Power Supply PS1000-A6-24.20.R
Application Notes
20
21
-1
1
43
25.7
Parallel Use for Redundancy
Devices can be paralleled for redundancy to gain higher system availability. The unit is already
equipped with a MOSFET as decoupling device on the output to avoid, that a faulty unit
becomes a load for the other power supplies and the output voltage cannot be maintained
any more.
Recommendations for building redundant power systems:
•
Use separate input fuses for each power supply.
•
Monitor the individual power supply units by utilizing the built-in DC-OK relay contacts
on each power supply.
Figure 25.10 Wiring diagram, 1+1 Redundancy for 20A output current
Figure 25.11 Wiring diagram, N+1 Redundancy for 40A output current
24V, 20A
Load
L
N
PE
Failure
Monitor
I
I
L N PE
+
-
Power Supply
DC-OK
DC-
OK
Output 24V 20A
Input
L N PE
+
-
Power Supply
DC-OK
DC-
OK
Output 24V 20A
Input
24V, 40A
Load
L
N
PE
Failure
Monitor
L N PE
+
-
Power Supply
DC-OK
DC-
OK
Output 24V 20A
Input
I
I
I
L N PE
+
-
Power Supply
DC-OK
DC-
OK
Output 24V 20A
Input
L N PE
+
-
Power Supply
DC-OK
DC-
OK
Output 24V 20A
Input
Note
•
Observe the temperature derating requirements of Figure 25.8 and Figure 25.9
for N+1 redundancy applications.
•
Use separate mains systems for each power supply whenever it is possible.
