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8. Offset Adjustment of Closed loop Analogue system
When the position controller is connected to the motor drive, it is possible to come “into
position” with an error, due to an analogue offset voltage.
This error can be compensated for by adjusting the offset potentiometer of the drive
(analogue drives).
Typical procedure is as follows :-
a) Connect up Controller and Drive
b) Set R57 (Encoder Resolution). The other Registers can be taken as default values.
c) To achieve the greatest resolution in the display, set R96 (multiplication factor) to
100000 and R56 (edge multiplier) to 4. This is regardless what you will need for final
operation of the system.
d) Enter a dimension and execute a move.
If the exact position cannot be reached, then the drive offset is not correctly set.
e) Adjust the offset potentiometer in the drive until actual position equals the Target.
f) Execute several more moves in both directions and adjust offset to the optimum.
g) Check effect of offset in both directions. If correct positioning cannot be effected by
the offset potentiometer, it is necessary to first make adjustments to Parameters
R52-55.
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