Laurel-electronics LAUREATE SERIES 2 COUNTER-TIMER-SERIAL INPUT METER Bedienungsanleitung PDF herunterladen (Seite 33)

• In batch control mode with “external gate”, the meter waits a the end of every cycle

until an external gate input is grounded for a minimum of 3.33 ms. This starts a new fill

cycle by energizing Relay #1 and resetting the Batch Total. Gate time is not used.

Three values are tracked and can be separately displayed by pressing the RESET key: Item

#1, the Batch Total; Item #2, the Grand Total of all batches or Number of Batches (select-

able during setup); and Item #3, the Fill Rate.

• Item #1, Batch Total, is the total of input pulses for that batch. It may be configured to

count up from 0 to a preset, or to count down from a preset to 0. The preset value is

placed in ALARM1. SCALE1 is positive whether counting up or down.

• Item #2, Grand Total, is the sum of previous Batch Totals and the current Batch Total. It

can overflow to exponential format.

• Item #2 (alternate), Number of Batches, is the current count of batches. SCALE1 does

not apply. dECPt1 is set to 1.

• Item #3, Fill Rate, is calculated with a fixed 20 ms gate time. It may be displayed as Item

#3.

BATCH CONTROL WITH A 4-20 mA OUTPUT FLOW METER

Application:

Fill 55 gallon tanks. Use a

20 mA flow meter where 4 mA = 0 and 20

mA = 39.20 GPM. Slow down filling at 54

gallons. Cycle batches automatically with 20

sec between cycles. Displ

ay batch total & fill

rate to 2 places. Also track num

ber of

batches.

Solution:

Use an Extended counter with

a dual relay output board. Set Input to “Rate

Batch.” Set Batch to count up to ALARM1, to

use Gate Time as delay between batches,

and to make It

em #2 the number of batches.

Set Gate Time to 20 sec. Set DecPt1 and

DecPt 2 to two decimal places for Items #1

and #3 (Batch Total and Rate). Scale Item

#3 (Rate) using the co

ordinates of 2 points

method so that 20.0000 mA will be dis

played

as 39.20 GPM

. Scale Item #1 (Batch Total)

by entering a Scale1 of 1.66667 and a mul-

tiplier of 0.01. That is because totalizing

sums read

ings in gallons every second.

Since our rate is in GPM, we have to divide

by 60. E

nter an Offset1 of 55.00to serve as

the batch se

tpoint in gallons. Set Setpoint2

to 54.00 to activate Relay 2 to slow the fill

rate.

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Laurel-electronics LAUREATE SERIES 2 COUNTER-TIMER-SERIAL INPUT METER Bedienungsanleitung Seite 33

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