YASKAWA VARISPEED-616G5, Instruction Manual

Page: 162 / 355

Advanced Operation
7.1.4 Operation Selection when Output Voltage Saturated
7 - 8
D
The default setting depends upon the Inverter capacity.
(The table shows the default settings for 200 V class, 0.4 kW Inverters.)
D
Set the motor terminal resistance (U − V, V − W, and W − U) in constant E2-05. Normally this value isn’t
shown on the motor nameplate, so it might be necessary to contact the motor manufacturer for the ter-
minal resistance at the insulation class temperature. Use the following equations to calculate the resis-
tance value from the terminal resistance of a test report.
•
E-class insulation: Terminal resistance at 75
°
C in the test report (
Ω
) x 0.92
•
B-class insulation: Terminal resistance at 75
°
C in the test report (
Ω
) x 0.92
•
F-class insulation: Terminal resistance at 115
°
C in the test report (
Ω
) x 0.87
Motor Leakage Inductance: E2-06
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
E2-06
(E5-06)
Motor leak induc-
tance
×
0.0 to 30.0 % 18.2
× ×
A A
D
The default setting depends upon the Inverter capacity.
(The table shows the default settings for 200 V class, 0.4 kW Inverters.)
D
Set the voltage drop (caused by the motor’s leakage inductance) as a percentage of the motor’s rated
voltage in constant E2-06.
D
This constant does not normally required setting because the Inverter automatically compensates dur-
ing operation.
D
Normally this value isn’t shown on the motor nameplate, so it might be necessary to contact the motor
manufacturer. It is also acceptable to set the loss (caused by the motor’s leakage inductance) as a per-
centage.
Motor Iron-core Saturation Coefficients 1, 2: E2-07, E2-08
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
E2-07
Motor iron-core sat-
uration coefficient 1
×
0.00 to 0.50 − 0.50
× ×
A A
E2-08
Motor iron-core sat-
uration coefficient 2
×
0.00 to 0.75 − 0.75
× ×
A A
D
Constants E2-07 and E2-08 are not required when using the motor at or below the rated frequency.
D
Set these constants when operating at a frequency higher that the motor’s rated frequency. Set the fol-
lowing values:
•
Motor iron-core saturation coefficient 1: Core-saturation coefficient when magnetic flux is 50%.
•
Motor iron-core saturation coefficient 2: Core-saturation coefficient when magnetic flux is 75%.
D
Normally these values aren’t shown on the motor nameplate, so it might be necessary to contact the
motor manufacturer. Operation will be possible with the factory-preset values.
7.1.4 Operation Selection when Output Voltage Saturated
The Inverter cannot output a voltage that is higher than the input voltage. If the output voltage command
to the motor (monitor constant U1-06) exceedes the input voltage in the high-speed region, the output volt-
age will become saturated, and the control unstable with open loop vector control.
Select one of the following methods to prevent this unstable condition.
J
Limited Output Voltage Operation: C3-06 (for SPEC: F)
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
C3-06
Limited output volt-
age operation
×
0, 1 1 0
× ×
A A
D
Settings
Setting Function
0
Disables limited output voltage operation.
1 Enables limited output voltage operation.
7