Baldor MicroFlex e100, Installation Manual

Page: 42 / 172

www.baldormotion.com
4-2 Feedback MN1942
4.1.1 Incremental encoder feedback
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 MicroFlex
e
100 to increase the
encoder supply voltage on pin 12 to maintain a 5 V supply at the encoder (200 mA max).
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 +5 V out
13 DGND
14 Hall W
-
15 Hall W+
CHA-
CHA+
MicroFlex
e
100
MAX3096
Differential
line receiver
to CPU
120R
to encoder signal loss detection
DGND
1
9
Figure 12 - Encoder channel input circuit - Channel A shown
1
8
9
15