Home (Orient) Switch Input; Buffered Encoder Output - Baldor 18H Series Installation & Operating Manual

Section 1
General Information

Home (Orient) Switch Input

Buffered Encoder Output

From
Processor
Terminal tightening torque is
7 lb–in (0.8 Nm) maximum.
3-32 Receiving & Installation
The Home or Orient function causes the motor shaft to rotate to a predefined home
position. The homing function allows shaft rotation in the drive forward direction only.
The home position is located when a machine mounted switch or the encoder "Index"
pulse is activated (closed). Home is defined by a rising signal edge at terminal J1-27.
The shaft will continue to rotate only in a "Drive Forward" direction for a user defined
offset value. The offset is programmed in the Level 2 Miscellaneous Homing Offset
parameter. The speed at which the motor will "Home" or orient is set with the Level 2
Miscellaneous Homing Speed parameter.
A machine mounted switch may be used to define the Home position in place of the
encoder index channel. A differential line driver output from a solid state switch is
preferred for best noise immunity. Connect this differential output to terminals J1-27 and
J1-28.
A single ended solid-state switch or limit switch should be wired as shown in Figure 3-18.
Regardless of the type of switch used, clean rising and falling edges at J1-27 are required
for accurate positioning.
Note: Control requires dynamic brake hardware for Orient (Homing) function to
work. Control will trip without dynamic brake hardware installed. Size A and B
controls ( "–E" suffix) are shipped with factory installed dynamic brake
hardware.
Figure 3-18 Typical Home or Orient Switch Connections
J1
+5V Input
Output
Common
5VDC Proximity Switch
Terminal Tightening Torque = 7 Lb-in. (0.8 Nm).
The control provides a buffered encoder output on pins J1-31 to J1-38 as shown in Figure
3-19. This output may be used by external hardware to monitor the encoder signals. It is
recommended that this output only drive one output circuit load.
Figure 3-19 Buffered Encoder Output
IN A
A
IN B
A
IN C
B
IN D
B
C
26LS31
C
D
D
E E
27 INDEX
INDEX
28
29 +5V
30
Common
Limit Switch (Closed at HOME).
J1
29
30
31
32
33
34
35
36
37
38
J1
27 INDEX
28 INDEX
+5V
29
30 Common
+5VDC
COMMON
A
A
B
Buffered
B
Encoder
INDEX
Output
INDEX
Not Used
COMMON
MN718