AW Gear Meters FEM-03 - Manual (Page 30)

FEM-03 Flow Monitor
Operation and Programming Manual
29
TOTAL Limits
To operate a limit based on the JOB TOTAL, select TOTAL A or TOTAL B for the Limit function. The limit
activates whenever the TOTAL equals or exceeds the programmed value.
CYCLE OUT
Assigning a limit to the CYCLE OUT function toggles the state of the limit output whenever Job TOTAL A
increments by the cycle amount. The output remains ON until the cycle amount accumulates, and turns
OFF until the cycle amount accumulates again. The total accumulated between a rising and falling edge
is the cycle value. The total accumulated between any two rising or any two falling edges is twice the
cycle value. The cycle value in engineering units corresponds to the KFT and decimal location. It is highly
recommended that you do not program a cycle amount that produces more than one pulse per second.
Consider the average flowrate to determine an acceptable resulting output frequency. When
considering a large cycle amount, keep in mind that any external totalizer will miss up to one cycle
amount of accumulation whenever power cycles to the FEM-03. Assign either or both limits to CYCLE
OUT.
WARNING/ALARM Limits (FEM-03Ax only)
Used for ratio monitoring applications, the WARNING/ALARM AB and WARNING/ALARM BA
assignments operate with the RATIO AB or RATIO BA program variables. Assigning WARNING AB or
WARNING BA causes the limits to function as ratio limit outputs which will activate whenever the ratio
of A/B or B/A differs from the programmed ideal ratio by an amount equal to or greater than the
assigned % error value. Program the IDEAL RATIO and the ratio WARNING% and ALARM% from the
RATIO AB or RATIO BA display screen. When assigned to WARNING/ALARM functions, L1 assumes the
value from the WARNING%, and L2 assumes the value from the programmed ALARM% variable. The
limits are in percent, from 1 to 100%. The initial WARNING and ALARM error limit values are 5% and
10% respectively. Program the % value for ratio WARNING/ALARM assignments from either the LIMITS
or RATIO programming screens.
Programming the Limit Functions
To program the limit functions, use the MODE key UP to select the LIMIT display.
1. Press and hold the ENT key. The display first shows a P in the lower left-hand corner and then
highlights the L1 indication with a blinking cursor.
2. Use the SEL key to select the function of the limit assignment.
3. Press ENT when the desired mode is displayed; the cursor highlights the numeric value for L1.
Entries correspond with the scaling factor, decimal location and engineering units for the
function selected. The left-most digit is highlighted with a blinking cursor.
4. Move the cursor left to right using the SEL key. Use the UP or DN to increase or decrease each
digit’s value.
5. When you have completed editing and the desired value displays, press ENT to store the value
for L1. If a RATE assignment has been made, the FEM prompts the user to enter the RATE LIMIT