Efficient Networks Siemens Sinamics S120 User Manual

Page 97

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Servo control

3.12 Motor data identification

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

Table 3-14 Data determined using p1960 for synchronous motors (rotating measurement)

Determined data

Data that are accepted (p1960 = 1)

r1934 q inductance identified

r1935 q inductance identification current

Note:
The q inductance characteristic can be used as basis to manually determine the data for the current controller adaptation

(p0391, p0392 and p0393).
r1937 torque constant identified

p0316 motor torque constant

r1938 voltage constant identified

p0317 motor voltage constant

r1939 reluctance torque constant identified

p0328 motor reluctance torque constant

r1947 optimum load angle identified

p0327 optimum motor load angle

r1969 moment of inertia identified

p0341 motor moment of inertia

* p0342 ratio between the total moment of inertia and that of

the motor

+ p1498 load moment of inertia

r1973 encoder pulse number identified

Note:
The encoder pulse number is only determined with a very high degree of inaccuracy (p0407/p0408) and is only suitable for

making rough checks. The sign is negative if inversion is required (p0410.0).
r1984 Pole position identification angular difference

p0431 Angular commutation offset

Note:
r1984 indicates the difference of the angular commutation offset before being transferred into p0431.

For linear motors (p0300 = 4xx), p1959 is pre-set so that only the q inductance, the angular

commutation offset and the high inertia mass are measured (p1959.05 = 1 and p1959.10 =

1), as generally the travel limits do not permit longer traversing distances in one direction.

&DEOH

0RWRU

&DEOH

S>0@

0RWRU0RGXOH

˰6

˰5

Figure 3-18 Equivalent circuit diagram for induction motor and cable

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