Operating Manual

Accu-Wave Chapter 6 Cuurent Outputs, Relays, and Alarms
TN Technologies 6-3
Set Up Fault Alarms or Change Process Alarm Assignments
Note: If no relays are installed in your gauge, the “Set up fault alarms...” menu
will not be displayed initially. Use the “Special functions” menu (page 8-
19) to enable alarm related functions so you can set up a non-relay display
alarm or other indicator.
The ”Set Up Fault Alarms…” menu provides four submenus which allow you to:
• Set up alarms to execute commands
• Assign process alarms to monitor specific measurements
• Assign relays to warning and fault alarms
• Assign relays to mode alarms
Non-relay Alarms
If your gauge does not have relays installed, the various alarm setup options will not be
displayed in the menus. To enable display of the alarm setup menu options, you must go to
the “Special Functions” menus (page 8-19) and change the item “Do not enable alarm
related selections” to “Do enable.” You will then be able to assign any of the alarm
indicators with the exception of controlling a relay.
Alarm Types
Process alarms actions occur when a process measurement value (level, volume, etc.)
passes either the alarm set point or alarm clear point, that is, when the alarm is activated
or when the alarm clears. The default alarm indicator for process alarms is to control relay
number N, where N is the alarm number.
Fault and warning alarms alert you to potential problems with the operation of the gauge.
The fault and warning alarms are:
• system fault
• radar head fault
• waiting for echo
• echo is lost
• signal saturated warning
• current output maximum or minimum reached
Mode alarms provide information about the status of the gauge.
• holds are active
• alternate output in use
• alternate time constant
• keypad in use
• power has been off
Fault, warning, and mode alarms do not have a default assignment. In some cases, a
warning message is displayed. The status and history of alarms can be reviewed using the