389D000 Rev B
9
Alarm Conditions
Any alarm condition indicates a potential hazardous condition that needs to be addressed immediately.
The alarms below are listed in order of precedence.
Sash Alarm
There are two safe sash levels defined for this cabinet, normal operating position and fully closed position. For
normal operation, the viewscreen sash must be placed at the safe design opening indicated by marker arrows on
both the right and left sash guide. The sash alarm occurs when the view screen is not at a safe operating
position, and alerts the user with a visual and audible alarm once per second. There is a 3 second delay before
the alarm activates, to allow the operator time to move between safe operating positions. Pressing the Alarm
Reset pushbutton will mute the audible alarm for 5 minutes. The visual alarm will continue to flash until the
viewscreen is placed at safe level. If the unsafe sash position is not corrected, the audible alarm will return.
Power/Processor Fault Alarm
The Power/Processor Fault Alarm occurs when the system experiences a power outage or the
microprocessor/controller has a fault. The indication of this fault is a visual and audible alarm of three, one
second alarms followed by a two second delay. This cycle is repeated until the alarm condition is cleared by
pressing the Alarm Reset pushbutton.
Double Proximity Sensor Fault Alarm
The Double Proximity Sensor Fault alarm occurs when both Sash Position proximity sensors are activated
simultaneously. This is a condition that should not be able to occur in normal operation. A visual and audible
alarm four times per second indicates this fault condition. This alarm can be muted for five minute periods by
pressing the Alarm Reset pushbutton.
Low-flow Exhaust Alarm
(with FlexAIR canopy exhaust connection only)
The
Low-flow alarm, (optional components required) occurs when there is a loss of capture air flowing into the
canopy air intake openings due to low exhaust air flow. A visual and audible alarm, twice per second, will alert
users of this undesirable operating condition. The Low-flow alarm can be muted, however a visual alarm will
remain until the problem is resolved. If the FlexAIR exhaust system has not been corrected, the audible alarm
will return.
Alarm Summary Table
Alarm Type
Acknowledgement
Comments
Action
Sash Alarm
Once per second after
three second delay
Takes precedence over other
alarms; audible alarm can be
muted for 5 minutes
Return sash to correct
position
Power/Processor Fault
Alarm
Three one second
alarms followed by two
second delay
Cycle will repeat until cleared
by pushing alarm reset button
Check power distribution
to cabinet
Double Proximity
Sensor Fault Alarm
Four times per second
Can be muted for 5 minutes
Return sash to one of the
two correct positions
Low-flow Exhaust
Alarm
Twice per second
Audible alarm can be muted
Check building exhaust
system
