MODEL 54e pH/ORP

SECTION 5.0

 

SOFTWARE CONFIGURATION

5.7 CHANGING ALARM PARAMETERS

Outputs

Alarms

Security

This section describes the options available for configuration of the alarms. Alarms 1, 2, and 3 can be activated on pH (or ORP/Redox, see Appendix A), or temperature. One of these alarms can be setup as a feed limit timer and another alarm can be dedicated as an interval timer. Alarm 4 is reserved as a fault alarm.

 

 

 

 

Alarms that activate on pH (or ORP/Redox) or temperature can be con-

 

Exit

Enter

figured as on/off (normal), or TPC. These modes are described below.

 

 

 

 

The two alarm modes have several configuration options that are

 

 

 

 

described in detail in this section.

 

 

 

 

1. Beginning from the main menu, move the cursor down to "Program"

 

 

 

 

and press Enter 4. From the program menu, move the cursor down

 

 

 

 

using the arrow key b to highlight "Configure" and press Enter 4.

 

 

 

 

Use the arrow key again to highlight "Alarms" (as shown on the left)

 

 

 

 

and press Enter 4.

 

 

 

 

 

 

 

 

 

2. There are 9 menu headers that relate to alarms. Alarms 1, 2, and 3

 

Alarm 1 control

 

each have a control header and a setup header. Alarm 4 has a sim-

 

 

 

 

 

 

 

 

ple setup header. Configuration of a feed limit timer and an interval

 

Alarm 1 setup

 

 

 

timer is also described here.

 

Alarm 2 control

 

To access each header, highlight the desired item and press the Enter

 

 

 

 

4 key. To select another header, use the arrow keys. The bottom

 

Exit

Enter

menu header will only be highlighted if the end of the menu has been

 

 

 

 

reached.

 

 

 

 

NOTE

 

 

 

 

 

 

 

 

Alarm 2 setup

Alarm 3 control

Alarm 3 setup

ExitEnter

Alarm 4 setup

Feed limit timer

Interval timer

ExitEnter

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Always configure the control parameters BEFORE mak- ing changes in the alarm setup. Changes in the output setup in step 4 will depend on the options that have been selected in step 3.

Alarm Modes:

Normal: Alarm turns on when setpoint is exceeded and turns off when the reading no longer exceeds the setpoint (simple high alarm example).

Fault: Alarm turns on when controller detects a fault condition.

TPC: Alarm turns on for a time that depends on what the reading is. The time it stays on is proportional to how far the reading is from the 0% On Time point, also called the setpoint. (time proportional control)

TPC: Alarm turns on for a time that depends on what the reading is. The time it stays on is proportional to how far the reading is from the setpoint (time proportional control). In addition, the "on time" can be dependent on how long the reading has exceeded the setpoint (inte- gral control) and how fast the reading has actually changed (deriva- tive control).

Feed limit timer: When the alarm has been energized (on) for a long period, it automatically turns off to prevent overfeeding of chemicals.

Interval timer: Alarm is programmed to activate at various times, usu- ally to provide automated cleaning. Useful for spray cleaning and/or automatic retraction of sensors in processes.

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Emerson 54e pH/ORP instruction manual Alarms, Alarm 3 control, Interval timer