Siemens Micromaster Eco, Reference Manual

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ECO REFERENCE MANUAL
6-1
6. ENERGY SAVING PROGRAM
ENERGY CONTROL OPTIMIZATION
(P077)
This feature provides :
•
“Energy Control Optimization” (Eco)
•
Automatically increases and decreases motor
voltage in order to search for the minimum
power consumption
•
Operates when the setpoint speed is reached
•
Factory default setting
voltage (V)
voltage (V)
frequency (Hz)
optimum
efficiency
The Eco starts to analyse the power consumption
of the motor as soon as the motor has reached
setpoint speed (i.e. when acceleration is
complete).
It then begins to search for the optimum
efficiency (lowest power consumption) by slightly
lowering or raising the output voltage to the
motor.
For example, if the Eco detects that the power
consumption is increasing as it is increasing the
voltage to the motor, then the control strategy will
begin to decrease the output motor voltage in
search of the lowest power consumption level.
The converse of this will also apply, again to
automatically determine the lowest power
consumption level.
The Control Mode (P077=4) is set to Energy
Control Optimisation as the factory default.
The amount of additional energy saved using this
optimisation technique can vary considerably and
is dependent on motor loading, motor type and
duty cycle. Typical additional savings can be
between 2% and 5%.