leakage inductance (p0356)		• Stator inductance d axis (p0357)
		• Rotor leakage inductance (p0358)		• Drive converter valve threshold voltage
		•	Magnetizing inductance (p0360)	(p1825)
		• Drive converter valve threshold voltage (p1825)		• Converter valve interlocking times (p1828 ...
		• Drive converter valve interlocking times (p1828		p1830)
			... p1830)
p1910 = 3		•	Saturation characteristics (p0362 ... p0366)	Not recommended
				Notice: When encoder adjustment is complete,
				the motor is automatically rotated approx. one
				revolution in order to determine the zero marker
				of the encoder.

Since the type plate data contains the initialization values for identification, you must ensure that it is entered correctly and consistently (taking into account the connection type (star/delta)) so that the above data can be determined.

If the resistance of the motor supply cable is known, you are advised to enter this value before the standstill measurement (p0352) so that it can be subtracted from the total measured resistance when the stator resistance (p0350) is calculated.

Entering the cable resistance improves the accuracy of thermal resistance adaptation, particularly when long supply cables are used. This governs behavior at low speeds, particularly during sensorless vector control.

140	Drive Functions
	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4