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Feed limit : Disable
Timeout: 3600 sec
Exit Edit
1.000 ppm
26.2°C 12.0mA
Feed limit alarm 1
MODEL TCL SECTION 7
SOFTWARE CONFIGURATION
7.7 CHANGING ALARM PARAMETERS (continued)
Example: The setpoint is 3.00 ppm. The URV is +5.00 ppm and
the LRV is 0.00 ppm. The time period is 30 seconds. When the
concentration is 4.00 ppm, the relay will be on (4-3)/(5-0) = 20%
of the time or 6 seconds.
Relay default: Relay default determines how the relay will act if
there is a fault or hold condition. The choices are on (relay
closed), off (relay open), or none (relay remains unchanged).
USE OF TPC
Setting TPC parameters is not trivial. Substantial trial
and error is often needed before results are accept-
able. For non-linear measurements, like pH, applying
PID algorithms can result in unintended effects.
9. Alarm 4 setup:
Alarm 4 is a dedicated fault alarm. When a fault condition exists, the
red LED on the front display will light.
a. From the menu header screen (step 6) move the cursor to "Alarm
4 setup."
b. To disable the alarm, press Edit (F4) and use the key to
change the "Fault" to "Off"
10. Feed limit timer setup:
Alarm 1, 2, or 3 can be configured as a feed limit timer. The feed limit
timer prevents overfeeding of treatment chemicals by automatically
turning off the relay after a timeout period.
a. From the menu header screen (step 6) move the cursor to "Feed
limit timer." Press Enter (F4).
b. With the cursor on "Feed limit" press Edit. Use the key to scroll
through the choices: disable, AL 1, AL 2, and AL 3. Press Save
(F4) to store the selection.
c. Move the cursor to "Timeout". Press Edit (F4) and use the arrow
keys to change the timeout to the desired value. Press Save (F4)
to store the setting.
Operation of the feed limit timer. When a feed limit alarm has
timed out, "Feed limit alarm 1" (if alarm 1 was chosen) appears in
the display. At the same time the red FAIL LED will light and alarm
4 will close (if not turned off), and the selected feed limit relay (alarm
1) will open (de-energize). All other alarms and current outputs will
remain unchanged. The relays remain in the state described until
the Ack (F2) key is pressed, at which time the controller returns to
normal operation and the feed limit clock starts again.
NOTE
Pressing Ack (F2) acknowledges all conditions that turn
on the red LED. If another event occurs after F2 is
pressed, F2 must be pressed again to acknowledge the
new event.
Alarm : Fault
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