1-4 Restrictions
Selecting the PM motor mode disables the following functions.
•
2nd control
•
Torque control and torque limit functions
•
Encoder feedback function
•
Induction motor control function
•
Automatic Voltage Regulator (AVR)
•
Dual rating function (Normal/Light load mode)
•
Simple position control function, Energy-saving control, Brake control, Overcurrent suppression func-
tion, Jogging function, etc.
Therefore, unavailable parameters and the selection functions that cannot be selected in parameters,
are not displayed on the Digital Operator. In addition, for some parameters, the default data are
changed.
For details, refer to 6-8 PM Motor Mode on page 6-54.
Selecting the light load mode disables the following control.
•
Sensorless vector control
Therefore, functions associated with this control such as auto-tuning/motor parameter setting, torque
control, and torque limit functions are unavailable.
In addition, switching from the heavy load mode to the light load mode causes the Inverter rated cur-
rent and overload detection level to be changed, which also changes the default data and setting
ranges of some parameters.
For details, refer to 5-2-2 Heavy load/Light Load Selection on page 5-11.
Precautions for Correct Use
•
Derating of the rated output current of the inverter may be required depending on the nor-
mal/light load mode selection, operating ambient temperature, side-by-side installation, and
carrier frequency settings.
Use the inverter in an appropriate environment according to A-1 Derating on page A-2.
•
In the light load (VT) mode, the PM motor mode cannot be used. Switching from the light load
(VT) mode to the PM motor mode causes the rated current and overload detection settings to
be changed to those for the heavy load mode.
•
In the light load (VT) mode, the high-frequency mode cannot be used. Switching from the
light load (VT) mode to the high-frequency mode causes the rated current and overload
detection settings to be changed to those for the heavy load (CT) mode.
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