HEIDENHAIN PT 855 for Milling - Manual (Page 86)

II - 1 Installation and Electrical Connection
84 Technical Information POSITIP 855
Fig. 33: The ground screw on the rear panel
Grounding
Noise immunity can be increased by connecting the
ground screw on the rear panel to the star point of
machine ground. Minimum cross section of the
connecting wire: 6 mm 2 .
X4
Interfaces X1, X2, X3 and X4 comply with the recommen-
dations in EN 50 178 for separation from line power.
Connecting the encoders
POSITIP can be used with HEIDENHAIN linear and angle encoders
that provide sinusoidal output signals. The encoder inputs on the
rear panel are designated X1, X2, X3 and X4. The connecting
cable may not exceed 30 m (100 ft) in length.
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
The encoder inputs are permanently assigned to 4 axes.
Operating parameter P49.* determines the designation of the
axes, e.g. axis 1 = X axis, axis 2 = Y axis.
Axis Encoder input
1 X1
2 X2
3 X3
4 X4
2
3
4 5
7
1
9
6
8
Fig. 34: Flange socket on POSITIP for encoder
signal input
X3 X2 X1 X4
Fig. 35: Encoder inputs on rear panel