Red Lion LEGEND - Manual (Page 7)

When power is turned off, the unit automatically saves the settings and data in
its no-power memory. When power is restored, the LGB restores the parameters
it had at power down. The EPROM’s life expectancy is at least 100,000 power
cycles. The LGB offers a choice of seven programmable counting modes for use
in applications requiring Bi-directional, Anti-coincidence, and Quadrature
counting. A separate inhibit terminal can be used for any of the count modes.
Input A accepts a signal for the Count (Process & Total) and Rate displays.
Input B accepts a signal for the Count (Process & Total) display or direction
control. In the Anti-coincidence mode both inputs are monitored simultaneously,
so that no counts are lost, and the final count can be chosen as the sum or
difference of the two inputs.
Rate and Count (Process & Total) displays have separate scaling and decimal
point placement, for the readouts in different units.
The Counter Load feature enables the operator to modify the count value
under circumstances that occur when flawed material has been counted and it is
necessary to adjust the count value accordingly.
The rate operates in the time interval method (1/tau) to calculate the rate value.
This method insures high resolution at all input rates. Averaging can be
accomplished by programming the Minimum and Maximum Update Time for the
desired response. Extensive scaling capabilities allow practically any reading at
very slow input rates.
The plug-in relay board operates with the Process counter and has two, 5 amp,
240 VAC relay outputs. The open collector outputs can be assigned to either the
Batch count, Total count, or Rate indicator. The programmable outputs can be set
for a variety of functions.
The construction of the Legend LGB unit is a lightweight, high impact plastic
case with a clear viewing window. The sealed front panel with the silicone rubber
keypad meets NEMA 4X/IP65 specifications for wash-down and/or dusty
environments, when properly installed. Plug-in style terminal blocks simplify
installation and wiring change-outs.
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in the
manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
Do not use this unit to directly command motors, valves, or other actuators not
equipped with safeguards. To do so, can be potentially harmful to persons or
equipment in the event of a fault to the unit.
BASIC OPERATION
The Legend contains three counters that keep track of the Process Count,
Batch Count, and Total Count. The unit takes the actual number of pulses
counted (internal count value) and multiplies them by the Count Scale Factor and
Count Scale Multiplier. This results in the desired reading value for the Process
and Total count displays. The Batch Count will register one count each time a
process is completed.
The Process and Batch Counters have three Reset Action modes associated
with their displays; Reset to Zero (up-count modes), Reset to Preset (down-count
modes), or Reset to the Counter Load value. Both counters can be independently
programmed to operate in one of these reset modes. A Reset can be a manual
reset, using a programmable user input, or it can be one of the seven
programmable Automatic Reset modes. Both the reset action and automatic reset
modes are programmed in the Program Counter Module.
The Process Counter displays the scaled number of pulses in the current Batch
cycle. The Batch counter will display the number of processes that have been
completed. The Batch counter will only increment if the process counter is
programmed for one of the automatic reset modes. When the process count
equals either preset 1 or 2 depending on the selection of the automatic reset mode,
the Batch count will increment by one. The Batch count can also be programmed
to automatically reset if desired.
The Total Count is the total number of counts that have been received since the
Total was last reset. It can be used to keep a running total of process units on a
desired per shift, per day, per week, etc. basis. The Total Count will always reset
to zero and requires a manual reset by a user input. The reset can be independent
of the process and batch count.
The internal precision of the Process and Totalizing Counter is maintained to 9
digits. The internal precision of the Batch Counter is 7 digits.
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