Woodward VXXRV-2515-MUEXM-X-S-X 9907-2147 POWER CYLINDER

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. 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.

Not all systems will require the full load capability of the MicroNet Plus power supply. If not otherwise

indicated on a cabinet system nameplate, either use the MicroNet power supply input ratings for sizing

the system’s source or consult Woodward for determining the minimum source requirements.

Module Description

The MicroNet expansion chassis may use either single or redundant power supplies. A motherboard

located on the back of the chassis allows the two power supplies to form a redundant power system

providing two separately regulated, 24 Vdc, 12 A outputs; two separately regulated, 5 Vdc, 20 A outputs;

and two separately regulated, 5 Vdc precharge outputs to the control. Power output regulation, including

line, load, and temperature effects, is less than ±5%.

POWER SUPPLY FAULT LED

—This red LED turns on when one of the supply’s three power converters

has shut down or one or more of the supply levels is below internally specified levels.

If this LED is on,check for a short circuit on external devices connected to the control’s power supply.

When redundant power supplies are running, current sharing circuitry balances the load to reduce heat

and improve the reliability of the power supplies.

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