For a system
with a single I/O chassis, size the input power source according to the rating of the MicroNet Plus power
supply to which the source is connected. Do not size the supply mains for the sum of the MicroNet Plus
power supply ratings when redundant supplies are used. MicroNet Plus 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 4-3 gives the maximum overload
protection for supply mains connected to any single or redundant pair of MicroNet Plus main power
supplies. It is not recommended that both MicroNet Plus 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 Plus 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 4-3. and the power source must be
sized for the sum of the branches.

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.
In the event that on supply needs to be replaced, the recommended method for changing
Power Modules is with the power off (to the module being removed and the module being inserted).
The system will tolerate this “cold swap” method without failure.
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