4-94
11-12
V/F Energy Saving Gain (VF)
Range
【
0 ~ 100
】
%
V/F energy savings reduces the output voltage for the purpose of saving energy.
To enable manual energy savings set one of the multi-function digital input (03-00 to 03-07) to 20 and activate the
input.
When active the inverter output voltage is gradually decreased to match the required torque demand and as a
result saves energy. Only for variable torque applications such as fans and pumps that require less torque when
operation speed is reached. When input is turned off the output voltage gradually increases again back to the
original output voltage.
11-13
Regeneration Prevention Function
Range
【
0
】
:
Regeneration prevention function is disabled
【
1
】
: Regeneration prevention function is enabled
【
2
】
: Regeneration prevention function is enabled only during constant speed
Regeneration prevention function monitors the DC-bus voltage and adjusts the speed reference, acceleration and
deceleration rate, to prevent the inverter from tripping on an overvoltage.
When the speed reference is reduced, the motor will start to decelerate. When the inverter is operating at a fixed
output frequency and excessive regenerative energy back to the inverter is detected the inverter will accelerate
the motor in order to reduce the DC-bus voltage. Refer to figure 4.4.91.
To enable the regeneration prevention function set parameter 11-13 to a value greater than 0.
Example:
Regeneration prevention during acceleration.
Regeneration prevention at work
Vpn(DCV)
Set value of 11-14
Output
frequency
(Hz)
t
t
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