YASKAWA F7

Programming 57
equation to calculate the motor rated slip frequency based on motor nameplate data:
 E2-03 No Load Current
Setting Range: Model Dependent
Factory Default: Model Dependent
Set E2-03 to the motor no-load current at rated voltage and rated frequency. If the rotational Auto-tuning operation completes
successfully (T1-02 = 0), this value is automatically calculated. Consult the motor manufacturer for the proper value if the no
load current is not stated on the motor nameplate.
 E2-04 Number of Motor Poles
Setting Range: 2 to 48
Factory Default: 4
This parameter sets the number of motor poles. During auto-tuning, it is required for the operator to enter the number of motor
poles (T1-06) in the Auto-Tuning menu. If the Auto-tuning operation completes successfully (T1-02 = 0, 1, or 2), the value
entered into T1-06 will automatically be written into E2-04.
 E2-05 Motor Line-to-Line Resistance
Setting Range: 0.0000to 65.000 Ω
Factory Default: 9.842 Ω
Sets the line-to-line resistance of the motor’s stator winding. If the Auto-tuning operation completes successfully (T1-02 = 0, 1,
or 2), this value is automatically calculated. Remember this value must be entered as line-line and not line neutral.
 E2-06 Motor Leakage Inductance
Setting Range: 0.0 to 40.0 %
Factory Default: Model Dependent
Sets the voltage drop due to motor leakage inductance as a percentage of motor rated voltage. If the rotational Auto-tuning
operation completes successfully (T1-02 = 0), this value is automatically calculated.
 E2-07 Motor Iron-core Saturation Coefficient 1
Setting Range: 0.00 to 0.50
Factory Default: 0.50
This parameter sets the motor iron saturation coefficient at 50% of the magnetic flux. If the rotational Auto-tuning operation
completes successfully (T1-02 = 0), this value is automatically calculated.
where:
f
s
f
NP⋅()
120
-----------------–=
f
s
: slip frequency (Hz)
f : rated frequency (Hz)
N : rated motor speed (rpm)
P : number of motor poles
Phase-to-phase Resistance at
Insulation Class Temperature
273 + (25 + insulation class temperature) /2
273 + insulation class temperature
E2-05=
)
(
X
Where: Insulation class temperature is in °C