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When Pr.11-01 = 256, it is 1PU. So if you use a 22kW motor, the motor inertia is 14.2 kg-cm
according to the table below. If Pr.11-01 = 10000 after tuning, the system inertia is (10000 / 256)
x 14.2 kg-cm
2
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.
Induction motor system inertia (unit: kg-cm
Rated power
[HP]
[kW]
30
22
40
30
50
37
60
45
75
56
100
75
120
89
The base value for PM system inertia is set by Pr.05-38 and the unit is in kg-cm
ASR1 / ASR2 Switch Frequency
Settings
The upper limit is the same as the maximum operation frequency for Pr.01-00.
Sets the low-speed and high-speed ASR switching point in the FOC area. Provides flexibility to
meet two needs: in the high-speed region of the estimator switch point it has a high response,
and in the low-speed region of the estimator switch point it has a lower response. 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.
ASR1 Low-speed Bandwidth
Settings
ASR2 High-speed Bandwidth
Settings
.
Rated power
Inertia
[HP]
17.6
150
20.2
175
35.5
215
41.0
250
49.4
300
105.6
375
127.5
420
5.0–1500.0Hz
1–40Hz (IM) / 1–100Hz (PM)
1–40Hz (IM) / 1–100Hz (PM)
12.2-00-9
Chapter 12 Description of Parameter SettingsC2000-HS
2
):
Inertia
[kW]
112
190.0
130
215.0
160
280.0
186
355.0
224
513.9
279
598.1
313
705.3
Rated power
Inertia
HP
kW
475
354
964.3
535
399
1073.4
.
2
Default: 7.0
Default: 10
Default: 10
2
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