Chapter 4 Explanation of Functions
4 - 90
*3 Convert the moment of inertia (J) into the motor shaft data. When the value of J is large, the motor
response is fast, and the motor torque increases quickly. When the value of J is small, the motor
response is slow, and the motor torque increases slowly. To control the response, set the value of J,
and then adjust the speed response (H005/H205).
*4 In the modes of sensorless vector control, 0Hz-range sensorless vector control and vector control with
sensor, inverter may output reverse to given operation command in the low speed range as a nature of
those control. In case there is a specific inconvenience for example reverse rotation damage the
machine, enable the reverse run protection (b046). (see 4.2.101: Reverse run protection function)
Arbitrary setting of motor constants
For the arbitrary setting of the motor constants, the function codes requiring settings vary depending on
the settings of the 1st/2nd control function and the motor constant selection.
- When the 1st/2nd control function is enabled and "00" is specified for the motor constant selection →
Directly input the desired values for "H020" to "H024".
- When the 1st/2nd control function is enabled and "01" or "02" is specified for the motor constant
selection → Directly input the desired values for "H030" to "H034".
When the offline auto-tuning has not been performed, the constants (Hitachi general-purpose motor
constants) of the motors in the same capacity class as the inverter have been set for "H030/H230" to
"H034/H234".
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