Chapter 12 Descriptions of Parameter SettingsMS300
431
11 Advanced Parameters
In this parameter group, ASR stands for Adjust Speed Regulator.
You can set this parameter during operation.
bit 0 = 0: Pr.11-06–Pr.11-11 are valid and Pr.11-03–Pr.11-05 are invalid.
bit 7 = 0: Save the frequency before power is OFF. When power is ON again, the saved
frequency is displayed.
bit 7 = 1: Do not save the frequency before power is OFF. When power is ON again, 0.00 Hz is
the displayed frequency.
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 2 HP motor inertia is 0.00043
kg-cm
2
according to the table below. If Pr.11-01 = 10000 after tuning, the system inertia is
(10000 ÷ 256) × 0.00043 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.
The following table shows the base value for the induction motor system inertia (Unit: kg-m
2
)
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