ATI
Model Q45CT Portable Transmitter
Part 4
– Configuration
24
O&M Manual
Rev-G (7/15)
4.11 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. 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.
Note:
When the Relay Option Board is installed, the Set
Hold function holds BOTH current levels, as well as ALL
relay settings.
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.
Faults are not stored; therefore, they are immediately
removed if power is cycled. If the problem causing the faults
still exists, however, faults will be displayed again after
power is re-applied and a period of time elapses during
which the diagnostic system re-detects them. The exception
to this rule is the calibration failure. When a calibration fails,
