How can I use ATV to operate a single phase motor? how can I change the speed of single phase motor via ATV11 / ATV12 / ATV312 / ATV71**M3 drives?
Causes and Fixes
·If it is a 3-phase motor with capacitor to reconstitute a phase, remove the capacitor and connect U, V, W to the motor.
·If it's a true single phase asynchronous motor correct operation is not guaranteed in order to start, a second winding is inserted in the stator with a shift of 90°. This auxiliary phase is supplied with a phase difference (capacitor or inductance), once the starting is finished this auxiliary phase can be suppressed.
·If the motor is equipped with a capacitor this should be removed just after the starting (risk of overheating due to the switching frequency).
·Verify that the motor has an insulation class sufficient to sustain the DC voltage bus voltage (mains voltage *SQR2)
·Connect the motor to U and W.
·Enter the motor nameplate data (UNS,FRS, NCR, NSP),
·Set the the switching frequency at minimum
·Choose the Volts/Hertz law
·Deactivate the sensing of output phase loss: OPL=no
·For the first try, set a acceleration time that is not too short (>5s)
Altivar VFD’s should be selected based upon current rating of motor.
Correct working is not guaranteed because the Altivar 11 / 31 / 71 are optimized for three-phase