Specifications

55
Constant Descriptions
10. Energy-saving Control 11. Use Constant Copy Function
Use Energy-saving Mode
Energy-saving mode selection b8-01
Energy-saving coefficient b8-04
Set b8-01 (energy-saving mode selection) to 1, and energy-
saving control is enabled.
For the constants used in the energy-saving mode, the
optimum values have been set at factory. They do not have
to be adjusted under normal operation.
If the motor has very different characteristics from those of
YASKAWA standard motors, refer to the following
description of the constants and change them. The
following describes the case where constant A1-02 is set to
0 (V/f control without PG) or 1 (V/f control with PG).
Energy-saving coefficient (b8-04)
In the energy-saving mode, the voltage at which the motor
efficiency will be the maximum is calculated using this
energy-saving coefficient, which is regarded as output
voltage reference. This value has been set to the
YASKAWA standard motors as the factory setting.
Increasing the energy-saving coefficient makes output
voltage larger.
When using any motor other than YASKAWA standard
motors, change the value by approx. 5 ％ from the
factory setting so that you can find the optimum value
in which output power will be the minimum.
0
Energy-saving disabled
1
Energy-saving enabled
b8-01 Setting Energy-saving Mode
Copy or Compare Constants
Copy function selection o3-01
Read permitted selection o3-02
The Varispeed G7 standard digital operator (JVOP-160) can
store the inverter constants.
The constant capacity to be stored is for one unit.
Since EEPROM (non-volatile memory) is used as the data
memory elements, any backup power supply is not needed.
Copy function selection (o3-01)
Constants can be written (copied) only between the
Varispeed G7 units with the same product code, software
number, capacity and control mode (V/f control without
PG, V/f control with PG, open-loop vector control or vector
control with PG). If the conditions are not met, the digital
operator displays an error such as CPE (ID unmatched),
vAE (inverter capacity unmatched) or CrE (control mode
unmatched).
The digital operator uses the incorporated EEPROM to
perform the following three functions:
・Stores inverter constant set values in the digital operator
(READ).
・Writes in the constant set values stored in the digital
operator to the inverter (COPY).
・Compares the inverter constants with the constants
stored in the digital operator (VERIFY).
（1）READ
Set o3-01 to 1 so that the inverter constant set values
will be stored in the digital operator.
（2）COPY
Set o3-01 to 2 so that the constant set values stored in
the digital operator will be written in to the inverter.
（3）VERIFY
Set o3-01 to 3 so that the inverter constants will be
compared with the constant set values in the digital
operator.
Read permitted selection (o3-02)
Prohibition of constant read-out form the inverter can be
set. By using this function, you can prevent the constant
stored in the EEPROM of the digital operator from being
changed by mistake.
By setting o3-02 to 0, reading operation is disabled so that
the constant data stored in EEPROM of the digital operator
can be protected.
0
Normal operation
(Factory setting: o3-01)
1
READ (from inverter to operator)
2
COPY (from operator to inverter)
3
VERIFY (comparison)
o3-01 Setting Contents
0
READ prohibited
(Factory setting: o3-02 = 0)
1
READ permitted
o3-02 Setting Contents