Stall Prevention Function - Omron RX Series User Manual

 Implementation of the vector control functions
With sensorless vector control, the inverter realizes a high starting torque at 200% of the motor
rating in 0.3 Hz.
With 0-Hz sensorless vector control, the inverter can also output a high starting torque at 150% of
the motor rating in even lower frequencies.
The inverter has various vector control functions as listed below, in addition to V/f control.
• Sensorless vector control
• 0-Hz sensorless vector control
• Sensor vector control
 Availability of position control by the feedback
The inverter can realize accurate position control by feeding back the load-side position information,
just like a servo system. It is effective to save costs for the whole sysytem because the position
control system with a motor over 15 kW is available, and also other position controllers are
unnecessary if the inverter's internal position control function is used.
This inverter has the following position control functions.
• Absolute position control mode and high-resolution absolute position control mode that can
control up to 8 points
• Pulse train position control mode that can control via pulse input from the host controller
• Orientation function that controls a rotating shaft to stop at a fixed position
 PID control function
The inverter provides PID control that adjusts the feedback value to match the target value.
This is available to the process control such as temperature, pressure, flow rate without temperature
controller or external controller.
 Power interruption restart function
If a momentary power interruption occurs during operation, the inverter automatically recognizes the
rotation speed of the motor at power recovery, without detecting undervoltage, to enable a smooth
restart.
 Stall prevention function
Induction motors may stall (or step out) if a large load is applied due to rapid acceleration or load
fluctuation.
This inverter has the overload limit function that prevents such a stall condition and ensures a
persistent operation.
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
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