Eaton Electrical D77A - Manual (Page 45)

Intelligent Technologies ( IT.) D77A I/O Module Products
MN05002001E For more information visit: www.EatonElectrical.com 37
AC Inputs
AC power is typically used to energize loads related to machinery function such as solenoid valves and motor starters. The same AC
power source is often used as signal power for inputs as illustrated in Figure 35. The input devices to which AC inputs are wired are
typically two-lead devices like push buttons, limit switches and selector switches. One side of the input device is wired to an AC power
source while the other is wired to the input terminal. Another input terminal is wired to a grounded neutral wire. Refer to AC Output
Module Specifications on page 13 for module details.
Figure 35: AC Input Wiring
a) Three-phase Motor Circuits
b) First Point of Input Module
c) Second Point of Module
d) Selector Switch
e) Push Button
f) Limit Switch
g) Control Transformer
f
g
a
b
c
d
e
L1 1FU
L2
X1 X2
0
C0
C1
1
2
3
2FU
L3
10FU
L1 L2
N/C
3FU
H1 H4 H3 H2
JIC-0002