Energy Saving Control - YASKAWA V7 Technical Manual

5.31 ENERGY SAVING CONTROL

n139: Energy Saving Selection
(V/f control mode)
To enable energy saving control, n139 must be set to "1"
Since the parameters used in energy saving mode have been preset to the optimum values, it is not
necessary to adjust them under normal operation. If the motor characteristics differ greatly from
those of a standard motor, refer to the following description to change the parameters.
A. Energy Saving Control Mode
n140: Energy Saving Gain
This gain is used when running in energy saving control mode to calculate the voltage at which
motor efficiency will be greatest, and is set as the output voltage reference. This value is preset to a
typical standard motor value. As energy saving increases, output voltage also increases.
n141: Energy Saving Voltage Lower Limit (60 Hz)
n142: Energy Saving Voltage Lower Limit (6 Hz)
n159: Energy Saving Voltage Upper Limit (60 Hz)
n160: Energy Saving Voltage Upper Limit (6 Hz)
These parameters are used to set the output voltage upper and lower limits. If the voltage reference
value calculated in the energy saving is below the lower limit or above the upper limit, the lower or
upper limit value is used as the voltage reference value. The lower limit value is set to prevent
stalling at light loads, and the upper limit is set to prevent over-excitation. Set voltage limits at 6Hz
and 60Hz; a value obtained by linear interpolation should be set to any limit values other than 6Hz
or 60Hz. Setting is made as a percentage of motor rated voltage.
*Doubled for 460V Drives
Factory Setting: 0
Range: 0 or 1
Factory Setting: See Table A3-1
Range: 0.0 to 6550
Factory Setting: 50%
Range: 0 to 120%
Factory Setting: 12%
Range: 0 to 25%
Factory Setting: 120%
Range: 0 to 120%
Factory Setting: 16%
Range: 0 to 25%
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