Emerson 54e pH/ORP Alarm Fault, Feed limit Disable, Timeout 3600 sec, Alarm 4 Setup

MODEL 54e pH/ORP	SECTION 5.0
	SOFTWARE CONFIGURATION

5.7 CHANGING ALARM PARAMETERS (continued)

CAUTION

Understanding where to set the TPC parameters is not trivial and is likely to require substantial trial and error to yield acceptable results. pH and ORP/Redox are nonlin- ear measurements and applying PID algorithms can result in unintended effects.

Alarm 4 Setup

5.Alarm 4 is dedicated as a fault alarm. The only option for this alarm is to enable it or to disable it. To disable the alarm, press Edit 4 and use the arrow key to change "Fault" to "Off" .

Alarm: Fault

When a fault condition exists, the relay will energize and the red LED on the front display will turn on.

ExitEnter

Feed Limit Timer Setup

Feed limit: Disable

Timeout: 3600 sec

ExitEdit

7.00 pH

26.2°C 12.0mA

Feed limit alarm 1

6.	Menu Item	Options
	Feed limit (timer)	Disable/AL1/AL2/AL3
	Timeout	0-10,800 sec

The controller allows configuring one of the alarms as a Feed Limit timer. The Feed Limit timer prevent overfeeding of chemical reagent by automatically turning the relay off after a timeout period. To enable this feature, press Edit when the Feed limit is highlighted (as on the left), use the arrow key to select an alarm relay and then press Save

4.

When a feed limit alarm has timed out, a message will appear on the main display indicating "Feed limit alarm1" (for an alarm 1 feed limit), the red LED will turn on, alarm 4 will close (if not turned "Off"), the selected feed limit relay will open (de-energize), but all other alarms and current outputs will remain unchanged (i.e. this is not a real fault condition). This condition will continue until the 2 (Ack) key is pressed, at which time the controller returns to normal operation and the feed limit's clock starts again. See Table 6-1, Controller Mode Priority Chart, for controller action in the event of several modes occurring at the same time.

NOTE

Pressing the 2 (Ack) key will acknowledge all condi- tions that turn the red LED on. If another event occurs after the key is pressed, then the key must be pressed again to acknowledge the new event. This is the only way to clear a Feed Limit Timeout.

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