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6 Vector Control
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
6-7 Absolute Position/High-resolution Absolute Position Control Mode
6
6-7-2 Operation Sequences
• This function is enabled when the 1st Control Method (A044) is set to 05 (Sensor vector control) to
set the motor shaft in a speed servo lock state.
Set the Multi-function Input S1 to S8 Selection (C001 to C008) to 54 (SON: Servo ON).
Once the SON function is allocated, the inverter does not accept the RUN command unless the SON
terminal turns ON.
If the SON terminal turns OFF during operation, the inverter will fall in a free-run state. In this case,
turning ON the SON terminal again causes the inverter to restart according to the Free-run Stop
Selection (b088) setting.
• Do not set the Multi-function Input S1 to S8 Selection (C001 to C008) to 55 (FOC: Preliminary
excitation).
6-7-2 Operation Sequences
Servo ON Function
Parameter No. Function name Data Default data Unit
C001 to C008
Multi-function Input S1 to
S8 Selection
54: SON (Servo ON)
55: FOC (Preliminary excitation)
––
b088 Free-run Stop Selection
00: 0-Hz restart
01: Frequency matching restart
02: Frequency pull-in restart
00 –
SON
FW (RV)
Output
Frequency
Speed servo-lock status
ON ON
ON
ON ON
Free running Restarts according to b088.
Does not operate because
the SON terminal is OFF.
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