Function Manual
01/2017
43
The "gantry axes" function can be subdivided into the following functional units:
● Setpoint generation of synchronized axis
● Monitoring of actual value difference
● Referencing and synchronizing the leading axis and synchronized axis
Setpoint generation of synchronized axis
From the point of view of the operator, all coupled gantry axes are traversed as if only one axis, i.e. the leading axis, were
programmed in the NC. Analogously, only the leading axis is programmed in the part program. The commands and traverse
requests from the operator, the PLC interface or via the part program therefore apply in equal measure to all axes in the
gantry grouping.
When the "gantry axes" function is active, the synchronized axis setpoint is generated directly from the setpoint of the
leading axis in all operating modes.
Note
The dynamic control response settings for the leading and synchronized axes must be identical.
Monitoring the actual value difference
The position actual values of the leading and synchronized axes are continuously compared with one another in the
interpolation clock cycle and monitored to check that they are still within the permissible tolerance range.
Machine data can be set to specify the following limit values for alarm output and termination of the traversing motion for
specific axes:
The "Warning limit exceeded" warning will be relayed to the operator when the actual position value difference exceeds the
gantry warning limit:
MD37110 GANTRY_POS_TOL_WARNING (gantry warning limit)
In addition, the following interface signal will be output to the PLC:
DB390x.DBX5005.3 (gantry warning limit exceeded)
When below the warning limit, the message and interface signal will automatically be cancelled.
When MD37110 = 0 the message will be disabled.
Alarm 10653 "Error limit exceeded" will be signaled when the machine's maximum permissible actual position value
deviation is exceeded:
MD37120 GANTRY_POS_TOL_ERROR (gantry trip limit)
In order to prevent any damage to the machines, the gantry axes will be immediately shut down via the break ramp.
The value of MD37120 is applied when the gantry grouping is synchronized.
The alarm must be acknowledged with "RESET".
In addition, the following interface signal will be output to the PLC:
DB390x. DBX5005.2 (gantry trip limit exceeded)
If the gantry axis grouping has not yet been synchronized, the limit value for the gantry trip limit is derived from the following
machine data:
MD37130 GANTRY_POS_TOL_REF (gantry trip limit for referencing)
The "Gantry trip limit exceeded" IS is also output if the gantry grouping is jammed (no servo enable, gantry grouping in
"Hold" state).
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