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Common to all alternatives is an optional connection to a separate single-phase a.c. mains
supply C. This network C feeds modems, which use a.c. power supply and a specific backup
power supply SB510. The latter solution provides the feature to maintain battery charging and
supply of the RAM while the power supply is otherwise switched off.
The uppercase A, B and C identify the mains supply in the documentation. They refer to mains
supply with different requirements. Networks A and B are low-quality networks and they are
redundant to each other. Network C is a high-quality network.
You can get more information on the planning viewpoint in Chapter 2, Installation,
Section 2.1.7, Power Supply and Fusing.
The one-line diagram, Figure 1-12, shows the power supply in cabinets with a controller
subrack and three I/O subracks. Figure 1-13 shows an alternative with redundancy. Supply from
a.c. mains supply, including use of the optional mains supply C, is illustrated.
A d.c. alternative only differs in the use of alternative power supply units.
Depending on differing needs for circuit breaker capacity, there are different types of power
switch and distribution units (SX5xx) specified to the individual installations. See the delivery
documentation.
CE-marked equipment is provided with net filter at the enclosure port. These are not shown in
the one-line diagram.
Detailed information on, for example, terminal block dispositions, locations, connections
between units, and so on, is also given in a circuit diagram enclosed with the controller’s
delivery documentation.
The main functions in the power supply system are briefly described below. In addition, you can
find more detailed hardware descriptions in Appendix A, Hardware Modules of this manual and
in the 6,2+DUGZDUH5HIHUHQFH0DQXDO
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