Mitsubishi Electric 800 Series Instruction Manual page 7

 Motor speed estimation
Motor speed estimation is performed during operation of the SLS, SSM, and SBC functions (when Pr.S023 SBC brake
operation frequency ≠ "0").
 Specifications
Item
Applicable control method
Applicable motor
Speed estimation deviation
Operating speed range
 Operating conditions
• Select a motor with the rated current equal to or less than the inverter rated current. As a reference, select the motor with
the rated motor current that is 40% or higher of the inverter rated current.
• Perform single-motor operation (one motor to one inverter).
• Set "2" or larger value in Pr.72 PWM frequency selection.
• The wiring length from inverter to motor is 100 m or less.
• The function is not available in the following conditions.
• Energy saving operation mode, Optimum excitation control mode.
• Variable torque pattern.
• During offline auto tuning.
• While online auto tuning is performed at startup.
• When starting and stopping or acceleration and deceleration are repeated in a short time (approx. within 2 seconds).
• During DC injection braking, zero speed control, servo lock operation, or magnetic flux decay output shutoff.
• During restart coasting time.
• During test operation.
• When the motor is rotated by external force.
Description
V/F control
Advanced magnetic flux vector control
Real sensorless vector control
Vector control
Induction motor
Motor slip amount
2 to 60Hz
1.1 Compliance with the EU Machinery Directive - Safety sub-functions
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1. INTRODUCTION