5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Motor sound (tone) (F27)
F27 changes the motor running sound tone (only for motors under V/f control). This setting is effective when the
carrier frequency specified by function code F26 is 7 kHz or lower. Changing the tone level may reduce the high
and harsh running noise from the motor.
If the tone level is set too high, the output current may become unstable, or mechanical vibration and
noise may increase. Also, this function code may not be very effective for certain types of motor.
F29 to F31, F58, F59
F32, F60 to F63
Terminal [FM1]
(Operation selection, Output gain, Function selection, Filter, Bias)
Terminal [FM2]
(Operation selection, Output gain, Function selection, Filter, Bias)
These function codes allow outputting monitor data such as output frequency and output current to terminals [FM1]
and [FM2] as analog DC voltage, current, and pulse. In addition, voltage and current output level on terminals [FM1]
and [FM2] is adjustable.
When switching voltage, current, and pulse, it is necessary to switch both mode selection function code
and switch on the PCB.
◼ Operation selection (F29, F32)
Selects the output form for terminal [FM1] and [FM2]. Also change switches SW4 and SW6 on the PCB.
For details of the switches on the control PCB, refer to Chapter 12 “SPECIFICATIONS.”
Terminal [FM1], [FM2] output form
Voltage output (0 to +10 VDC) (unipolar)
Current output (4 to 20 mA DC)
Current output (0 to 20mA DC)
Voltage output (0 to ±10 VDC) (bipolar)
The output current is not isolated from analog input, and does not have an isolated power supply.
Therefore, if an electrical potential relationship between the inverter and peripheral equipment has been
established, e.g., by connecting an analog input, cascade connection of a current output device is not
available.
Keep the optimum connection wire length.
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