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E166703
10-9
10: Using the Optional Display
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Critical systems, Detected Alarms and Handling Requirements
Critical detected alarm indicators require independent and redundant protection hard-
ware and/or mechanical interlocks. If the display unit for any reason becomes inoper-
ative (for example, an inoperative backlight) it may be difficult or impossible to
identify an alarm condition. Alarms tied to critical functions, such as emergency stop,
must be provided independently of the display unit. The design of the control system
must take into account an inoperative unit (backlight) and that the operator is unable
to view alarms using the display 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 alarm notification, such as:
• The possibility of backlight failure
• Unanticipated link transmission delays or failures
• The operator being unable to operate the display correctly
• Provide a means to achieve a safe state during and after a path failure for critical
alarms.
• Provide separate or redundant control paths for critical alarms.
• Test individually and thoroughly each implementation of the display unit for correct
operation before service.
Failure to follow these instructions can result in serious injury or equipment
damage.
WARNING! UNINTENDED EQUIPMENT OPERATION
Do not use the unit as the only notification device for critical alarms,
such as device overheating or over-current.
Failure to follow this instruction can result in death, serious injury, or equip-
ment damage.