Woodward ProTech-GII - Bulkhead Mount, HV/HV, Independent Relays 8237-2595

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.

Input Power Wiring

MicroNet controls require a fixed wiring installation for ac applications. Ground leakage exceeds 3.5 mA

AC. Maximum ground leakage for ac installations is 7.2 mA at 60 Hz. A ground conductor connected to

the chassis is required for safety. The power supply grounding terminal(s) should also be connected to

earth to ensure grounding of the power supply printed circuit boards. The grounding conductor must be

the same size as the main supply conductors.