KEB COMBIVERT F5 Reference Manual page 158

LE - Encoder Parameters
LE06
Encoder 1 Pole
Position
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LE07
Rotor Detection Mode
158
This parameter displays the position of the encoder in relation to one of the
motor poles. This may often be referred to as the encoder position.
The parameter is only applicable to PM Synchronous motors. Refer to Section
5.10.1 or 5.10.2 for the procedures to learn the pole position.
The pole position must be known for proper operation of a PM
Synchronous motor. Failure to learn the pole position may result in
excessive current draw and may result in loss of control.
If the encoder A/B channel phasing is swapped, there would be a different
corresponding Encoder Pole Position and should be relearned.
The pole position represents an encoder offset in relation to the rotor
aligned to a motor pole. If at any time this physical relationship is
changed (e.g. encoder replaced/removed, encoder slippage), the pole
position must be re-established for proper operation. If the encoder
position is relearned and found to be more than 2,000 from the previous
value, this is an indication of encoder mounting issues. Even if the
encoder appears to be mounted tight to the motor shaft, a small amount
of slippage may accumulate over time or even distance; likewise, encoder
mounting issues may appear due to changes in direction. Refer to Section
7.3 for additional troubleshooting information.
This parameter determines when the drive will automatically determine the
pole position for a PM Synchronous motor.
For incremental encoders, there is no way to determine whether the rotor
position has changed after the pole position has been learned if the encoder
has been powered down since the encoder only provides generic pulses
instead of a unique position. In this case, it is mandatory that the pole position
at least be determined before the first run after every power cycle. Refer to
parameters LX22 and LX23 in section 6.11 for additional Rotor Detection
functionality.
Setting: Description:
Off The function is turned off.
NOP A single pole position learned before each run
is performed. Encoder 1 Pole Position LE06 will
update at the beginning of each run.
NUM
0
1