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RMC100 and RMCWin User Manual
6-48
6.4.2 Stepper Wiring
Use shielded twisted pairs for all connections to inputs and outputs. Route the quadrature
encoder wiring separate from other wiring. You must provide the power supplies needed by your
quadrature encoders and drives, although the RMC can provide +5 VDC for the optoisolators on
the drive module as shown in the Stepper Output Wiring section below.
DB25S Pin-out
Pin
Function
Pin
Function
1
A-
14
Index (Z)-
2
A+
15
Index (Z)+
3
B-
16
Encoder
Common
4
B+
17
N/C
5
N/C
18
Home-
6
Retract
Lim-
19
Home+
7
Retract
Lim+
20
Fault-
8
Extend
Lim-
21
Fault+
9
Extend
Lim+
22*
Step-
10*
Vcc Out
23*
Step+
11*
Direction-
24*
Drive
Enable-
12*
Direction+
25*
Drive
Enable+
13*
Drive
Common
*Outputs, all others are inputs
See also General Wiring Information.
Stepper Output Wiring
Note: Do not use Vcc Out to power your encoder because:
- This output’s voltage is not regulated.
- 50 mA is not adequate current to power the encoder. Each of the encoder outputs (A, B, and Z)
requires 20 to 25 mA in addition to the current used by the encoder’s internal circuit.
- Using this output to power the encoder would violate the isolation that exists between the
inputs and outputs.
Note: The STEP and DIR outputs are generated by a differential driver, but the ENABLE output
is a relay. Therefore, power must be provided through the ENABLE output, as shown in the
diagrams below.
Drive with bipolar inputs:
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