4-247
Figure 4.4.89 Rated voltage and frequency settings
Step 1: Set motor rated voltage, 17-03=440V.
Step 2: Set no-load voltage, 17-08=360V, lower the input voltage by 20V when operating in torque control.
Step 3: Set motor rated frequency:
Step 4: Automatically tuning
Parameter 01-12 (Fbase) is automatically set during auto-tuning. Parameter 01-12 (Fbase) is set to the
motor rated frequency.
Step 5: Set the 01-12 (Fbase) to the motor rated frequency on the motor nameplate. If the maximum
output frequency (01-02, Fmax) and base frequency (01-12, Fbase) are different, set the maximum output
frequency when the auto- tuning (01-02, Fmax) is completed.
When the inverter input voltage (or frequency) is higher than the motor rated voltage (or frequency), set the
motor rated voltage (17-03) and the motor rated frequency (17-04) to the rated frequency on the motor
nameplate.
Example 2: The inverter input voltage and frequency (440V/50Hz) are higher than the motor rated voltage
and frequency (380V/33Hz), set 17-03 to 380V (rated motor voltage) and 17-04 to 33Hz (motor rated
frequency).
■ Number of poles (17-06)
Set the motor pole number with its range is 2, 4, 6, 8 and 16 poles. (It is only 2~8 poles in inverter
software V1.3.
■ Motor no-load voltage (17-08)
a) Motor no-load voltage is mainly used in SLV mode, set to value 10~50V lower than the input
voltage to ensure good torque performance at the motor rated frequency.
b) Set to 85 ~ 95% of the motor rated voltage. In general, the no-load voltage can be closer to the
motor rated voltage for larger motors, but cannot exceed the motor rated voltage.
c) The motor no-load voltage can be set to a value greater than the actual input voltage. In this case,
the motor can only operates under relatively low frequency. If the motor operates at the rated
frequency an over voltage condition may occur.
d) The higher the motor power is, the higher the no-load voltage is.
e) A smaller no-load voltage will reduce the no-load current.
f) When load is applied the magnetic flux is weakened and the motor current increases.
g) A higher no-load voltage results in a higher the no-load current.
h) When load is applied the magnetic flux weakens and the motor current increases. Increasing the
magnetic flux generates back EMF and results in poor torque control.
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