72
It is necessary to determine whether or not the motor encoder is in
phase with the rotation of the motor. As an example the motor is turning
clockwise and the encoder is indicating clockwise rotation. The problem
comes when the encoder indicates rotation opposite to the actual rotation
of the motor. Depending on whether the system is operating in speed
control mode or torque control mode it will be necessary to follow one of
the following two procedures.
Speed Control, LF.30 = 2
To determine whether or not the encoder is aligned with the motor run the
car on inspection in both the up and down direction. If the motor turns
out of control, at the wrong speed, or the current going to the motor (see
LF.93) is greater than the motor FLA, the encoder is reversed. This can
be corrected by adjusting parameter LF.28 from 0 to 1.
Run the car again in both the up and down direction. The motor should
now be running in a controlled manner but possibly in the wrong direction,
meaning up inspection drives the car down or down inspection drives the
car up. Parameter LF.28 can also be used to correct this. If LF.28 = 0
then change the value to 2. If LF.28 = 1 then change the value to 3. Now
the motor should be controlled and run in the correct direction.
Torque Control, LF.30 = 4
To determine whether or not the encoder is aligned with the motor run
the car on inspection in both the up and down direction. If the motor
turns out of control, at the wrong speed, or the current going to the motor
(see LF.93) is greater than the motor FLA, the encoder is reversed.
This can be corrected by adjusting parameter LF.28. You will need to
try all possible settings, LF.28 = 0,1,2,3. One of them should give you
controlled operation of the motor and motor current below the FLA of the
motor. However the direction of travel of the car in the hoist way may
be reversed. If this is the case change LF.28 as described below and
reverse the speed reference direction in the elevator controller.
Changes to LF.28 to reverse car direction
0 -> 2 1 -> 3
or or
2 -> 0 3 -> 1
Changes to LF.28 to reverse encoder counting direction
0 -> 1 2 -> 3
or or
1 -> 0 3 -> 2
5.11.5 Encoder
Synchronization
TTL, HTL, SIN/COS
Encoders with induction
motors
Initial Start Up
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