Frequency inverter shows error code F08

    The inverter displays F08

    According to the error list, error code F08 describes a speed monitoring error.

    Fehler Drehzahlüberwachung

    Common causes

    • Unplugged cable to the drive
      • Cable on the inverter (black plug on the underside of the device)
      • Harting connector on the drive
    • Blocked / jammed / wedged accumulation roller chain
      • especially with head drives that have run in the wrong direction during initial commissioning
    • Heavily soiled chain guide profiles
      • especially after longer system shutdowns over the weekend / after the holiday period
    • Frequent switching on and off of the drive during the process (several times per minute)

    Problem solution

    • Check the electrical connection between the inverter and drive
      • It is also possible that individual phases within the plug wiring have no electrical connection
    • Making the accumulation roller chain operational again (especially with head drives during commissioning, partial disassembly may be necessary)
    • Cleaning the chain guide profiles
    • Increase the maximum permitted motor current (parameter 303, see Changing parameters on the inverter)
      • The default setting of parameter 303 is 150% of the motor nameplate current (observe the star triangle!) in relation to the rated output current of the inverter. Example:
        • Umrichter-Ausgangsnennstrom IA: 1,0A (fast alle Umrichter entsprechen dieser Baugröße, siehe Umrichter-Typenschild)
        • Nominal motor current IN: 0.73A (see rating plate)
        • Standard value of parameter 303 for the above combination: In * 100/Ia * 1.5 = 110%
        • The parameter should be increased on the motor side in small steps to a maximum of 175% of the rated motor current (* 1.75 instead of * 1.5)
        • The parameter can be set to a maximum of 150% of the rated inverter output current
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