Specifications

Chapter 6: Programming Features
Firmware – S2011 and S3012
Revision: 1 (9/98) 59 © Saftronics, Inc.
6.9 Energy Saving Control
To enable Energy Saving Control, set energy saving selection (n095) to 1.
Setting Description
0 Energy saving is disabled
1 Energy saving is enabled
Since the constants used in the Energy Saving Control mode have been preset at the factory to the optimum values prior to
shipment, it is not necessary to adjust them under normal operation. If your motor characteristics differ greatly from those of
Saftronics standard motors, refer to the following description to change the constants.
6.9.1. Energy Saving Control Mode
§ Energy Saving Gain K2 (n096)
Use this energy saving gain when running in the Energy Saving Control mode to calculate the voltage at which motor
efficiency will be greatest, and set it as the output voltage reference. This value is preset at the factory to the
Saftronics standard motor value prior to shipment. As the energy saving gain increases, output voltage increases
also.
§ Energy Saving Voltage Lower Limit (n097, n098)
Sets the output voltage lower limit. If the voltage reference value calculated in the Energy Saving Control mode is
smaller than the specified lower limit, this lower limit value is output as the voltage reference value. The lower limit
value is set in order to prevent stalling at light loads. Set voltage limits at 6Hz and 60Hz; a value obtained by linear
interpolation should be set to any limit values other than at 6Hz or 60Hz. Setting is made as a percentage of motor
rated voltage.
∗ For 400 V class, the value is twice that of 200 V class.
Figure 50 Energy Saving Voltage Lower Limit
6.9.2. Energy Saving Tuning
In the Energy Saving Control mode, the optimum voltage is calculated according to load power, and the voltage is
supplied to the load. However, the set constant may vary due to temperature variations or using other manufacturers’
motors, therefore, the optimum voltage may not be supplied in some cases. Automatic tuning controls voltage so that
highly efficient operation is maintained.
§ Voltage Limit of Tuning (n100)
Limits the range to control voltage by tuning. Setting is made in a percentage of motor rated voltage. By setting this
value to 0, turning is disabled.
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