PCU12005 datasheet(29/96 Pages) REDLION

29 / 96 page

CONFIGURATION PARAMETER MODULES

Accessible from the unprotected parameter mode, the configuration

parameter modules allow the operator access to the controller’s fundamental

set-up parameters. There are nine possible configuration stages that can be

accessed. At the configuration stage access point “CNFP”, the operator uses

the UP & DOWN arrow buttons to select the desired configuration parameter

module. Press the PAR button to enter the module where the settings can be

viewed or modified. The PAR button is used to scroll through the parameters

and the UP and DOWN buttons are used to modify the parameter value. The

PAR button enters the desired choice, advancing to the next parameter. The

operator can press the DSP button to exit (escape) without modifying the

parameter. The unit returns to the normal display mode. After the parameters

in a module are viewed or modified, the unit returns to the configuration

access point, allowing access to other modules.

INPUT MODULE (1- IN)

The controller has several input set-up parameters that must be

programmed prior to setting any other controller parameters.

Input Type (tYPE)

Select the signal input type Voltage (VOLt), or Current (Curr). The

appropriate signal input terminal for voltage is #8 and for current is #9.

Square Root Linearization (root) (Optional)

The main input can be linearized by use of the square root function. See

Square Root Linearization, page 35, for a complete description of the square

root function.

The “root” parameter in Program Module 1 applies to the main input, and the

“root” parameter in Program Module 7 applies to the Second Analog Input.

Decimal Point Position (dCPt)

Select the desired decimal point position for the scaled display. The

selected decimal point position appears in the following parameters; rnd,

dSP1, dSP2, SPLO, SPHI, SP, AL1, AL2, db-2, AHYS, and CHYS.

0.0

0.00

0.000

Rounding Increment ( rnd)

Rounding values other than “1” causes the scaled number to ‘round’ to the

nearest rounding increment selected (ie. rounding of ‘5’ cause ‘122’ to round

to ‘120’ and ‘123’ to round to ‘125’). If the process is inherently jittery, the

display value may be rounded to a higher value than “1”. If the range of the

process exceeds the required resolution, (ex. 0-1000 PSI, but only 10 PSI

resolution required), a rounding increment of 10 will effectively make the

display more stable.

This programming step is usually used in conjunction with programmable

digital filtering to help stabilize display readings (If display stability appears

to be a problem and the sacrifice in display resolution is unacceptable,

program higher levels of digital filtering or increase the level of process

dampening). Rounding increments of 10, 20, 50, and 100 may also be used to

add “dummy zeroes” to the scaled readings, as desired.

100

The rounding increment is for the controller’s display only and does not

affect (degrade) the control accuracy of the unit.

-21-

PCU12005 Datasheet(PDF) 29 Page - Red Lion Controls. Inc

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