Siemens SINUMERIK 828D Turning Manual - Página 47
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4 Worth knowing
4.5
Example for converting a pulse number of an encoder
into a grating constant of a glass scale
Note
Because the rotary encoders are able to function, conversion with SW 4.8 is not
necessary.
Assumption 1
A rotary encoder with 2500 pulses/revolution mounted on a
ball screw with a 10 mm leadscrew pitch.
2500 pulses therefore correspond to 10 mm or 10000 µm.
10000 µm / 2500 pulses correspond to a distance of 4 µm per pulse. These 4 µm
are the calculated grating constant of a glass scale.
If the pulse number is twice this value, then the grating constant is half as large.
If the pitch of the ball screw is half as large, the grating constant is half as large.
Assumption 2
A rotary encoder with 1024 pulses/revolution is mounted on a ball screw with a
10 mm leadscrew pitch.
1024 pulses correspond to 10 mm or 10000 µm
10000 µm / 1024 pulses correspond to a distance of 9.765625 µm per pulse.
To avoid rounding errors when calculating the distance, use the encoder as rotary
encoder in the axis machine data and do not convert to a scale. Alarms are ruled
out because MD13060 = 6 hex.
Sollwertausgabe an analoge Antriebe
Entry ID: 109761423,
V1.0,
10/2018
47