Woodward 8928-7541 Large Engine Control Module (LECM)

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.

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 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. 

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.

Each main power supply has four LEDs to indicate power supply health (OK, Input Fault,

Overtemperature, and Power Supply Fault).