See link below for a tutorial video on the Despatch recommended method for setting up an alarm on the MCT4 control.
Below is a transcript of the audio in the linked video
MCT4 control, Alarm Setup
The MCT4 control can assign various types of alarms to the auxiliary relays.
On this control, all the relays are assigned as events.
This tutorial will show how to change the EV5 event into a Process high alarm with a 50-degree setting.
We will use soft alarms, and math functions.
To access the soft alarm and math settings, perform this sequence.
Press Menu
Then Settings
Menu
Offline
Yes
Menu
Exit
Press Exit application. Configuration mode startup.
Then press yes
When the screen says System Startup, Please Wait,
Turn off the power to the control, then after a few seconds, turn the power back on.
The control will reboot, and start up in the MCT configuration mode.
Press Menu,
Then Setup,
Then Soft Alarm Configuration.
The default on a Despatch provided control is for soft alarm 1 to be a Process High alarm
Pressing the left or right arrows, will cycle through the other default soft alarms.
Soft alarm 2 is a Process Low alarm
Soft alarm 3 is a Deviation High alarm
Soft alarm 4 is a Deviation Low alarm
Soft alarm 5 is an End of Program alarm
For this example, we will use the Soft Alarm 1, Process High alarm.
The Silent on, off toggle sets the ability to see and hear the alarm from the home screen.
We will leave the Silent toggle on for now so the alarm will not be visible.
We will show an example at the end of the video of when this setting is set to off.
We will change the Alarm Setpoint to 50 degrees so the alarm will be active at ambient temperature.
To assign this soft alarm to a relay, press Menu,
Then Setup,
Then Math, Logic Configuration.
On this screen, you can see that Math Logic 1 is set up for SA1 or soft alarm 1
Pressing the left or right arrow will show that other math logic functions are for other soft alarms.
For this example we want to assign Math Logic 1 to the fifth relay.
Touch the Output field.
On this control, the fifth relay is in Slot 2, Event output 4
Slide down, and select S2_EvOut4
When finished, press Menu,
Then File,
Then Exit.
And Yes.
When the screen says System Startup, Please Wait, turn the power off to the control, wait a few seconds, then power back on.
The control will take a few seconds to reboot.
After reboot, we need to change the label for the fifth relay.
Press Menu
Then Settings,
Then Menu again.
Press Events
Slide the screen up and select EV5.
Press Clear, then enter the desired name for this relay.
For this example, we will use ALM1.
Press Done, then press Home to return to the home screen.
Press Manual Operation and you will see that the fifth relay is now ALM1, and the process high alarm is on.
This completes the tutorial on setting up alarms on the MCT4 control.
The alarm setpoint can also be changed from the alarm settings screen.
To access the alarm settings screen, press menu
Then Settings.
Then Alarm.
On this screen, you can see Alarm #1 is the Limit High Limit.
Alarm #2 is the typically unused Limit Low Limit.
Pressing the right arrow, displays Alarm #3 is the Loop1 Process High alarm.
Press the SP value, you can enter the new alarm setpoint.
Entering 300 for the new setpoint, the alarm should now be off at ambient temperature.
I have now changed the Silent on, off toggle switch to off.
If we change the Process High alarm setpoint to 70, the alarm will come back on, and will now be visible from the main screen.
The alarm is displayed as a yellow flashing triangle, with an alarm sound.
Touching the yellow triangle will show a list of alarms.
Pressing Clear will silence the alarm, and remove any inactive alarms from the list, but the alarm is still active.
Changing the process high alarm setpoint back to 300, the alarm goes away, and the alarm can be cleared.
This completes the tutorial on setting up alarms on the MCT4 control.