Attentions; About Auto Energy Saving Function; Actions Of Auto Energy Saving Mode - Sanken SVCO6 Instruction Manual

7-3 Description of Functions

4) Attentions

Simple energy saving function only decreases the output voltage of the inverter. Therefore, since the load

conditions are different, the voltage drop may result in the slow down of the speed. In devices with low speed
forbidden, the energy saving and rotating speed should be compensated by the combination of auto energy
saving mode (speed control) and PID control.
For loads without energy saving even when the output voltage is decreased, never use this method.

When restarting by the functions of flying start, alarm auto resetting, instantaneous stop restarting and etc., the

simple energy saving function should be started from the beginning. (flying start can be added)
Since the stopping action in simple energy saving is used for deceleration after the output voltage is recovered

to the original value, the actual stopping time will change according to the recovering time of the voltage.
When time sequence control is adopted, please take consideration of this recovery time.
Operation
command
Simple energy-saving time

(2) About auto energy saving function

The auto energy saving function is based on the V/f control method and speed control method.
Please make a selection with a motor control mode of F1001.
① F1001=1 (V/f mode)
● Based on V/f mode, the energy saving function is realized by supplying high-frequency voltage to the torque
required by the load.
● Different from the simple energy saving function with manual adjusting of optimal voltage, this function can
automatically calculate the high-frequency voltage value even when the load is changed, therefore realizing a
stable energy saving.
● When energy saving, motor speed control and other feedback controls are operated synchronously, they can be
used together with PID controlling function when a sensor is installed on the system. (Please set F3002 for PID
feedback input)
1) Actions of auto energy saving mode (V/f mode)
· The auto energy saving mode can be used for the starting of inverter operation and the control of auto energy
saving mode. During energy saving, the output voltage for high-efficient operation will be calculated and the
voltage will be changed slowly.
Whereas, in case that the acceleration / deceleration time is very short, the energy saving mode will be enabled
after constant-speed operation is entered.
Normal V/f output voltage
Simple energy-saving rate
Action scope of simple energy saving
- 180 -
Output frequency
Simple energy-saving rate
F1902
Output voltage
Time