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7.2.6.4. In-position Limit: Parameter IN
This parameter states positioning accuracy.
The output IPOS closes when the absolute values in the error counter is less or equal to the
setting value of the parameter IN.
The unit is the resolution of the position sensor (pulse).
Table 7-24: Resolution of positon sensor
Motor type
Resolution
(count/revolution)
PS
2 621 440
◊ For example, the following formula shows how to convert the repeatability of ± 100
arc seconds, which is to be specified for a PS type Motor, to the unit of pulse.
Resolution
IN setting =
360
×
Repeatability
[degree]
2 621 440 100
=
360
×
3600
= 202 [pulse]
7.2.6.5. Parameter IS: In-position Stability Timer
This is to check the stability of positioning operation.
In case of the IPOS mode, the output IPOS signal might become unstable at settling stage of a
positioning if the parameter IN is set to low value (approximately IN100 or lower) even the
servo gain is well tuned.
◊ Setting the parameter IS is to prevent the problem.
In case of both CFIN mode and FIN mode, the setting of parameter IS prevents outputting IPOS
signal before the Motor settles in the position.
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