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EMERSON OVATION 1C31224G01 westinghouse 1C31224G01

This method is used when there is no detectable back EMF, e.g. after longer power losses, when Speed Search is applied with the Run command (b3-01 = 1) or if an External Search command is used. It injects the DC current set in b3-06 to the motor and detects the speed by measuring the current feedback. The drive outputs the detected frequency and increases the voltage using the time constant set in parameter L2-04. If the resulting current is higher than the level in b3-02 the output frequency is reduced. When the current becomes lower than b3-02 the motor speed is assumed to be found and the drive starts to accelerate or decelerate to the frequency reference. 

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