ATI
Q46UV UV254/Turbidity Monitor
Part 5 - Configuration
38
O&M Manual
Rev-D (11/19)
Press ENTER to initiate user entry mode, and the entire value will flash.
Use the UP arrow key to modify desired value; selections are
ON
,
OFF
.
Press ENTER to store the new value.
Fail Val #1
Sets the output failure value for Iout#1.
When
Fail Out
above is set to
ON, t
his function sets value of the current loop under a FAIL condition.
The output may be forced to any value between 4 and 20 mA. Press
ENTER to initiate user entry mode, and the entire value will flash. Use
the UP arrow key to modify desired value; selections are between
4mA
,
and
20mA
. Press ENTER to store the new value.
Fail Out #2
This function sets the fail-mode of current loop output #2 under a FAIL
condition. The settings and operation are identical to Fail Out for output
#1.
Fail Val #2
This function sets the value of current loop output #2 under a FAIL
condition. The settings and operation are identical to Fail Out for output
#1.
*Fail Out #3
OPTIONAL.
This function sets the fail-mode of current loop output #3
under a FAIL condition. The settings and operation are identical to Fail
Out for output #1.
*Fail Val #3
OPTIONAL.
This function sets the value of current loop output #3 under
a FAIL condition. The settings and operation are identical to Fail Out for
output #1.
Backlight
This function has three options.
ON
– On all the time,
OFF
– Off all the
time,
AL
– Alarm (Default). This function flashes the backlight on and off
whenever the Fail icon is displayed.
Start Delay
This function is designed to minimize control or alarm issues arising from
temporary power loss. When power goes down, the monitor records the
analog output values and the status of relays and PID functions. When
power is restored, the analog values and relays will be held at the pre-
power loss values for a defined period of time. This “start delay” may be
programmed for periods from 0-9.9 minutes. This function is set to 0.0
minutes by default and must be activated by the user if desired by setting
a positive time value.
*Failsafe
This function allows the user to set the optional system relays to a
failsafe condition. In a failsafe condition, the relay logic is reversed so
that the relay is electrically energized in a normal operating state. By
doing this, the relay will not only change state when, for example, an
oxygen limit is exceeded, but also when power is lost to the controller.
When failsafe is ON, the normally-open contacts of the relay will be
closed during normal operation. In an attempt to make this configuration
less confusing, the LCD icon logic is reversed with this setting, and the
icon is OFF under this normal condition. Therefore, when the trip
condition occurs, the closed N.O. contacts will be opened (relay de-
energized), and the LCD icon will illuminate. In addition, a power fail
would also cause the same contacts to open.
