Yaskawa G5HHP Drive - Manual (Page 173)

7.1 Open-loop Vector Control
7 - 9
Motor Line-to-line Resistance: E2-05
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
E2-05
(E5-05)
Motor line-to-line re-
sistance
x
0.000 to
65.000
Ω 0.020 A A A A
D
The default setting depends upon the Inverter capacity.
(The table shows the default settings for 400-V class, 200 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 termi-
nal resistance at the insulation class temperature. Use the following equations to calculate the resistance
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 inductance x 0.0 to 30.0 % 5.0 x x A A
D
The default setting depends upon the Inverter capacity.
(The table shows the default settings for 400-V class, 200 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 during
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 percent-
age.
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 satu-
ration coefficient 1
x 0.00 to 0.50 -- 0.50 x x A A
E2-08
Motor iron-core satu-
ration coefficient 2
x 0.00 to 0.75 -- 0.75 x x 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 mo-
tor manufacturer. Operation will be possible with the factory-preset values.
7