5.3 Description of Function Codes 5.3.8 J codes (Applied functions)
Servo lock precautions
(1) Positioning control error ero
If a positioning error exceeds the value equivalent to four rotations of the motor shaft when the inverter is
servo locked, the inverter issues a positioning control error signal ero.
(2) Stop frequency (F25) under servo lock
Since servo lock starts when the output frequency is below the stop frequency (F25), it is necessary to specify
such F25 data that does not trigger ero (that is, specify the value equivalent to less than 4 rotations of the
motor shaft).
Stop frequency (F25) < (4 x Gain (J97) x Maximum frequency)
(Example) When Gain (J97) = 0.01 and Maximum frequency (F03) = 60 Hz, specify F25 data < 2.4 Hz.
(3) The following functions are ignored in the servo lock mode
• Frequency/speed control specified with the stop frequency
• Rotation direction limitation
PID control 1 (Display unit, Maximum scale, Minimum scale)
Refer to the description of J02.
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