Servo-On Function - Hitachi SJ700-2 Instruction Manual

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
ON
ON
Speed-servo locking state
Chapter 4 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"
4 - 114
Related code
ON
The inverter does not
operate the motor because
the SON terminal is off.