United Security Products AVD-45c Manual descargar pdf (Pagina 98)

84 UDC 6300 Process Controller Product Manual 1/03

4.6 Algorithm Data Set Up Group, Continued

Table 4-5 Algorithm Group Definitions, continued

Lower Display

Prompt

Upper Display

Range of Setting

or Selection

Parameter

Definition

CONT ALG

continued

3 POS STEP

THREE POSITION STEP - The Three Position Step

Control algorithm allows the control of a valve (or other

actuator) with an electric motor. Digital Outputs 3 and

4 generate control signals that drive external relays;

one to move the motor upscale, the other to move it

downscale, without a feedback slidewire linked to the

motor shaft.

3PSTEP is an extension of the On-Off Duplex Control

and includes internal feedback of the state of the

Digital Outputs.

In this algorithm, the error signal is compared with a

feedback signal and the result determines the state of

the Digital Outputs as follows:

Positive Error > Feedback Digital Output 3 On

Negative Error < Feedback Digital Output 4 On

Otherwise, the outputs are both off.

The 3PSTEP control algorithm provides an output

display (“OUT”) which is an estimated motor position

since the motor is not using any slidewire feedback.

Select a Motor Travel Time at prompt “MTR TIME”.

M/A STN

MANUAL/AUTO STATION—Provides an operator display for

the TDC PID loop PV, SP, OP and MODE. The UDC loop

has only Manual control at the UDC6300. Auto mode for the

loop is maintained in the TDC.

If you select Auto mode at the UDC, the MAN indicator will

blink, indicating AUTO is not available.

When the TDC provides an output override value, MAN

indicator will turn OFF.

AUTO indicator is never displayed. Output override does not

necessarily mean that the loop is in AUTO.

Other configuration settings required:

Setup CONTROL prompt PV SOURCE = NONE.

Setup CONTROL prompts SPHILIM, SPLOLIM = PV and SP

range (for bargraph).

Refer to Manual/Auto Station Addendum 51-52-99-08 for

implementation details.

MTR TIME

(appears only if 3POS

STEP is selected

above)

5 to 255 in seconds

THREE POSITION STEP MOTOR TRAVEL TIME -

this is the time it takes the motor to travel from 0% to

100%

Refer to Subsection 5.21 - Three Position Step Control

for complete configuration and operating instructions.

Table 4-5 continued on next page

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 301 302

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