ATI
PQ45P pH System
Part 5
– Operation
25
O&M Manual
Rev-B (7/15)
4.85 Control Menu [CONTROL]
The Control Menu contains all of the output control user settings:
Set 0V #1
These functions set the output range for each of the two instrument
Set 2.5V #1
outputs. The value stored for the 0V point may be higher or lower
Set 0V #2
than the value stored for the 2.5V point.
Set 2.5V #2
The entry values are limited to values within the range selected in the
“Set Range” parameter under the CAL Menu and must be separated by
at least 1% of this range. Use the LEFT arrow key to select the first digit
to be modified. Then use the UP and LEFT arrow keys to select the
desired numerical value. Press ENTER to store the new value
.
NOTE:
If the temperature units are changed between °C and
°F (see Temp Units in this section), the default settings for
this output will be stored (present data is not converted.)
4.86 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 halts operation of the PID controller. 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.
