JOHNSON CONTROLS
50
FORM 100.50-NOM7 (808)
Menu Navigation and Display Descriptions
*** HISTORY 01 ***
Comp Safety L/O
TROUBLE - ACTIVE
06-Mar-2000 02:10:AM
“HISTORY” NAVIGATION
The History function group will display unit error his-
tories and will be used to troubleshoot and diagnose
equipment problems and/or failures (faults). The dis-
play items for the History function group are arranged
dierently than the other function groups. The History
function group contains twelve (12) History items. Each
History item has a description of the problem as well as
a list of the unit operating parameters (snap shot data)
when the problem occurred.
Pressing the History key will move the display to the
rst History item in the History function group. The
display will show *** HISTORY XX *** on the top
line of the display. XX refers to a number 1 through 12
to list the number of the fault in the memory buer.
History Displays
Line 2 Fault Description (Fault Name)
Line 3 Priority – Status (Alarm, Trouble, None) –
(Clear, Active)
Line 4 Date/Time (Fault Occurred)
Pressing the Back (<) and Next (>) keys will navigate
the display between the twelve History items.
Table 5 shows a list of possible system faults along with
the classication of the fault (illustrated in the display
line 2). Display Line 3 display shows the following (see
Service section for fault response details):
• None - No fault is recorder for History XX.
• Alarm - A fault has been detected that results in the
unit shutting down.
• Trouble - A fault has been detected that does not
result in the unit shutting down.
• Clear - One of the following conditions has oc-
curred:
• A fault has been detected on an enabled sensor
failed and the sensor has since been disabled.
• A fault has been detected and the cause of the
fault has ceased to be present.
• The operator has taken an action, such as cycling
the controller power.
• Active - The fault is still current.
Each History fault display will have a point’s data list
associated with it. This point’s data list will contain a
snapshot of the operating parameters the instant the
fault occurred. Once a fault is selected, the points data
list can be accessed by using the Up (↑) and Down (↓)
arrow keys. This will scroll through the points data list
in Table 6.
The History function group will show faults in order,
starting with the most recent. History 01 will be the
most recent fault. No fault History is eliminated once
recorded other than being “pushed o” of the end of
the list by a new fault.
When a fault is written into the fault History list, the
Alarm LED will be turned on next to the display. The
System Alarm LED will remain on as long as an Active
fault is present in the History list.
Refer to the Service Section fault response details.
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