6-98
Energy-saving
When the Energy Saving Function is activated the output voltage is automatically lowered to run the motor at
maximum efficiency.
Related Parameters
Adjusting Energy-saving Control
• To enable the energy saving function, set b8-01 (Energy Saving Mode Selection) to 1. The default setting
is 0 (disabled).
• b8-04 (Energy-saving Coefficient) is preset assuming that motor and inverter capacity are the same. Adjust
b8-04 in steps of 5 % until the output power reaches its minimum. The higher the energy-saving coeffi-
cient, the higher is the output voltage.
• To improve the responsiveness when the load fluctuates reduce the power detection filter time constant b8-
05. If b8-05 is set too small the motor rotations may become unstable under light load conditions.
• Motor efficiency varies due to temperature fluctuations and differences in motor characteristics. Conse-
quently the motor efficiency has to be controlled. To have optimized efficiency, the search operation varies
the output voltage. Parameter b8-06 (Search Operation Voltage Limiter) limits the range for the voltage
search operation. For 200 V Class Inverters, a range of 100% is equal to 200 V and for 400 V Class Invert-
ers a range of 100% is equal to 400 V. Set to 0 to disable the search operation voltage limiter.
Parameter
Number
Name
Setting
Range
Factory
Setting
Change
During
Operation
Access
Level
b8-01 Energy-saving mode selection 0 or 1 0 No A
b8-04 Energy-saving coefficient
0.0 to
655.00
*1
*1. The factory setting depends on the Inverter capacity
No A
b8-05 Power detection filter time constant 0 to 2000 20 msec No A
b8-06 Search operation voltage limiter 0 to 100 0% No A
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