YASKAWA V7 Technical Manual

Also see for SI-T/ V7: Instructions

Contents

5-53n139: 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 notnecessary to adjust them under normal operation. If the motor characteristics differ greatly fromthose of a standard motor, refer to the following description to change the parameters.A. Energy Saving Control Moden140: Energy Saving GainThis gain is used when running in energy saving control mode to calculate the voltage at whichmotor efficiency will be greatest, and is set as the output voltage reference. This value is preset to atypical 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 referencevalue calculated in the energy saving is below the lower limit or above the upper limit, the lower orupper limit value is used as the voltage reference value. The lower limit value is set to preventstalling at light loads, and the upper limit is set to prevent over-excitation. Set voltage limits at 6Hzand 60Hz; a value obtained by linear interpolation should be set to any limit values other than 6Hzor 60Hz. Setting is made as a percentage of motor rated voltage.Factory Setting: 16%Range: 0 to 25%Factory Setting: 120%Range: 0 to 120%Factory Setting: 12%Range: 0 to 25%Factory Setting: 50%Range: 0 to 120%Factory Setting: See Table A3-1Range: 0.0 to 6550Factory Setting: 0Range: 0 or 1*Doubled for 460V Drives5.31 ENERGY SAVING CONTROL