Fuji Electric frenic mini series - Page 210

9.2 Details of Function Codes
9-25
Chap. 9 FUNCTION CODES
F23 Start Frequency
F25 Stop Frequency
The start frequency refers to the output frequency that the inverter should output at start up. The
inverter shuts down its output at the stop frequency.
Set the start frequency to a level that will enable the motor to generate enough torque for startup.
Generally, set the rated slip frequency to F23.
㩷
- Data setting range: 0.0 to 60.0 (Hz) (for both start and stop frequencies)
If the start frequency is lower than the stop frequency, the inverter cannot output
any power as long as the set frequency does not exceed the stop frequency.
F26 Motor Sound (Carrier frequency) Refer to H98.
Sets the carrier frequency.
- Data setting range: 0.75 to 15 (kHz)
Carrier frequency 0.75 to 15 kHz
Motor running noise Noisy to quiet
Output current waveform Poor to good
Leakage current level Low to high
- Changing the carrier frequency may
decrease the motor running noise,
leakage current from the output lines,
and electric noise from the inverter.
Electric noise level Low to high
Lowering the carrier frequency increases the ripple components (harmonic
components) on the output current waveform so as to increase the motor's powe
r
loss and raises the temperature of the motor. If the carrier frequency is set at 0.75
kHz, for example, estimate the motor output torque at 85% or less of the rated moto
r
torque.
On the contrary, raising the carrier frequency increases the inverter’s power loss
and raises the temperature of the inverter. The inverter has a built-in overload
protection facility that automatically decreases the carrier frequency to protect the
inverter. For details about the facility, refer to function code H98.