Sanken SVCO6, Instruction Manual, Page: 183 / 326

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7
7-3 Description of Functions
· Auto energy saving remains continuous operation, even when the torque is changed very slowly. Furthermore,
for the changes of frequency and quick torque alteration, the inverter will disable the energy saving operation
quickly, therefore preventing the inadequate torque caused by loaded torque alteration.
2) Attentions
· This function only controls the output voltage of the inverter. Therefore, the speed may decrease because of the
pressure rise/drop according to the load situation. When it is used on the devices with a problem when the
speed is reducing, the combination of an auto energy saving mode (speed control) and the use of PID control
system with a speed sensor can make a compensation to the energy saving and the speed. Refer to F30xx
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F33xx for PID functions.
· The time required for voltage rising to realize a high-efficient voltage value will be changed according to the
actual load condition.
· For changes of pre-set frequency, stopping command and rapid load alteration, in order to avoid the reducing
of driving power caused by inadequate loading torque, the decreased or increased output voltage will be
recovered to the original voltage within several milliseconds.
· Different from the actions in simple energy saving, the deceleration will be enabled simultaneously when the
stopping command is carried out, therefore it equals to the normal stopping time. But, when the regenerating
energy cannot be used fully, the deceleration time will be prolonged through the protective function.
· For fans and pumps, it is effective for the square torque during light loading, but it may be noneffective for the
constant torque during heavy loading.
· When restarting by the functions of flying start, alarm auto resetting, instantaneous stop restarting and etc., the
simple energy saving function should be set from the beginning. (Flying start can be added.)
· Energy saving action functions only when the loaded torque alteration is stable during constant speed running.
Therefore, when the frequencies are changed by analog frequency input and other methods, the energy can also
be saved by increasing the frequency matching range (F1508) in case the frequency is changed very slowly.
· Linear Graphic is used for the V/f figure of auto energy saving mode.
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Output frequency
Normal V/f output voltage
Output voltage
Action scope Action scope Time
Operation
command