AW Gear Meters MX 9000 - Manual (Page 30)

MX 9000 Process Monitor
Operation and Programming Manual
29
MX 9000 User Manual, Rev. 2.0 7/16/2013
Figure 19: Cycle out Limit Function
Do not program a cycle amount that produces more than 5 pulses per second (5 Hz).
Consider the maximum flow rate to determine the resulting output frequency. The frequency produced
(in Hz) is the actual flow rate in Engineering Units per Minute divided by 120, divided by the CYCLE
AMOUNT.
RATE Limits/Limit MARGIN
Select Limit Screen
Figure 20: Rate Limits/Limit Margins
Each Limit can be set to trigger its output based on a certain flow rate or total set point. This is often
used to indicate if a flow rate is outside its intended limits or if a certain total value has been reached in
a batch application.
Rate Value
The limit output will be off if the incoming flow rate is below the programed Rate Value and the output
will be on if the incoming flow rate is equal to or above the programmed Rate Value.
Limit Margin
The Limit Margin variable is programmed in engineering units and determines whether the Rate Limit
functions as an absolute limit or activates within a margin or “window” around the programmed Rate
Value. When the Limit Margin is programmed as zero, the limit activates whenever the flow rate equals
or exceeds the programmed value. When you enter a Limit Margin value other than zero, the limit is
active whenever the selected flow rate is within the “window” of the programmed Rate Value, plus or
minus the MARGIN value. The programmed Limit Margin must be less than the programmed Rate
Value.
Caution
C YC LE A M O UN T C YC LE A M O UN T C YC LE A M O UN T C YC LE A M O UN T C YC LE A M O UN T
LIM IT O N LIM IT O N
LIM IT O FF LIM IT O FF LIM IT O FF
2 x C YC LE A M O UN T
C YC LE O UT (PULSE O UTPUT) Lim it Fu n c t io n
Ra te Value
0000010.00 GPM
Li mi t Ma rgin
0000001.00 GPM