Siemens SINUMERIK 808D Function Manual

Function Manual
162 01/2017
Sequence
The spindle travels to the programmed end point optimally in terms of time. Depending on the appropriate secondary
conditions, the operational sequences in phases 1 - 2 - 3 - 4 or 1 - 3a - 4a are executed.
Phase 1:
SPOS will switch the spindle to position control mode. The acceleration from
MD35210 GEAR_STEP_POSCTRL_ACCEL (acceleration in the position control mode) is activated. The direction of rotation
is determined by the relevant distance-to-go (type of path setting with SPOS).
The speed entered in MD35300 SPIND_POSCTRL_VELO (position control activation speed) is not exceeded. The
traversing path to the end point is calculated. If the end point can be accessed immediately from this phase, Phase 3a, 4a
continues instead of Phase 2.
Phase 2:
Acceleration has been performed up to the speed set in MD35300 SPIND_POSCTRL_VELO (position control
activation speed). The brake application point calculation identifies when the programmed spindle position (SPOS=...) can
be approached with the acceleration defined in MD35210 GEAR_STEP_POSCTRL_ACCEL.
Phase 3 and Phase 4:
The sequence for "Deceleration" and "Position reached" is the same as for non-synchronized
spindles.
Spindle reset
The positioning process can be aborted with the IS "Delete distance-to-go/spindle reset" (DB380x.DBX0002.2). However,
the spindle remains in positioning mode.
Notes
● In positioning mode the spindle speed override switch continues to be valid.
● Positioning (SPOS) is cancelled with "Reset" or "NC stop".
17.3
Synchronization
Why synchronize?
The control must be synchronized with the position measurement system on the spindle so that the control knows the exact
0 degree position when switched on. Only a synchronized spindle is capable of thread cutting or positioning.
For axes, this process is referred to as referencing, see Chapter "Reference point approach (R1) (Page 150)".
Installation position of the position measurement system
● Directly on the motor in combination with a BERO proximity switch on the spindle (zero mark encoder)
● Directly on the spindle
● Above the measuring gearbox plus BERO switch on the spindle.
Synchronization possibilities
When the spindle is switched on, the spindle can be synchronized as follows:
● The spindle is started with a spindle speed (S function) and a spindle rotation (M3 or M4), and synchronized with the next
zero mark of the position measurement system or with the BERO signal. The 0 degree position is shifted by MD34080
REFP_MOVE_DIST + MD34090 REFP_MOVE_DIST_CORR - MD34100 REFP_SET_POS.
Note
Only use MD34080 for shifting the 0 degr
ee position. Monitoring with MD34060 REFP_MAX_MARKER_DIST should be
set to two spindle revolutions (720 degrees).
● Programming SPOS=... from various states (refer to Section "Spindle positioning mode (Page 160)")
● In "JOG" mode, the spindle is started in speed control mode with the direction keys and synchronizes with the next zero
mark of the position measurement system or the BERO signal.
Value acceptance
When synchronizing the spindle, the associated reference point from MD34100 REFP_SET_POS[0] (default value = 0) is
transferred and a possible shift of the reference point. These shifts (machine data) act irrespective of the connected
measurement system and are described in Chapter "Reference point approach (R1) (Page 150)".

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English