Woodward LVDT - 12" Stroke Kit 8935-1223-30 VS-II Replacement Kit

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.

Not all systems will require the full load capability of the MicroNet 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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