PXU20020 Datasheet, PDF(10/32 Page) Red Lion Controls. Inc – MODEL PXU

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PXU20020 Datasheet, PDF (10/32 Pages) Red Lion Controls. Inc – MODEL PXU - TEMPERATURE/PROCESS CONTROLLERS

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Display/Parameter/Hidden Loop Parameter Descriptions

The following parameters may be locked from display or made available in

either the main Display Loop, the Parameter Loop or the Hidden Loop as

configured in programming module 3-LC. Values configured for dSPr are read

only when in the main display loop, but are writable when in the Hidden Loop.

The value mnemonics are shown for each parameter, as well as the factory

setting for each of the values.

ïïx ï

ïï°

ACTIVE SETPOINT VALUE

ïï¹ï¹ï¹ to ï¹ï¹ï¹ï¹ display units *

The parameter name indicates the active setpoint. The Setpoint value can be

changed by pressing the arrow keys. This parameter can be configured as read

only in the Display Loop, but read/write in the Hidden Loop (dSPr). Select the

second Setpoint value by using the 1 or 2 key, user input, or the SPSL

parameter. Both Setpoint values are limited by the Setpoint Low and High

Limits in Input Module 1-IN.

CONTROL OUTPUT 1 or 2 % OUTPUT POWER

OP1 ï

ï ï°ï®ï°

0.ï° to ï±ï°ï°ï®ï°

OP2 ï

ï ï°ï®ï°

While the controller is in Automatic Mode, this value

is read only. When the controller is placed in Manual

Mode, the value can be changed by pressing the arrow

keys. For more details on % Output Power, see Control

Mode Explanations.

r-S ï

ï rUN

CONTROLLER STATUS

rUN StOP

When in rUN mode, the control output(s) respond based on their corresponding

% output value. When in StOP mode, the control output(s) are disabled.

Integral wind-up can be reset by entering StOP and then going back to rUN

mode.

ïïïï ï

ï ï°ï®ï°

OUTPUT POWER OFFSET

0.ï° to ï±ï°ï°ï®ï° % power

When the Integral Time is set to zero, the power offset is used to shift the

proportional band to compensate for errors in the steady state. If Integral Action

is later invoked, the controller will re-calculate the internal integral value to

provide âbumplessâ transfer and Output Power Offset will not be necessary.

ïï²ï¯ï ï

ï 7ï°

PROPORTIONAL BAND

0 to ï¹ï¹ï¹ display units *

The proportional band should be set to obtain the best response to a process

disturbance while minimizing overshoot. For more information, see Control

Mode and PID Tuning Explanations.

ïïï²ï ï

ïï°

SETPOINT RAMP RATE

ï° to ï¹ï¹ï¹ display units/minute *

By ramping the setpoint at a controlled rate, the setpoint ramp rate can reduce

sudden shock to the process and reduce overshoot on startup or after setpoint

changes. When viewing setpoint value, and the setpoint is ramping, the setpoint

will alternate between rSPx and the target setpoint value. The ramp rate is in least-

significant (display units) digits per minute. A value of 0 disables setpoint

ramping. Once the ramping setpoint reaches the target setpoint, the setpoint ramp

rate disengages until the setpoint is changed again. If the ramp value is changed

during ramping, the new ramp rate takes effect. If the setpoint is ramping prior to

starting Auto-Tune, the ramping will terminate when Auto-Tune starts. Deviation

and band alarms are relative to the target setpoint, not the ramping setpoint. A

slow process may not track the programmed setpoint rate. At power up, the

ramping setpoint is initialized to the current temperature/process value.

ïId ï

ï1

PID GROUP

1 or 2

Select different PID parameters by choosing one of two different PID groups.

* Range/Decimal position is Programming dependent.

ïï®ï´ï´ ï

ï ï±ï²ï°

INTEGRAL TIME

ï° to ï¹ï¹ï¹ï¹ seconds

Integral action shifts the center point position of the proportional band to

eliminate error in the steady state. The higher the integral time, the slower the

response. The optimal integral time is best determined during PID Tuning.

ï¤ïï²ï´ ï

ï ï³ï°

DERIVATIVE TIME

ï° to ï¹ï¹ï¹ï¹ seconds

Derivative time helps to stabilize the response, but too high of a derivative

time, coupled with noisy signal processes, may cause the output to fluctuate too

greatly, yielding poor control. Setting the time to zero disables derivative action.

ï¤Inï´ ï

ï 0.0

INTEGRATION DEFAULT

0.ï° to ï±ï°ï°ï®ï° % output power

The Integration Default is the default integration value of integral control.

When the process value enters the proportional band, the PXU will take the

Integration Default as the default control output of integral control. The value is

determined at Auto-Tune.

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