Programming – Max Machinery 120 FLOW RATE & TOTAL INDICATOR User Manual

Page 15

Page 15

PROGRAM RATE METER

Sub Menu 31 - Smoothing

Rate is calculated and the rate display is updated every 0.5 seconds. When rate smoothing is selected
to be greater than 0.5 seconds, the most recent rate calculation is averaged with the previous rate
calculations that were made in the smoothing period. Use the up arrow key to select the amount of
smoothing desired. Optimum smoothing is normally obtained by setting the smoothing while the flow
rate is at its lowest normal value.

Sub Menu 32 - Rate Meter Control Inputs

Any of the five rear terminal control inputs can be programmed to perform a function on the rate
meter operation. A control input is selected by pressing front panel keys 1, 2, 3, 4 or 5. Key 1 selects
control input 1, key 2 control input 2 etc. When a control input terminal has been selected, it is shown
on the left hand side of the display and its function is shown on the right hand side of the display. The
function that a control input terminal performs can be changed by pressing the up arrow key. The
functions that can be assigned to an input are: None, Unlatch Hi/Lo Alarm Outputs. Note: an input
assigned to perform a function to the rate meter can also be assigned to perform additional functions
to the totalizer in the Totalizer Program menu row. A chart is shown on page 12 to provide a
convenient means of recording the tasks each control input has been assigned.

Sub Menu 33 - Rate Meter High and Low Outputs

The rate hi and lo setpoints are used to set rate values at which the rate alarm outputs turn on. The hi
output is turned on if the rate is greater than the high setpoint, the lo output is turned on if the rate is
lower than the lo setpoint. The outputs can be programmed to follow, time out, or to latch until a
keyboard or input signal is received. In the follow mode of operation, the rate is compared to the hi
and lo setpoints after each rate update. If an output is turned on, it remains on until the next rate
update occurs and then the output is either left on or turned off depending on the comparison of the
new rate reading with the setpoints. In the time out mode of operation, the outputs can be
programmed to turn on for 0.01 to 99.99 seconds. Programming a value of 0.00 disables the timer and
causes the outputs to latch until unlatched by the keyboard or input signal. Use the up arrow key to
select the output mode of operation. The lo setpoint can be programmed greater than the hi setpoint, if
desired.

Use the < or > key to select the high or low output. The word Lo or Hi will flash when selected. Use
the Clear, number and Enter keys to enter timer values for both outputs. (The factory default is
follow.)

Sub Menu 34 - Reset Key

The Reset key can be programmed to unlatch the rate meter high and low alarms, or it can be
programmed to have no effect on the alarms. Select the function of the reset key on the rate meter
operation by pressing the up arrow key. The Reset key can be programmed for additional functions on
the totalizer operation. A chart is shown on page 12 to provide a convenient means of recording the
tasks of the Reset key. (The typical factory setting is unlatch).

Sub Menu 35 - Rate Meter Decimal Point

The rate meter can have a decimal point set in any of six positions. Use the 0-5 keys to select the
desired decimal point position. The decimal point selected here is shown in the rate display, the rate
hi/lo setpoints and the rate 4-20 mA output setpoints. Using 4 or 5 decimal places will truncate 1 or 2
letters from the rate display header. Please Note: Placement of the decimal point on the display does
not rescale the programmed rate multiplier value. See Sub Menu 12.

PROGRAMMING