Measuring The Deviation From Synchronism - Siemens SINUMERIK 840D sl Function Manual
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M3: Coupled axes
5.5 Generic coupling
5.5.12.2
Measuring the deviation from synchronism
The controller measures the difference between the setpoint positions and actual positions
when the following spindle is operating in synchronism. This results in a correction value,
which is saved in a system variable.
Requirements
The following requirements must be met to enable the controller to calculate the correction
value:
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Requirements if the set coupling type is "synchronous spindle" (CPSETTYPE="COUP"):
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Requirements for a free generic coupling with CPFRS="machine":
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Note
Dynamics limit for the leading spindle
The "dynamics limit for the leading spindle" property is specified automatically when the
"synchronous spindle" coupling type (CPSETTYPE="COUP") is set. In the case of other
coupling types, it is the particular responsibility of the user/machine manufacturer to provide
suitable measures to ensure that the following spindle cannot become dynamically
overloaded.
328
The coupling has precisely one leading spindle (requirement is met if
CPSETTYPE="COUP").
The coupling factor (quotient from CPLNUM and CPLDEN) is 1 or -1.
The following value is derived from the setpoint position ("DV") or the actual position
("AV") of the leading spindle.
Setpoint synchronism must be achieved:
DB31, ... DBX99.4 (synchronization running) = 0
Setpoint synchronism must not decline again.
No overlaid movement (DB31, ... DBX98.4 = 0) must be present.
A dynamics limit is required for the leading spindle, in order to exclude the possibility of
the following spindle being subjected to excessive demands.
The configured spindles are coupled.
The coupling has precisely one leading spindle.
The coupling factor (quotient from CPLNUM and CPLDEN) is 1 or -1.
The following value is derived from the setpoint position (CPLSETVAL="CMDPOS") or
the actual position (CPLSETVAL="ACTPOS") of the leading spindle.
Setpoint synchronism must be achieved:
DB31, ... DBX99.4 (synchronization running) = 0
Setpoint synchronism must not decline again.
No overlaid movement (DB31, ... DBX98.4 = 0) must be present.
A dynamics limit is required for the leading spindle, in order to exclude the possibility of
the following spindle being subjected to excessive demands.
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
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