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Chapter 4
4.3.20 Servo-on function
The servo-on function allows you to set the inverter in a speed-servo
locking state with a signal input via an input terminal during operation.
This function is effective when "05" (vector control with sensor) is
specified as the V/F characteristic curve selection (A044).
To use this function, assign function "54" (SON) to an intelligent input terminal.
After the SON function has been assigned, the inverter accepts an operation command only when the SON terminal is
on.
If the SON terminal is turned off while the inverter is operating the motor, the inverter sets the motor into the
free-running state. If the SON terminal is subsequently turned on, the inverter restarts the motor according to the
setting of the festart mode after FRS (b088).
This function cannot be used together with the forcing function (55: FOC). If both the FOC and SON functions are
assigned to different intelligent input terminals, the FOC function has priority over the SON function (the SON function
cannot be used).
SON
FW(RV)
Output frequency
Speed-servo locking state
ON
ON
4-111
Explanation of Functions
A044: V/F characteristic curve selection, 1st
motor
C001 to C008: Terminal [1] to [8] functions
ON
ON
Restarting according to
Free-running
the setting of "b088"
Related code
ON
The inverter does not operate
the motor because the SON
terminal is off.
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