Reference / Synchronize - Siemens SINUMERIK 840D sl Function Manual

S1: Spindles

16.3 Reference / synchronize

16.3 Reference / synchronize
Why synchronize?
In order to ensure that the controller detects the exact position of the spindle when it is switched
on, the controller must be synchronized with the position measuring system of the spindle.
The following functions are possible only with a synchronized spindle:
● Thread cutting
● Tapping without compensating chuck
● Axis programming
For further explanations about synchronization of the spindle, see Section "R1: Referencing
(Page 1149)".
Why reference?
In order to ensure that the controller detects the exact machine zero when it is switched on,
the controller must be synchronized with the position measurement system of the rotary axis.
This process is known as referencing. The sequence of operations required to reference an
axis is known as search for reference.
Only a referenced axis can approach a programmed position accurately on the machine.
For further explanations about referencing the rotary axis, see Section "R1: Referencing
(Page 1149)".
Installation position of the position measurement system
The position measurement systems can be installed as follows:
● Directly on the motor in combination with a Bero proximity switch on the spindle as a zero-
mark encoder
● On the motor via a measuring gearbox in combination with a Bero proximity switch on the
spindle as a zero-mark encoder
● Directly on the spindle
● On the spindle via a measuring gearbox in combination with a Bero proximity switch on the
spindle as a zero-mark encoder (only with ratios not equal to 1:1)
Where two position measuring systems are provided, they can be installed either in the same
location or separately.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions