Chapter 6. Operation Mode and How to use
6-
2
Inertia ratio setting Inertia ratio setting
Unknown 0 15-100 5
1-3 1 25-200 6
2-10 2 100-300 7
3-15 3 200-400 8
10-25 4 300-500 9
* Inertia ratio = (inertia of motor + load inertia)/motor inertia
ÆIf autotuning (P2-23) is ON and practice five times deceleration and acceleration operation inertia
value is saved to P2-21.
ÆIf the value of inertia ratio is set make the autotuning OFF
b) How to gain tuning
Æ Incase of knowing the inertia ratio, Input the inertia ratio passively.
Æ Tune the below value according to the inertia ratio.
Inertia ratio Setting
SC I TC (P2-03) PC P Gain (P2-01)
60,80 130
SC LOOP
Gain (P2-02)
1 500 20 6 50 125
2 350 30 9 35 85
3 290 35 11 29 70
5 1 220 45 14 22 55
10 2 160 60 19 16 40
20 3 110 90 27 11 27
50 5 70 140 42 7 18
100 10 50 200 60 5 13
20 30 300 100 3 8
Æ If the SC Loop gain is too low, vibration occurs and response becomes fast if it is high, but
vibration occurs if the gain is excessively high. Response becomes fast if SC I TC is reduced, but
overshoot occurs if it is reduced excessively. Position reaching time is shortened if the PC P Gain is
increased; however, excessive gain may cause vibration and overshoot.
Æ In case that happens noise by vibration in motor, tune FDELAY (P3-15). If FDELAY increase,
noise is lessen, but it is stable that is used within SC I TC value.
Æ If motor is unstable in above course, inquire technique department. That records parameter
tuned is helpful.
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