Yaskawa G5HHP Drive - Manual (Page 199)

7.4 V/f Control with PG Feedback
7 - 35
7.4.1 Energy-saving Control Function
The energy-saving control function is enabled when the energy-saving command (setting 63) has been set
in a multi-function input (H1-01 through H1-06). Inputting the energy-saving command while there is a
light load causes the Inverter’s output voltage to be reduced and saves energy. Turn OFF the energy-saving
command when a normal load is added.
J
Energy-saving Gain: b8-01
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
b8-01 Energy-saving gain x 0 to 100 % 80 A A x x
D
Constant b8-01 determines the Inverter’s output voltage when the energy-saving command is input. Set
this value as a percentage of the V/f pattern’s voltage.
D
Constant L2-04 (the voltage recovery time) determines the rate at which the output voltage is changed
when the energy-saving command is turned ON or OFF.
J
Energy-saving Frequency: b8-02
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
b8-02
Energy-saving fre-
quency
x 0.0 to 150.0 Hz 0.0 A A x x
D
Constant b8-02 determines the lower limit frequency for the energy-saving function.
D
The energy-saving command is enabled only when the frequency reference is above the energy-saving
frequency and the motor speed is within the “speed agree” range.
A time chart for energy-saving operation is shown below.
E1-03 to E1-10 setting × Energy-saving Gain
(b8-01)
Run command
Energy-saving
command
Output frequency
Output voltage
OFF ON
Frequency reference ≥ b8-02
(energy-saving frequency)
L2-04
(Voltage recovery time)
OFF ON
Fig 7.17 Time Chart for Energy-saving Operation
7.4.2 Hunting-prevention Function
The hunting-prevention function suppresses hunting when the motor is operating with a light load. This
function is valid with V/f control and V/f with PG feedback control.
7