6It is necessary to determine whether or not the motor encoder is inphase with the rotation of the motor. As an example the motor is turningclockwise and the encoder is indicating clockwise rotation. The problemcomes when the encoder indicates rotation opposite to the actual rotationof the motor. Depending on whether the system is operating in speedcontrol mode or torque control mode it will be necessary to follow one ofthe following two procedures.Speed Control, LF.30 = 2To determine whether or not the encoder is aligned with the motor run thecar on inspection in both the up and down direction. If the motor turnsout of control, at the wrong speed, or the current going to the motor (seeLF.3) is greater than the motor FLA, the encoder is reversed. This canbe corrected by adjusting parameter LF.28 from 0 to 1.Run the car again in both the up and down direction. The motor shouldnow be running in a controlled manner but possibly in the wrong direction,meaning up inspection drives the car down or down inspection drives thecar up. Parameter LF.28 can also be used to correct this. If LF.28 = 0then change the value to 2. If LF.28 = 1 then change the value to 3. Nowthe motor should be controlled and run in the correct direction.Torque Control, LF.30 = 4To determine whether or not the encoder is aligned with the motor runthe car on inspection in both the up and down direction. If the motorturns out of control, at the wrong speed, or the current going to the motor(see LF.3) is greater than the motor FLA, the encoder is reversed.This can be corrected by adjusting parameter LF.28. You will need totry all possible settings, LF.28 = 0,1,2,3. One of them should give youcontrolled operation of the motor and motor current below the FLA of themotor. However the direction of travel of the car in the hoist way maybe reversed. If this is the case change LF.28 as described below andreverse the speed reference direction in the elevator controller.Changes to LF.28 to reverse car direction0 -> 2 1 -> 3or or2 -> 0 3 -> 1Changes to LF.28 to reverse encoder counting direction0 -> 1 2 -> 3or or1 -> 0 3 -> 25.11.4 EncoderSynchronizationInitial Start UpTTL, HTL, SIN/COSEncoders with inductionmotors
