Redundant Power Supply Modules - Siemens SIMATIC S7-400 Reference Manual

3.2

Redundant power supply modules

Order numbers and function
Table 3-1 Redundant power supply modules
Type Order number
PS 407 10A R 6ES7407-0KR00-0AA0
PS 407 10A R 6ES7 407-0KR02-0AA0
PS 405 10A R 6ES7405-0KR00-0AA0
PS 405 10A R 6ES7 405-0KR02-0AA0
Redundant operation
Using two power supply modules of type PS 407 10A R or PS 405 10A R, you can design a
redundant power supply for a rack. We recommend this if you want to increase the availability
of your programmable controller, particularly if you are operating it on an unreliable power
system.
Designing a redundant power supply
Redundant operation is possible with any of the S7 CPUs and racks described in this manual.
STEP 7 as of V4.02 is also required.
To design a redundant power supply, insert a power supply module into slots 1 and 3 of the
rack. You can then insert as many modules as can be supplied by a single power supply
module. In other words, in redundant operation all the modules can only draw a total of 10 A.
Features
The redundant power supply of an S7-400 has the following characteristics:
● The power supply module features an inrush current in accordance with NAMUR.
● Each of the power supply modules can take over the supply of power to the whole rack if
the other one fails. There is no loss of operation.
● Each of the power supply modules can be exchanged while the system is in operation. No
loss of power and no peak stress occurs with the effective voltages when the modules are
removed or inserted.
● Each of the power supply modules monitors its function and sends a message if it fails.
● Neither of the power supply modules can generate an error which affects the output voltage
of the other power supply module.
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
Input voltage
85 to 264 VAC or 88 to
300 VDC
85 to 264 VAC or 88 to
300 VDC
19.2 to 72 VDC
19.2 to 72 VDC
Power supply modules
3.2 Redundant power supply modules
Output voltage See section
5 VDC/10 A and 3.8 (Page 60)
24 VDC/1 A
5 VDC/10 A and 3.9 (Page 63)
24 VDC/1 A
5 VDC/10 A and 3.14 (Page 74)
24 VDC/1 A
5 VDC/10 A and 3.15 (Page 76)
24 VDC/1 A
41