5.5 E: Motor Parameters
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 219
Setting the No-Load Current
Enter the no-load current at rated frequency and rated voltage to E2-03. The no-load current is not usually listed on the
nameplate. Contact the motor manufacturer if the data cannot be found.
The default setting of the no-load current is for
performance with a 4-pole YASKAWA motor.
Setting the Number of Motor Poles
Enter the number of motor poles as indicated on motor nameplate. This is required when A1-02 = 0 to 3 (induction motor
control methods).
Setting the Line-to-Line Resistance
E2-05 is normally set during Auto-Tuning. If Auto-Tuning cannot be performed, contact the manufacturer of the motor to
find out what the correct resistance is between motor lines. The motor test report can also be used to calculate this value:
• E-type insulation: Multiply 0.92 times the resistance value
() listed on the test report at 75C.
• B-type insulation: Multiply 0.92
times the resistance value () listed on the test report at 75C.
• F-type insulation: Multiply 0.87 times t
he resistance value () listed on the test report at 115C.
Setting the Motor Leakage Inductance
The motor leakage inductance set to E2-06 determines the amount of voltage drop relative to the motor rated voltage.
This value should be entered particularly for motors with a low degree of inductance, such as high-speed motors. As this
information is not listed on the motor nameplate, contact the motor manufacturer to find out the correct value for the
motor leakage inductance.
Setting the Motor Iron-Core Saturation Coefficient 1, 2
E2-07 and E2-08 are set when Auto-Tuning is performed.
Setting the Motor Mechanical Loss
The drive only requires this information when using Closed Loop Vector Control. The drive compensates for the degree
of mechanical loss with torque compensation. Although E2-09 rarely needs to be changed, adjustment may benefit the
following circumstances:
• When there is a large amount of torque
loss due to motor bearing friction.
• When there is a large amount of torqu
e loss in a fan or pump application.
Setting the Motor Iron Loss for Torque Compensation
This value only needs to be set when using V/f Control. Enter this value in watts to E2-10. The drive uses this setting to
improve the precision of torque compensation.
E3: V/f Pattern for Motor 2
These parameters set the V/f pattern used for motor 2. Refer to Setting 16: Motor 2 selection on page 240 for details on
switching motors.
Note: As the function for switching between two motors cannot be used with a PM motor, the E3- parameters will be hidden when
a PM motor control mode is selected (A1-02 = 5, 6, or 7).
E3-01: Motor 2 Control Mode Selection
Selects the control mode for motor 2. A control mode for PM motors cannot be selected for motor 2.
Note: 1. E3-01 dependant parameters are reset to the default settings when E3-01 is changed.
2. Protection from motor overload (oL1) is determined by L1-01, just as it is for motor 1.
Setting 0: V/f Control
Setting 1: V/f Control with PG
Setting 2: Open Loop Vector Control
Setting 3: Closed Loop Vector Control
No. Parameter Name Setting Range Default
E3-01 Motor 2 Control Mode Selection 0 to 3 0
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