December 2001 Encoders 3 – 31
3.5 Encoders
3.5.1 Prerequisites
HEIDENHAIN contouring controls are designed for use with incremental linear
and angular encoders as measuring systems. The 1 V
PP
and 11 µA
PP
signals
are interpolated by a factor of 1024.
Encoders with one or more reference marks are permissible. HEIDENHAIN
recommends the use of encoders with distance-coded reference marks
because they greatly reduce the traverse distance required to establish the
absolute position.
In addition, depending on the LE, encoders with EnDat interface can be
connected:
n LE 426 M, LE 430 M with EPROMs: only certain inputs
n LE 426 M, LE 430 M with flash EPROMs:
all speed encoder inputs, 6 position encoder inputs
Please use only HEIDENHAIN encoder cables, connectors and couplings. For
maximum cable lengths, see “Cable Overview” at the end of this chapter.
Current
consumption of
encoders
Maximum current consumption:
n 200 mA per speed encoder input
n 100 mA per position encoder input
n 300 mA per EnDat encoder input
3.5.2 Position Encoder
LEs with power
inputs (11 µA
PP
)
Input Id. Nr. of LEs with 11-µA
PP
input Max. input
frequency
LE 426 PB
311 999-xx, 313 526-xx, 317 349-xx, 318 177-xx 50 kHz
LE 426 CB
312 002-xx, 313 525-xx 50 kHz
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