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Considering the cost of spare parts, a uniform type of power supply unit (25 A) is sometimes
profitable.
At redundancy, the number of units extracted from the information in Table 3-2 is doubled.
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As a rule, an SA168 (25 A d.c.) supply unit is used to supply equipment with one I/O subrack.
If the Advant Controller 450 has another I/O subrack, it is equipped with another SA162 (10 A
d.c.) in cabinet 2. If the system has three I/O subracks, the extra supply unit is replaced by an
SA168. Please note that the supply unit types given are for 230 V a.c. mains supply.
Corresponding types for 120 V a.c. mains supply are available.
The current consumption with 24 V is obtained in the following way:
where I
24V
= current consumption 24 V, obtained from Table E-1 - E-3 in
Appendix E, Current Consumption and Heat Dissipation.
I
5V
= current consumption 5 V, obtained from Table E-1 - E-3 in
Appendix E, Current Consumption and Heat Dissipation
0.37= conversion factor.
This current is used as output current for analog outputs in addition to supplying the internal
electronics.
See Table E-1 - E-3 in Appendix E, Current Consumption and Heat Dissipation for information
about the current consumption of the available units in Advant Controller 450. These tables hold
typical data relevant to the actual type of calculation. It also holds power dissipation data to be
used in calculating the heat generated in a cabinet. You can use the tables as a form when you
make your own calculation.
The total static and dynamic loads may under no circumstances exceed 100 % of the capacity of
the supply unit. As all current consumption information is typical and not an “absolute
maximum,” it is recommended that you not load the supply unit beyond 90 % of its capacity,
including all static and dynamic loads.
When calculating the current supplied to SA162/168 units, use 0.85 as the efficiency factor of
the units.
Controller subrack
I/O 1 subrack
25 A
I/O 2 subrack
I/O 3 subrack
25 A
I/O 4 subrack
I/O 5 subrack
25 A
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