Pro-face GP-4402WW, Hardware Manual

Page: 15 / 62

GP-4402WW/GP-4502WW Hardware Manual
15
Critical Systems, Alarms, and Handling Requirements
Critical alarm indicators and system functions require independent and redundant protection for
hardware and/or mechanical interlocks.
When you cycle power, wait at least 1 second before restoring the power to the panel after it has
been turned off. Switching the power OFF and ON quickly can damage the panel.
In the event the screen cannot be properly read, for example, if the backlight is not functioning, it
may be difficult or impossible to identify a function. Functions that may present a hazard if not
immediately executed, such as a fuel shut-off, must be provided independently of the panel. The
design of the control system of the machine must take into account the possibility of the backlight
no longer functioning and the operator being unable to control the machine or making mistakes in
the control of the machine.
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 thoroughly each implementation of the panel 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 this equipment as the only means of control for critical system functions such as
motor start/stop or power control.

Do not use this equipment 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.