ABB MTAC-01, User Manual

Page: 18 / 28

18
Installation
Open collector (sinking) encoder output
Diagram assumes normal pulse order in Forward
rotation: Pulse A/1 leads as diagrammed on the
right.
For encoders with pulse B/2 leading, change the diagram for these
connections:
• Encoder A/1 and B/2 should be wired to MTAC terminals B and A,
respectively.
A/1
B/2
1
0
0V V
CC
2
SCR
1)
A
A
B
B
Z
Z
MTAC-01 module
1) Connect the cable shield at the encoder housing, if, and only if, the encoder is
isolated from the motor, and from the ground.
2) Three identical resistors whose size depends on the encoder power supply
V
in
= V
out
:
V
in
= 30 V: R
L
= 2.7…3.0 kohm, 0.5 W
V
in
= 24 V: R
L
= 1.8…2.2 kohm, 0.5 W
V
in
= 15 V: R
L
= 1.0…1.5 kohm, 0.5 W
V
in
= 5 V: R
L
= 390…470 ohm, 0.125 W
Encoder
power
supply
SCR
V
in
GND
V
out
GND
SCR
Encoder
R
L
2)