Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-11-4
Perform the operation test with load based on the inertia after tuning. Run the motor in
acceleration, deceleration, and steady speed and observe the values. If values between speed
feedback and speed command are close, steady-state error is small and overshoot is less, then
this inertia is a better one.
If the Iq current command from ASR has high-frequency glitch, then decrease the setting. If the
response time of sudden loading is too slow, then increase the setting.
When using torque mode as the control mode, perform the tuning with speed mode first to see
if the tuned inertia can work normally. After verifying with speed mode, change the control mode
to torque mode.
The base values of induction motor system inertia are listed below: (Unit: kg-cm
2
)
HP kW Base value HP kW Base value HP kW Base value
1 0.75 2.3 40 30 202.5 300 220 5139.0
2 1.5 4.3 50 37 355.5 340 250 5981.0
3 2.2 8.3 60 45 410.8 375 280 5981.0
5 3.7 14.8 75 55 494.8 425 315 5981.0
5 4.0 26.0 100 75 1056.5 475 355 5981.0
7 5.5 26.0 125 90 1275.3 530 400 5981.0
10 7.5 35.8 150 110 1900.0 600 450 5981.0
15 11 74.3 175 132 2150.0 675 500 5981.0
20 15 95.3 215 160 2800.0 750 560 5981.0
25 18.5 142.8 250 185 3550.0
30 22 176.5 270 200 5139.0
The base value of synchronous motor system inertia is set by Pr.05-38 and the unit is in kg-cm
2
.
11-02
ASR1 / ASR2 Switch Frequency
Default: 7.00
Settings 5.00–599.00 Hz
Set the low-speed and high-speed ASR switching point in the FOC area. Provides flexibility to
meet two needs: give a high response in the high-speed region of the estimator switch point,
and give a lower response in the low-speed region of the estimator switch point. The
recommended switching point is higher than Pr.10-39.
A low setting does not cover Pr.10-39. If the setting is too high, the high-speed range is too
narrow.
If Pr.00-11 = 8 (SynRM sensorless), then the default becomes 10.00 Hz.
11-03
ASR1 Low-speed Bandwidth
11-04
ASR2 High-speed Bandwidth
11-05
Zero-speed Bandwidth
Default: 10
Settings 1–[(Pr.00-17 carrier frequency) ÷ 40] Hz
After estimating inertia and setting Pr.11-00 bit0 = 1 (auto-tuning), you can adjust Pr.11-03, Pr.11-
04 and Pr.11-05 separately by speed response. The larger the setting value, the faster the
response. Pr.11-02 is the switch frequency between the low-speed / high-speed bandwidth.
If Pr.00-11 = 8 (SynRM sensorless), then the upper limit value becomes 30, and the default
becomes 5.
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