Energy-Saving Control Function; Hunting-Prevention Function - YASKAWA VARISPEED-616G5 Instruction Manual

Advanced Operation

7.4.1 Energy-saving Control Function

7.4.1 Energy-saving Control Function
7

7.4.2 Hunting-prevention 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.
Energy-saving Gain: b8-01
J
User User
Constant Name
Number
b8-01 Energy-saving gain
Constant b8-01 determines the Inverter's output voltage when the energy-saving command is input.
D
Set this value as a percentage of the V/f pattern's voltage.
Constant L2-04 (the voltage recovery time) determines the rate at which the output voltage is changed
D
when the energy-saving command is turned ON or OFF.
Energy-saving Frequency: b8-02
J
User User
Name
Constant
Number
Energy-saving fre-
b8-02
quency
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
D
frequency and the motor speed is within the "speed agree" range.
A time chart for energy-saving operation is shown below.
OFF
Run command
OFF
Energy-saving
command
Output frequency
Output voltage
Fig 7.18
Time Chart for Energy-saving Operation
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.
Hunting Prevention Selection: C7-01
J
User User
Constant Name
Number
Hunting prevention
C7-01
selection
Change g
during during Setting Setting
Opera- Range
tion
0 to 100
×
Change g
Setting Setting
during during
Opera- Range
tion
0.0 to 400.0
×
ON
ON
L2-04
(Voltage recovery time)
Change g
during during Setting Setting
Opera- Range
tion
0, 1
×
7 - 38
Valid Access Levels
Unit Factory Factory
V/f V/f with
Setting
Control PG
% 80 A A
Valid Access Levels
Unit Factory Factory
V/f V/f with
Setting
Control PG
Hz 0.0 A A
Frequency reference ≥ b8-02
(energy-saving frequency)
E1-03 to E1-10 setting × Energy-saving Gain
(b8-01)
Valid Access Levels
Unit Factory Factory
V/f V/f with
Setting
Control PG
− 1 A A
Open
Flux
Loop
Vector
Vector
× ×
Open
Flux
Loop
Vector
Vector
× ×
Open
Flux
Loop
Vector
Vector
× ×