Emerson 5X00300G02 Westinghouse power card controller communication card

Description

Ground fault detection 5X00300G02 circuitry on the Sequence of Events module with Contact

Inputs activates when the input or return line for any channel fifinds a low impedance

(<10K ohms) path to earth ground. A single wire 5X00300G02 with a ground fault will not cause

an error in the point data, but multiple ground faults (if they include input and return

lines) could cause faulty data (that is, channels appearing as if their contacts are

closed when they are really open).

When a ground fault occurs, the external error LED lights, and the GND Fault bit

11 in the Status Register is set. If the 5X00300G02 GND Fault Attention Enable bit 8 is set in the

Confifiguration Register, a ground fault is seen as a catastrophic error causing an

attention status to be sent back to the Controller. See Figure 20-3 for ground fault

detection circuitry

The following defifinitions apply to the 5X00300G02 restrictions listed below:

— Rshunt = contact shunt resistance

— Rcontact = resistance associated with a closed contact

— Rreturn = resistance of the common return line

— Rline = resistance of the non-common cable length to and from the contact

— Rwiring = Rcontact + Rline + 16Rreturn

— Rfault = resistance from either line to ground which causes a ground fault

Figure 20-4 shows possible cable 5X00300G02 resistances that affect contact input performance.

The following restrictions apply:

• Under no-ground-fault conditions or if the channel return (low) line has a

ground fault:

— Rshunt across contact must be ≥ 10k ohms to always recognize an open

contact as open.

— Rshunt across contact must be ≥ 50k ohms to maintain the high level contact

wetting voltage.

• If the input connection 5X00300G02 from a channel has a ground fault with the contact open:

— Rshunt across contact must be ≥ 150k ohms to guarantee ground fault is

detected.

• For a ground fault on the input or return connection to a channel:

— Rfault from either line to ground must be ≤ 5K ohms to guarantee detection

of the ground fault.

• With or without ground fault conditions:

— Rwiring through fifield wiring to contact must by < 100 ohms to always

recognize a closed contact as closed.

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