Omron RX Series - Page 312

6 Vector Control
6 - 44
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
Precautions for Correct UsePrecautions for Correct Use
Inputting the servo ON (SON) signal causes the motor shaft to be locked in a speed servo lock
state.
However, because this is not the position servo lock function, the stop position will be misaligned
when the speed is offset.
To prevent this misalignment of the stop position, input the RUN command (FW or RW) to set the
motor shaft in a position servo lock state. Follow the steps below to control the stop position.
(1) After inputting the servo ON (SON) signal, perform origin search operation. Unless you
perform origin search operation, the position in which the power supply is turned ON will be
the origin (position 0).
(2) Set the Multi-step Position Command 0 (P060) to 0 and, with the Multi-step Position
Command 0 selected, input the RUN command (FW or RV).
(3) The inverter will move the motor to the next target position in the timing based on the
multi-step position switching function (CP1/CP2/CP3) described later. When you change the
position command selection 1 to 3 set in C001 to C008, the inverter moves the motor to the
next target position at that time. The RUN command (FW or RV) must be input constantly.
(4) Subsequently, the servo ON (SON) and RUN command (FW or RV) signals will be controlled
to turn ON/OFF in the same timing.
In the absolute position control mode/high-resolution absolute position control mode, the inverter
moves the motor to the target position according to the Acceleration Time or Deceleration Time
parameter settings and then falls in a position servo lock state.
The servo lock state will be maintained until the RUN command turns OFF.
• Under absolute position control, the inverter operates according to the frequency reference and
acceleration/deceleration command settings selected for the RUN command.
• If the position command has a small value, the inverter may perform positioning before the speed
command value is reached.
Inverter Operation in Absolute Position/High-resolution Absolute
Position Control Mode
Position
Speed
Command
RUN Command
POK Signal
Positioning Completion Delay Time Setting (P018)
ON
ON
Output Frequency
[Hz]
Positioning Completion Range Setting (P017)
When the position command level is
low, the motor decelerates and its
position is determined before the
output frequency reaches the speed
command level.