Ametek 1995L Micro-Set PLS Manual de usuario descargar pdf (Pagina 19)

Installation and Maintenance Manual

Chapter 5: Fault Check

The Fault Check option provides an automatic in-process self-diagnostic mechanism to verify that all

PLS functions are operating properly.

The Fault Check option will detect and disable system operation in the event of any of the following

problems:

1. Analog to digital converter or associated electronic failure.

2. Microprocessor or 5 volt power supply failure.

Non-system-type faults, such as individual output failures, will not be sensed. It is recommended that

the Fault Check output be used as an operate enable type signal. Loss of this output should immedi-

ately stop the process which is being controlled.

The Fault Check input may be operated by an isolated contact, current sourcing, or current sinking

device 5V DC at 10mA.

A normally closed, momentary open contact button can be wired per Fig 10-1, Fig. 10-2, OR

Fig. 10-3 (Chapter 10: Wiring Diagrams), to activate the Fault Check circuit, and it will provide a

method of resetting the fault output after a fault condition has been sensed.

To reset the Fault Check output after the fault condition has been cleared, the fault reset input must be

deactivated (open circuit) and then re-actuated. Cycling the fault reset input will cycle the fault check

relay to verity that the Fault Check output is operating properly.

NOTE: If the Fault Check inputs are not wired, the display will still show when there is a fault and the

outputs will be disabled, but it will not lock on the fault. However, if the fault check inputs are

wired up per Fig. 10-1, Fig. 10-2 or Fig. 10-3 (Chapter 10: Wiring Diagrams), upon seeing

a fault, the fault check relay will drop out and all outputs will shut off until the fault is fixed and

the fault check input is reset.

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Ametek 1995L Micro-Set PLS Manual de usuario Pagina 19