Publication 1747-UM011G-EN-P - June 2008
Grounded ac Power-Distribution System with Master-Control 
Relay
Power Supply Required InputVoltage Characteristics
•The applied input voltage must be at or below 132V ac RMS (265V ac 
RMS in 240 Volt mode).
•Minimum acceptable value of the applied input voltage must be above 
85V ac RMS (170V ac RMS in 240 Volt mode).
•The frequency of the applied voltage must be within 47...63 Hz.
•Both the positive and negative halfcycles must be symmetrical and 
conform to these requirements.
1
+–
Enclosure 
Wall
Connect when 
applicable
Suppressor
To Motor 
Starters
Back-panel 
Ground Bus
Step-down 
Transformer
Grounded Conductor
Equipment
Grounding 
Conductors
Start
Suppressor
MCR
MCR
FUSE
Multiple E-stop 
Switches
Controller 
Power Supply
Incoming 
ac
1FU
Grounding-electrode 
Conductor to 
Grounding-electrode 
System
L1
GND
N or L2
Suppressor
Input Module 
Wiring Arm
Output Module 
Wiring Arm
Output 
Actuator
Input 
Sensor
MCR
MCR
User dc 
Supply
The I/O circuits form a net 
inductive load switched 
by the MCR contacts. 
Therefore, a suppressor is 
needed across the line at 

1756-M08SE  1756-M08SE  1756-M08SE  
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the load side of the MCR 
contacts.
Disc.
2FU
3FU
L1
L2
L3
L1
L2
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