For redundant operation, the control can use any combination of power supplies.
The power supplies can only be installed into slots PS1 (power supply #1) and PS2 (power supply #2).
If redundant power supplies are not needed, blanking plates must be installed in the slots not being used.
Branch circuit fuses, circuit breakers, and wiring must meet appropriate codes and authorities having
jurisdiction for the specific country (CE, UL, etc.). See Table 4-3 for maximum recommended fuse or
breaker ratings. Do not connect more than one main power supply to any one fuse or circuit breaker. Use
only the wire sizes specified in Table 4-3. which meet local code requirements. Time delay fuses or circuit
breakers must be used to prevent nuisance trips.
Power requirements depend on the number and type of modules supplied for each system. For a system
with a single I/O chassis, size the input power source according to the rating of the MicroNet power
supply to which the source is connected. Do not size the supply mains for the sum of the MicroNet power
supply ratings when redundant supplies are used. MicroNet supplies are redundant when installed in the
same chassis. Redundant supplies share the load between them equally, but each must provide for full
load in the event that one of the units is disabled. Table 4-4 gives the maximum overload protection for
supply mains connected to any single or redundant pair of MicroNet main power supplies. It is not
recommended that both MicroNet main power supplies of a redundant pair be connected to a single
source, since failure of that source would disable the system.
Multiple chassis systems using MicroNet power supplies may have power supplies of the same model,
but in different chassis, connected to the same source. In this case, each branch to a chassis must have
its own overcurrent protection sized according to Table 4-4, and the power source must be sized for the
sum of the branches.
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