Siemens SINUMERIK 808D Function Manual

Function Manual
44 01/2017
The monitoring functions are deactivated while the grouping is operating in "Follow-up" mode.
Extended monitoring
An extended monitoring function can be activated with the following machine data:
MD37150 GANTRY_FUNCTION_MASK (gantry functions)
Referencing and synchronization of gantry axes
As the example "Gantry-type milling machine" shows, the forced coupling between gantry axes must remain intact in all
operating modes as well as immediately after power ON. In cases where an incremental measuring system is being used for
the leading or the synchronized axis, the reference point must be approached while maintaining the axis coupling
immediately after machine power ON.
After every axis in the gantry grouping has approached its reference point, any misalignment that may exist between the
axes must be eliminated (this is known as the gantry synchronization process). As soon as this has been carried out, the
following interface signal is sent to the PLC: DB390x.DBX5005.5 (gantry grouping is synchronized)
The operational sequence for referencing and synchronizing gantry axes is described in detail under Section "Referencing
and synchronizing gantry axes (Page 44)".
Closed-loop control
The dynamic control response settings for the coupled gantry axes must be identical (see Section "Start-up of gantry axes
(Page 50)"). This ensures that in normal operation, the leading and synchronized axes move in positional synchronism, even
during acceleration and braking.
Load effects are compensated by the appropriate drive of the leading or synchronized axis.
Disturbance characteristic
When a disturbance occurs which causes shutdown of one gantry axis owing, for example, to cancellation of the controller
enabling signal (example: EMERGENCY OFF), the coupled gantry axes are also shut down.
Separation of forced coupling
In certain situations (e.g. one gantry axis is no longer referenced owing to an encoder failure), it may be necessary to correct
or reduce the misalignment between the gantry axes prior to referencing. To do this, it must be possible to traverse the
leading or the synchronized axis
manually in the uncoupled state
.
The forced coupling between the gantry axes can be separated by making the following MD setting and then performing a
RESET:
MD37140 GANTRY_BREAK_UP = 1 (break up gantry grouping)
The gantry axes can then be traversed separately by hand; the monitoring of the warning and trip limits is not operative in
this state.
NOTICE
Mechanical coupling of gantry axes
If the gantry axes remain mechanically coupled, there is a risk of damage to the machine when the leading or synchronized
axes are traversed in this operating state!
7.3
Referencing and synchronizing gantry axes
7.3.1
Introduction
Misalignment after starting
Immediately after the machine is switched on, the leading and synchronized axes may not be ideally positioned in relation to
one another (e.g. misalignment of a gantry). Generally speaking, this misalignment is relatively small so that the gantry axes
can still be referenced.
In special cases (e.g. gantry axes were brought to a standstill because of a disturbance, power failure, or EMERGENCY
OFF), before the axes can be traversed the dimensional offset must be checked for permissible tolerance values and a
compensatory motion executed if necessary.

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English