Caution – Yaskawa VS-626 MC5 User Manual

Page 132

6.3

Flux Vector Control

- 29

6.3.4 Autotuning for machine tool spindle motors

CAUTION

Do not connect a load to the motor when performing autotuning.

Doing so may result in personal injury or equipment damage.

Precautions before Autotuning

The VS-626MC5’s autotuning function automatically determines the motor constants while a servo
system’s autotuning function determines the size of a load, so these autotuning functions are funda-
mentally different.

If a load is connected when autotuning is performed, not only will incorrect motor constants be re-
corded, but the motor may operate erratically or unexpectedly. Please disconnect load before perform-
ing autotuning.

The motor shaft will rotate when autotuning is performed. Confirm safety before starting autotuning.

For winding change motors, conduct autotuning of motor 1 and 2.

Acquisition of Motor Data

When autotuning motors for machine tool spindles, it is necessary to check the following data for the wind-
ing motors (Y- and - windings).

Leakage inductance (L = L1 + L2)
Refer to Fig.6.11 for details.

Rated frequency at base speed (Hz)

Rated current at base speed (A)

No-load voltage at base speed (V)

No-load frequency at base speed (Hz)

Base speed (r/min)

Number of poles

No-load frequency at max. speed (Hz)

No-load voltage at max. speed (V)

R2/s

Primary resistance

Secondary resistance

Slip

Rm Iron loss resistance
Lm

Excitation inductance

Fig

6.11

Motor equivalent circuit (For one phase, Converted to Y-winding)