Chapter 12 Description of Parameter SettingsC2000-HS
12.2-00-9
When Pr.11-01 = 256, it is 1PU. So if you use a 22kW motor, the motor inertia is 14.2 kg-cm
2
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
2
):
Rated power
Inertia
Rated power
Inertia
Rated power
Inertia
[HP] [kW]
[HP] [kW]
HP kW
30 22 17.6
150 112 190.0
475 354 964.3
40 30 20.2
175 130 215.0
535 399 1073.4
50 37 35.5
215 160 280.0
60 45 41.0
250 186 355.0
75 56 49.4
300 224 513.9
100 75 105.6
375 279 598.1
120 89 127.5
420 313 705.3
The base value for PM system inertia is set by Pr.05-38 and the unit is in kg-cm
2
.
ASR1 / ASR2 Switch Frequency
Default: 7.0
Settings 5.0–1500.0Hz
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
Default: 10
Settings 1–40Hz (IM) / 1–100Hz (PM)
ASR2 High-speed Bandwidth
Default: 10
Settings 1–40Hz (IM) / 1–100Hz (PM)
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