Chapter 12 Description of Parameter Settings
MH300
Per Unit of System Inertia
Default: 256
Settings 1–65535 (256 = 1 PU)
To get the system inertia per unit from Pr.11-01, you need to set Pr.11-00 to bit1 = 1 and execute
continuous forward/reverse running.
When Pr.11-01 = 256, it is 1PU. So if you use a 2 HP motor, the 2HP motor inertia is 4.3 kg-cm
2
according to the table below. If Pr.11-01 = 10000 after tuning, the system inertia is (10000 / 256)
x 4.3 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.
Unit of induction motor system inertia is kg-cm
2
:
Power Setting
Power Setting
ASR1 / ASR2 Switch Frequency
Default: 7.00
Settings 5.00–599.00 Hz
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, high-speed range is too narrow.
Default: 10
Settings 1–40 Hz (IM) / 1–100 Hz (PM)
ASR2 High-speed Bandwidth
Default: 10
Settings 1–40 Hz (IM) / 1–100 Hz (PM)
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