28
Rockwell Automation Publication 1606-RM109A-EN-P - August 2020
Power Supply —12V, 10 A, 120 W, Single Phase
N+1 Redundancy
Redundant systems for a higher power demand are usually built in a N+1
method. For example, four devices, each rated for 10 A are paralleled to build a
30 A redundant system. Leakage current, EMI, inrush current, harmonics will
increase when using multiple devices.
Keep an installation clearance of 15mm (left / right) between two devices and
avoid installing the devices on top of each other.
Do not use devices in parallel in mounting orientations other than the
standard mounting orientation or in any other condition, where a reduction of
the output current is required.
For N+1 redundancy the ambient temperature is not allowed to exceed
40 °C (104 °F).
Wiring Examples
Figure 33 - 1+1 Redundant Configuration for 10 A Load
Current with a Dual Redundancy Module
Figure 34 - N+1 Redundant Configuration for 30 A Load Current with Multiple Power
Supplies and Redundancy Modules
L
N
PE
10 A
Load
Failure
Monitor
I
Redundancy
Module
Output
Input
1
Input
2
+
+
-
-
+
-
op
ti
onal
Power
Supply
12V, 10 A
DC
OK
+ +
ȿ
L N PE
Output
Input
o
o
Power
Supply
12V, 10 A
DC
OK
+ +
ȿ
L N PE
Output
Input
o
o
I
30 A
Load
Failure
Monitor
I
Redundancy
Module
Output
Input
1
Input
2
+
+
-
-
+
-
L
N
PE
op
ti
onal
Power
Supply
12V, 10 A
DC
OK
+ +
ȿ
L N PE
Output
Input
o
o
Power
Supply
12V, 10 A
DC
OK
+ +
ȿ
L N PE
Output
Input
o
o
I
Redundancy
Module
Output
Input
1
Input
2
+
+
-
-
+
-
Power
Supply
12V, 10 A
DC
OK
+ +
ȿ
L N PE
Output
Input
o
o
Power
Supply
12V, 10 A
DC
OK
+ +
ȿ
L N PE
Output
Input
o
o
I
I
