Encoder Resolution Multiplier; Absolute Encoder Position - KEB COMBIVERT F5 Instruction Manual

Encoder resolution
multiplier
Absolute encoder position
Parameter Description
This parameter can be used to increase the resolution of encoders
with analog sine/cosine tracks. The encoder types are SIN/COS,
Hiperface, EnDat.
Unit: 1
Value range: 0...13
Default setting: 2 for incremental encoders
8 for Sin/Cos, EnDat, or Hiperface encoders
The value corresponds to the multiplier using the following relation.
Actual Encoder Resolution = Encoder base ppr x 2
Example: Sin/Cos encoder with base resolution of 2048 ppr
With LF.76 = 8 the actual measured resolution is:
2048 x 2 = 524288 counts / rev
8
Higher values give better resolution especially for gearless applications.
However higher values make the system more susceptible to
disturbances due to noise. Therefore the actual value which can be
used will ultimately be limited by the noise being picked up on the
encoder cable.
This parameter is only visible in closed loop PM motor mode (LF.4
= PCLSd or PLSS). LF.77 displays the position of the encoder in
relation to one of the motor poles.
Unit: 1
Value range: 0 ... 65535h
Default setting: 0
Adjusted value: according to encoder position
If the position value is already known, simply enter the value in this
parameter. If it is not known then follow the procedure in section
5.11.1 to measure the position. If the encoder was pre-programmed
by the motor vendor, this value can be read out from the encoder in
parameter 3.LF.26. Refer to section 5.8.3.

If the position is not known, then the drive will
determine the correct position value. This process
is best done when the motor is free to turn,
i.e. without the ropes on the main sheave.
If the it is not possible to remove the ropes from the sheave then it
can be possible to make this measurement with a balanced car.
See section 5.11.1 and 5.11.2 for learn procedures.
(LF76)
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