HEIDENHAIN PT 855 for Turning - Manual (Page 58)

II - 1 Installation and Electrical Connection
60 Technical Information POSITIP 855
Grounding
X4
Connecting the encoders
POSITIP can be used with HEIDENHAIN linear encoders that pro-
vide sinusoidal output signals. The encoder inputs on the rear panel
are designated X1, X2, X3 and X4.
The connecting cable length may not exceed 30 m (100 ft).
Danger to internal components!
Do not engage or disengage any connections while
the unit is under power.
Pin layout for encoder inputs
Pin Assignment
1 0°+
2 0°–
3 +5 V (U
P
)
4 0 V (U
N
)
5 90°+
6 90°–
7 Reference mark signal RI+
8 Reference mark signal RI–
9 Internal shield
Housing External shield
2
3
4 5
7
1
9
6
8
Fig. 31: The ground screw on the rear panel
Noise immunity can be increased by connecting the
ground screw on the rear panel to the central ground
of the machine. Minimum cross-section of the
connecting wire: 6 mm
2 .
Fig. 32: Flange socket on POSITIP for encoder
signal input