4-36
4-2 Function Mode
4
Functions
Automatic Energy-saving Operation Function
•This function automatically minimizes the Inverter output power during constant speed operation,
and is suitable for load with reduced torque characteristics (e.g. fan, pump).
•To operate with this function, set RUN mode selection A085 to "01".
You can adjust the response and accuracy with energy-saving response/accuracy adjustment
A086.
•Controls the output power at a comparatively slow rate. Should rapid load fluctuation like impact
load occur, the motor may stall, resulting in an overcurrent trip.
Automatic Optimum Acceleration/Deceleration
•The automatic acceleration/deceleration function eliminates the need for acceleration/deceleration
settings during Inverter operation.
•Conventionally, the user had to set an Inverter acceleration/deceleration time depending on the
actual load conditions. However, this function can automatically set an acceleration/deceleration
time, making full use of the Inverter's capacity.
The acceleration time is a time during which acceleration is performed within a current value set in
the overload limit parameter (when the overload limit function is enabled), or within approx. 150%
of the rated current (when the overload limit function is disabled). The deceleration time is a time
during which deceleration is performed within approx. 150% of the rated current value, or within a
DC voltage in the Inverter circuit of approx. 370 V (200V-class) or approx. 740 V (400 V-class).
Thus, the Inverter enables real-time response to a change in applied load and inertia, and sets
acceleration/deceleration time automatically.
• Note the following before use:
Note 1: This function is not suitable for a machine that needs a fixed acceleration/deceleration time.
Acceleration/deceleration time varies depending on applied load and inertia.
Note 2: If the machine inertia exceeds approx. 20 times that of the motor shaft, the Inverter may trip.
In this case, reduce the carrier frequency.
Note 3: Acceleration/deceleration time varies depending on fluctuations in current value, even with
the same motor.
Note 4: The automatic optimum acceleration/deceleration setting is enabled only during V/f control.
When sensorless vector control is selected, the Inverter performs normal operation.
Parameter No. Function name Data Default setting Unit
A085 RUN mode selection
00: Normal operation
01: Energy-saving operation
02: Automatic operation
00
A086
Energy-saving response/
accuracy adjustment
0.0 to 100.0 50.0 %
Parameter No. Function name Data Response Accuracy
A086
Energy-saving response/
accuracy adjustment
0.0
100.0
Slow
Fast
High
Low
Parameter No. Function name Data Default setting Unit
A085 RUN mode selection
00: Normal operation
01: Energy-saving operation
02: Automatic operation
00
Related functions A044, A244, A344, b021, b024, b022, b025
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