A.O. Smith 3400 - Manual (Page 55)

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The date and time that each fault occurred is displayed in the
lockout history. The lockout timestamp displays in both the
lockout summary and detail information.
The Burner Control does not maintain date or time of day
information. The date and time stamp is assigned by the OI
display. When the OI display first obtains the lockout and alert
history from the control (during the display data synchronization),
no timestamps are assigned since the times that the lockouts
occurred are unknown. All new lockouts that occur after the
synchronization are assigned timestamps.
NOTE: The system time can be set in the OI display to ensure
that correct timestamps are given to the controls’ lockouts and
alerts. Power interruptions will require the time to be reset as the
display does not have a time backup means.
The Clear Lockout button allows the user to acknowledge and
clear (reset) the lockout when in lockout state, much the same
as pressing the reset button on the front of the Burner Control.
The user can toggle between displaying the controls’ lockout
history and alert log by pressing the Alerts or Lockouts button on
the bottom of the pages.
DATA COMMENT
Lockout time Set by display.
Fault Code Unique code defining which
lockout occurred.
Annunciator first out First interlock in limit string
results in a shutdown.
Description Fault description.
Burner Lockout/Hold Source/reason for lockout/
hold.
Burner control state
Sequence time
Burner control state timer at
time of fault.
Cycle Burner control cycle.
Run Hours Burner control hours.
I/O All digital I/O status at time of
fault.
Annunciator 1-8 states All annunciator I/O status at
time of fault.
Fault data Fault dependent data.
An alert log can be displayed for each control by pressing the Alert
button on the bottom of the history status page. A description of
the alert is displayed along with the time when the alert occurred
(refer to Table 20).
DATA COMMENT
Alert Line Set by display.
Alert Code Unique Code defining which
fault occurred.
Description Alert description.
HISTORY BUTTON
The History button on the Home page serves not only as a
button, but also displays Burner Control lockouts, holds, and
alerts as they occur. The History button can be selected at any
time, regardless of which type of information is displayed, to
view history information. Pressing the History button displays
a dialog box (see Figure 61) that allows the user to select the
type of history to view. The user can also silence an audible
alarm generated by the control during a lockout or alert by alarm
condition.
This History dialog box provides an exploded view of the status
information displayed in the History button (the font is larger).
One of the four buttons (OK, Lockouts, Alerts, or Silence) can
be selected. If none of these buttons are selected the dialog box
closes after 30 seconds.
Two types of historical data can be displayed on the history page:
lockout history and alert log.
The entire 15 fault code history is displayed in a scrollable list
with the most recent fault displayed first followed by the next
most recent fault. Summary information is displayed for each
fault entry, including the burner cycle count, fault code, and fault
number with description. Detailed information for a specific fault
entry that also includes burner control sequence state, burner
run-time hours, annunciation status, etc., is viewed by selecting
(touching the History line) the lockout entry in the list.
TABLE 19. BURNER CONTROL LOCKOUT HISTORY
TABLE 20. BURNER CONTROL ALERT LOG
FIGURE 61. EXAMPLE OF HYDRONIC HISTORY
FIGURE 62. EXAMPLE OF LOCKOUT HISTORY