5X00241G02 Emerson processor control card power module

Description

The Digital Input 5X00241G02 confifiguration contains 16 channels, where each channel has

voltage level sensing circuitry used to detect whether an input is on or off. The

Sequence of Events module has 16 isolated differential inputs to accommodate

separate external auxiliary supplies, or 16 single-ended (common return) digital

inputs with an on-card blown fuse detector to accommodate a common external

auxiliary supply for all channels. The 5X00241G02 selection of the Personality module

determines if the inputs are differential or single-ended. The input voltage level

monitored by the module is determined by the particular card group in the module.

The fifield side circuitry for the single-ended confifiguration is shown in Figure 20-1,

and the differential confifiguration in Figure 20-2. An input resistor provides the

normal mode surge 5X00241G02 protection and limits the current during normal operation. An

opto-isolator provides high dielectric isolation between the fifield side and the logic

or I/O bus side. The Single-Ended Digital Input confifiguration has a circuit used to

monitor the presence of the wetting supply. Two cases cause this monitor circuitry

to report a blown fuse status and issue an attention status to the Ovation Controller:

• Fuse is blown on the PDIA.
• Auxiliary supply level is lower than minimum On Input Voltage.

The Contact Input confifiguration 5X00241G02 provides 16 contact input current detecting

channels with common returns. The fifield side circuitry and terminal connections for

three of these channels are shown in Figure 20-3.

A +48V on-board power supply provides current limited contact wetting voltage if

the contact is open. If the contact closes, current is drawn from the +10V supply

which turns on the associated opto-isolator; thereby, relaying a closed contact state

to the I/O bus. The opto-isolators and the 5X00241G02 isolation provided by the 10V and 48 V

power supply provide high dielectric isolation between the fifield side and the logic

or I/O bus side.

There are two methods of wiring fifield devices to the termination block as shown in

Figure 20-3. Each fifield contact may 5X00241G02 have a separate input and return line as shown

for channel 1. Alternatively, fifield contacts wired to the same module may share a

return line as shown for channels 2 and 3. For either wiring method, do not tie the

contact return line to earth ground or a ground fault condition will occur as well as

a degradation of the common mode surge protection.

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