Yaskawa VS-626 MC5 - Manual (Page 122)

6.2 Open-loop Vector Control
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J 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).
D No-load voltage at base speed
D Rated current at base speed
D No-load frequency at base speed
D Base speed(r/min)
D Number of poles
D No-load frequency at max. speed
D No-load voltage at max. speed
D Rated voltage (with 100% load)
D Leakage inductance (L = L1 + L2)
Refer to Fig. 6.8 for details.
L1 R1 R2/s L2
Rm
Lm
R1 Primary resistance
R2 Secondary resistance
S Slip
Rm Iron loss resistance
Lm
excitation inductance
Fig
6.8 Motor equivalent circuit (One phase, Example of Y-winding)
J Constant setting prior to autotuning
Following constants must be set before performing autotuning.
D Motor leak inductance (E2-06)
Set motor leak inductance using the following formula.
Setting by the motor leak inductance L (= L1 + L2)
( E2 – 06 )
3
¯
2 Q Rated frequency at base speed ( Hz ) L ( H ) Rated current at base speed ( A )
No–load voltage at base speed( V )
100 ( % )
Note:Refer to Fig. 6.8 for details of leakage inductance “ L”.
Setting by the lock test values
(E2–06)
3
¯ (Vs
2 3Is 2 ) (Ps3Is 2 ) 2
¯
Rated current at base speed (A)
No–load voltage at base speed (V)
100(%)
Vs Lock test voltage V
Is
Lock test current A
Ps Lock test loss W
The result of the above formula should be from 5 to 25%. Verify the data when the obtained results are
too large (or small).
D Carrier frequency
Set carrier frequency to 5.0 kHz.
Carrier frequency during autotuning: C8-30=1 (Carrier frequency is set to a value as set in C6-01)
Carrier frequency upper limit: C6-01=5.0 kHz
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