Energy-Saving - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

Energy-saving

To perform energy saving, set b8-01 (Energy Saving Mode Selection) to 1.
Related Constants
Con-
stant Name
Number
b8-01 Energy-saving mode selection
b8-04 Energy-saving coefficient
Power detection filter time con-
b8-05
stant
b8-06 Search operation voltage limiter
* 1. The same capacity as the Inverter will be set by initializing the constants.
* 2. The factory settings depend on the Inverter capacity.
Adjusting Energy-saving Control
When the Energy Saving Function is activated the voltage for optimum motor efficiency is calculated and
becomes the output voltage reference.
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, however, the motor rotations may become unstable under light load condi-
tions.
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 var-
ies the output voltage. Constant 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.
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Details
Select whether to enable or disable energy-saving control.
0: Disable
1: Enable
Sets the Energy-saving coefficient.
Adjusts the value in 5% steps until the output power
becomes minimal.
Sets the time constant for output power detection.
Sets the limit value of the voltage control range during
search operation.
Set to 0 to disable the search operation. 100% is the motor
rated voltage.
Individual Functions
Change
Setting Factory Access
During
Range Setting Level
Opera-
tion
0 or 1 0 No A
0.0 to
*2 No A
*1
655.00
0 to 2000 20 ms No A
0 to 100 0% No A
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