Pro-face PFXGM4201TAD Manual download pdf (Page 11)

General Overview

Critical systems, Detected Alarms and Handling Requirements

Critical detected alarm indicators and system functions require independent and

redundant protection hardware and/or mechanical interlocks.

If the unit for any reason becomes inoperative (for example, an inoperative

backlight) it may be difficult or impossible to identify a function. Functions that may

present a hazard if not immediately executed, such as emergency stop, must be

provided independently of the unit. The design of the control system must take into

account an inoperative unit (backlight) and that the operator is unable to control the

machine or respond to detected errors using the unit.

When the power is cycled, wait at least 10 seconds before restoring the power to the

GP Unit. Switching the power OFF and ON quickly can damage the unit.

WARNING

LOSS OF CONTROL

 Consider the potential failure modes of control paths in the machine control

system design, such as:

 The possibility of backlight failure,

 Unanticipated link transmission delays or failures,

 The operator being unable to control the machine,

 The operator making errors in the control of the machine.

 Provide a means to achieve a safe state during and after a path failure for critical

control functions such as emergency stop and overtravel stop.

 Provide separate or redundant control paths for critical control functions.

 Test individually and thorougly each implementation of the GP unit for correct

operation before service.

Failure to follow these instructions can result in death, serious injury, or

equipment damage.

WARNING

UNINTENDED EQUIPMENT OPERATION

 Do not use the unit as the only means of control for critical system functions

such as motor start/stop or power control.

 Do not use the unit as the only notification device for critical alarms, such as

device overheating or overcurrent.

Failure to follow these instructions can result in death, serious injury, or

equipment damage.

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Pro-face PFXGM4201TAD Manual Page 11