Incremental Encoder Interface - Baldor MotiFlex e100 Installation Manual

4.1.1 Incremental encoder interface

The incremental encoder connections (ABZ channels and Hall signals) are made using the
15-pin D-type female connector X8. The encoder inputs (CHA, CHB and CHZ) accept differential
signals only. Twisted pairs must be used for each complementary signal pair e.g. CHA+ and
CHA-. The Hall inputs may be used as differential inputs (recommended for improved noise
immunity) or single ended inputs. When used as single ended inputs, leave the Hall U-, Hall V-
and Hall W- pins unconnected. The overall cable shield (screen) must be connected to the
metallic shell of the D-type connector. Connector X8 includes a 'Sense' pin, which is used to
detect the voltage drop on long cable runs. This allows the MotiFlex e100 to increase the encoder
supply voltage on pin 12 to maintain a 5 VDC supply at the encoder (200 mA max).
1
9
15
8
MotiFlex e100
CHA+ 1
CHA- 9
Figure 26 - Encoder channel input circuit - Channel A shown
4-2 Feedback
Pin Incremental encoder function
1 CHA+
2 CHB+
3 CHZ+
4 Sense
5 Hall U-
6 Hall U+
7 Hall V-
8 Hall V+
9 CHA-
10 CHB-
11 CHZ-
12 +5V out
13 DGND
14 Hall W-
15 Hall W+
1nF
1nF
DGND
to encoder signal loss detection
120R
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MAX3096
Differential to CPU
line receiver
MN1943