SIEMENS
10/3
Siemens KT 10.1 · 2016
10
Add-on modules
Redundancy module
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Overview
The SITOP PSE202U redundancy modules are the optimal
extension for all 24 V power supplies to ensure additional
protection from failure of the 24 V supply. The redundancy
module continuously monitors the power supply units and, in the
event that one unit fails, the other unit automatically takes over
the 24 V power supply. Additionally, a signal is sent via a
signaling contact that can be evaluated by a controller, PC, or
control system.
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Benefits
•
High availability of the 24 V supply thanks to redundant config-
uration
•
Power is reliably supplied even when a power supply fails
•
Compact redundancy modules for power supply units up to
40 A
•
Redundancy module 24 V/NEC Class 2 with limiting to 100 VA
•
Diagnostic signal via LED and signaling contacts
•
Adjustable switching threshold for LED and signaling contacts
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Application
The redundancy module decouples two 24 V power supplies of
the same type so that the loads are still supplied by the second
power supply (1 + 1 redundancy) in case one of the two power
supplies fails.
Redundancy modules support parallel switching of power
supplies of the same type to increase performance while offering
redundancy at the same time (N + 1 redundancy).
You can use the NEC Class 2 redundancy module to implement
a redundant 24 V supply limited to an output power of 100 VA.
■
Design
For redundant configuration of a 24 V supply, the redundancy
module decouples two SITOP 24 V power supplies of the same
type by means of diodes in parallel operation. Depending on the
output current of the power supplies, 1 to 2 redundancy modules
may be required.
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Function
Monitoring
The redundancy module continuously monitors the output volt-
age of the connected power supplies. The switching threshold
of 20 to 25 V can be set on the device. A signal indicates if the
output voltage of one of the two power supplies sinks to the set
value or below.
Signaling
The LED on the device and a changeover contact signal a faulty
power supply.
Power
supply unit
Redundancy
module
Power
supply unit
24 V DC
G_KT01_XX_00121
© Siemens AG 2016