Yaskawa MP930 - Manual (Page 238)

7.2 Starting the Absolute Position Detection Function
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Setting the Number of Encoder Pulses
This parameter is used to set an applicable number of absolute encoder pulses at fixed parame-
ter 8 for the MP930 and user constant Cn-0011 for the Servopack.
D MP930 fixed parameter 8
D Servopack user constant Cn-0011
Note: Be sure to set both parameters.
Infinite Length Mode Axis/Finite Length Mode Axis Selection
This setting is used to set limits for controlled axis movement.
Maximum Number of Absolute Encoder Rotations (Fixed
Parameter No. 23)
The difference between machine coordinate values stored when power is turned OFF and ma-
chine coordinate values the next time power is turned ON is converted to pulses, but an ABS
Encoder Rotation Exceeded error will be generated if the converted number of pulses is greater
than number of pulses for half the maximum number of absolute encoder rotations.
Maximum Infinite Length Counter Value
The Maximum Infinite Length Counter value is used to set the number of Infinite Length Mode
Axis rotations in reference units. This parameter is enabled when an absolute encoder is used
as an Infinite Length Mode Axis.
Zero Point Position Offset Setting for a Machine Coordinate
System
This parameter is used to determine the zero point position of a machine coordinate system.
Its meaning will depend on the type of encoder that is used and whether Finite Length Mode
Axis or Infinite Length Mode Axis is selected.
Finite Length
Mode Axis INC axis Parameter (OLxx06): ABS OFF is always enabled.
Mode Axis
ABS axis Parameter (OLxx06): ABS OFF is always enabled.
Infinite Length
Mode Axis INC axis Parameter (OLxx06): ABS OFF is always enabled.
Mode Axis
ABS axis Only enabled when a zero point is set. (Used to define
ABS System Infinite Length Mode Axis Control Data.)
D ABS Finite Length Mode Axis
Setting parameter OLxx06: Zero Point Position Offset Setting is always valid. The zero
point for the machine coordinate system can be changed simply by changing this parame-
ter. This is why the zero point does not have to be set in ABS Finite Length Mode.
D ABS Infinite Length Mode Axis
Setting parameter OLxx06: Zero Point Position Offset Setting is always valid when a zero
point is set. If the zero point position offset is set when a zero point is set, the positive elec-
tronic gear conversion value is used as the current machine coordinate system position.
Set the desired position at setting parameter OLxx06: Zero Point Position Offset Setting.
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