Yaskawa VS-626 MC5 - Manual (Page 153)

7.2 Flux Vector Control
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Motor Iron-core Saturation Coefficients 1, 2: E2-07, E2-08
User
Change
during Setting Factory
Valid Access Levels User
Constant
Number
Name
during
Opera-
tion
Setting
Range Unit
Factory
Setting Open Loop
Vector
Flux Vector
E2-07
Motor iron-core satura-
tion coefficient 1
0.00 to 0.50 -- 0.50 A A
E2-08
Motor iron-core satura-
tion 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:
x Motor iron-core saturation coefficient 1: Iron-core saturation coefficient when magnetic flux is
50%.
x Motor iron-core saturation coefficient 2: Iron-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.
Motor Mechanical Loss: E2-09
User
Change
during Setting Factory
Valid Access Levels User
Constant
Number
Name
during
Opera-
tion
Setting
Range Unit
Factory
Setting Open Loop
Vector Flux Vector
E2-09 Motor mechanical loss 0.0 to 10.0 % 0.0 A
D Normally it isn’t necessary to change this setting in the following cases:
x There is a large torque loss to the motor’s bearings
x There is a large torque loss to a fan or pump
D Set the mechanical loss as a percentage of the motor’s rated output power (W). Constant E2-09 is used
to compensate for torque lost mechanically in the motor.
J Setting the Slip Compensation Gain: C3-01
User
Change
during Setting Factory
Valid Access Levels User
Constant
Number
Name
during
Opera-
tion
Setting
Range Unit
Factory
Setting Open Loop
Vector Flux Vector
C3-01 Slip compensation gain 0.0 to 2.5
Mul-
tiple
1.0 B B
D Normally it isn’t necessary to change this setting.
D With flux vector control, constant C3-01 sets the motor’s temperature compensation gain. Adjust the
setting when a torque limit or torque control is being used and the output torque varies with the ambient
temperature.
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