ATI Q46D Dissolved Oxygen System Part 6 - Configuration
39
O&M Manual
Rev-N (4/21)
additional 3 minutes (HOLD time), retaining the original output signals.
Once the 3 minutes expire, the outputs will be released back to the
normal monitoring state. Then, the entire cycle will repeat –
approximately once per day.
Note: The sensor wash timer is not based on a “real-time” clock
circuit. Therefore, the time accuracy is only within about 10
minutes per day.
Note: A timer wash cycle can be manually started by pressing and
holding the ENTER key for a few seconds while viewing the timer
status screen in the MEAS menu. The timer must be in the “Tcyc”
state to allow a manual start. After this forced cycle, the system will
return to normal.
If the mode selection is changed while the sensor wash timer is in mid-
cycle (and the HOLD is enabled), the HOLD must be turned off manually
to return all of the outputs to normal operation. A flashing “T” will be
seen on the lower line of the display next to temperature while the probe
cleaner function is operating.
6.26 Diagnostics Menu [DIAG]
The diagnostics menu contains all of the user settings that are specific to the system diagnostic
functions, as well as functions that aid in troubleshooting application problems.
Set Hold The Set Hold function locks the current loop output values on the present
process value and holds relays in current status. This function can be
used prior to calibration, or when removing the sensor from the process,
to hold the output in a known state. Once HOLD is released, the outputs
return to their normal state of following the process input. The transfer
out of HOLD is bumpless on the both analog outputs - that is, the
transfer occurs in a smooth manner rather than as an abrupt change. An
icon on the display indicates the HOLD state, and the HOLD state is
retained even if power is cycled. Press ENTER to initiate user entry
mode, and entire value will flash. Use the UP arrow key to modify the
desired value, selections are ON for engaging the HOLD function, and
OFF to disengage the function. Press ENTER to store the new value.
The Set Hold function can also hold at an output value specified by the
user. To customize the hold value, first turn the HOLD function on.
Press the ESC key to go to the DIAG Menu and scroll to Sim Output
using the UP arrow key. Press ENTER. Follow the instructions under
Sim Output (see following page).
Fault List The Fault List screen is a read-only screen that allows the user to display
the cause of the highest priority failure. The screen indicates the number
of faults present in the system and a message detailing the highest
priority fault present. Note that some faults can result in multiple
displayed failures due to the high number of internal tests occurring. As
faults are corrected, they are immediately cleared.
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