Speed/Torque; Clamping System - Siemens SINUMERIK 828D Commissioning Manual

Spindle function
8.4 Spindle diagnostics
8.4.6

Speed/torque

To check the loads on the spindle, the speed and the torque are recorded in a histogram as
a function of the operating hours. The color coding indicates the following states:
● Light green: low load
● Green: rated load
● Yellow: high load
● Orange: critical load
The heights of the individual bars correspond to the percentage time shares (dwell time) in
relation to the operating hours under speed. The accumulated number of operating hours under
speed for the spindle are shown above or below the respective bar for the corresponding speed
or torque range. The width of the bar corresponds to the evaluated speed or torque range.
Possible conclusions
● The speed histogram is an indication of the load on the bearings and rotary gland caused
by the speed.
● The speed histogram is an indication of the load on the bearings caused by the stock
removal forces. The relationship between torque and radial force changes depending on
the tool diameter (lever arm), the milling arc (superimposition of the cutting forces of the
individual cutting edges) and the cutting force coefficients (the stock removal force consists
of cutting force, feedrate force and passive force - only the cutting force is acquired via the
torque).
8.4.7

Clamping system

The diagnosis of the clamping system offers the following capabilities:
● Fast and robust detection of the clamping states.
● Monitoring of the clamping task and the clamping system.
● Sensors S1 and S4 in the spindle provide information about the clamping device.
● Sensor S5 detects a position, e.g. the defined rotatory angular position of the shaft.
Clamping states
The preset limits for the three clamping states are displayed in the upper section of the window.
The clamping state is defined for the specified voltage range of the analog output signal of
sensor S1.
The values in the "Voltage min." and "Voltage max." columns indicate in which voltage range
the analog signal of sensor S1 must lie for the corresponding clamping state.
The preset speed limitation "Speed max." specifies the maximum permissible speed for the
clamping state and is limited to this by the drive.
Signal overview
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Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3
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