Sterlco M2B+ Controller - Manual (Page 33)

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5-4 Programming the Alarms
The controller is set up to monitor both critical and non-critical operations within the process.
Based on the severity of the condition, the controller will alarm and perform a specific
function based on the type of unit being controlled. If an alarm is tripped, the LCD display
will flash the backlight and if an audible alarm is present, turn it on. Below is a brief
explanation of each of the eight areas that the controller monitors and how to set them up.
Temperature
This alarm is used to monitor the difference between the setpoint and the “to process”
temperatures. The alarm can be configured as an absolute or deviation alarm. When setting
the alarm value for an absolute alarm (Alarm1 Mode = ABS), simply set the value at which
the alarm is to occur.
When setting the value for the deviation alarm (Alarm1 Mode = DEV), set the difference in
value from the Setpoint desired. For example if you want to configure Alarm 1 as a high and
low deviation alarm (Alarm1 Cfg = HILO and Alarm1 Mode = DEV), and you want the low
alarm to be 5 degrees below the setpoint, then set Alarm 1 Low = 5. If a high alarm is to be
20 degrees above the setpoint, then set Alarm 1 High = 20. If the setpoint is changed, the
alarm will continue to maintain that deviation.
Use the following procedure to set up the temperature alarm to be either an absolute alarm or
a deviation alarm:
1. Press the Index button two times to access the Secondary menu.
2. Press the Enter button.
3. Press the Index button until the display reads “Alarm1 Cfg.”.
4. Press the Enter button.
5. Press the Up and Down buttons to select the alarm type: low, high, hilo, or evnt.
6. Press the Enter button.
7. Press the Index button one time to see “Alarm1 Mode.”
8. Use the Up and Down buttons to select ABSL for absolute or DEV for deviation.
9. Press the Enter button.
10. Press the Alarm Silence button to return to the Running mode.
11. Press the Index button one time to access the Primary menu.
12. Press the Enter button.
13. Press the Index button until the alarm type you selected in Step 5 appears (example
Alarm 1 Low).
14. Press the Enter button.
15. Use the Up and Down buttons to select the temperature for the configured alarm.
16. Press the Enter button.
17. Repeat Steps 15 and 16 until all of the alarm configurations are set up.
18. When finished, press the Alarm Silence button to return to Running mode.
The factory setup of the alarms is to be in an On/Off reset mode (Alarm1 Reset =
ONOF). The reset declares how the controller is supposed to function when the
alarm is tripped. The On/Off mode allows the controller to reset the alarm when
the offending parameter is cleared. The HOLD mode makes the alarm a critical
one in which the user has to turn the controller off and then on to clear the alarm.