Transducers For Tnc 151/Tnc; 2.3.1 Transducers For Tnc 151 B/Tnc 155 B, Tnc 151 Q/Tnc 155 Q - HEIDENHAIN TNC 151 Q Mounting Instructions

2.3 Transducers for TNC 151/TNC 155
2.3.1 Transducers for TNC 151 B/TNC 155 B, TNC 151 Q/TNC 155 Q
These control versions control the actual position with a digital step of 0.001 mm and subdivides the
signal cycle of the transducers by 20 x or IO x. Incremental linear transducers with a 20 pm or IO urn
grating pitch such as
.LS 107 (measuring lengths 240 mm to 3040 mm)
.LS 704 (measuring lengths 170 mm to 3040 mm)
.LS 403 or LS 404 (measuring lengths 70 mm to 1240 mm, up to 2040 mm with mounting spar)
.LID 300, LID 310
should therefore be used.
If accuracy requirements permit, measurement with e.g. rotary encoder type ROD 450 connected to the
drive spindle is possible. The required number of lines for the encoder is calculated as follows:
Line number / rev. = 50 x lead screw pitch (in mm) with 20 x evaluation (MP 12 - 15)
Line number / rev. = 100 x lead screw pitch (in mm) with 10 x evaluation (MP 12 -- 15)
For angle measurement (with axis IV) rotary encoder types ROD 250 and ROD 700 with 18,000
lines are available.
Please note:
If an ROD 450 rotary encoder is to be used in conjunction with a gear for angular positioning, the error
of the rotary encoder is decreased proportionally to the ratio of the gear.
The cable length between transducer and TNC-control must not exceed 20 m.
2.3.2 Transducers with distance-coded reference marks for TNC 151/TNC 155
When using linear transducers with distance-coded reference marks, the absolute position value can be
retrieved after a traverse of only 20 mm, i.e. after crossing two consecutive reference marks.
q ----
~----------------- --._ ___-~.------.--------.
Measuring principle
Dimensions in mm
The scale consists of a line grating with a 20 pm grating pitch and adjacent reference mark track. The spacing
between the reference marks varies by a definite amount. By evaluating the distance from one reference
mark to the next, the absolute position can be determined.
The following transducers are available with distance-coded reference marks:
.Sealed linear transducer LS 704 C
Measuring lengths 240 to 3040 mm
.Sealed linear transducer LS 107 C
Measuring lengths 240 to 3040 mm
.Sealed miniature linear transducer LS 403 C/LS 404 C
Measuring lengths 70 to 1240 mm (up to 2040 mm with additional mounting spar)
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