Start-Up
SINUMERIK 801 2-33
Start-Up
Single-switch mode (without reference cam, MD34000=0)：
There is one BERO in the axis.
Machine body
Leadscrew
Bero
Object under test
Signal output to X20
Fig. 2-26 Configuration 2 for reference point approaching: single-switch mode
With this mode, only one speed for referece point approaching can be set.
Precision of reference point approach is relevant to the quality of BERO and
the speed set for approaching reference points.
BERO sampling methods
No matter which configuration is taken, the control system can use two ways
to sample BERO when approaching the reference point:
1) Sample the rising edge of BERO and take the effective level of the rising
edge as the reference mark;
2) Move the axis onwards, record the distance traversed after this
reference mark and sample the falling edge of BERO. After samping the
falling edge, the control system will auto-calculate the middle point
between both edges and use this point as the reference point for the
axis.
t
Threshold Level
Rising Edge Falling Edge
Ref. Point
V
V
t
Threshold Level
Threshold Level
Falling Edge
Ref. Point
Fig. 2-27 BERO sampling methods
Mechanical installation of the proximity switches
Follow Fig. 2-28 & 2-29 to complete the mechanical installation of BERO under
double-switch mode.
z When stepper motors is connected with a leadscrew directly:
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