PCU12005 datasheet(32/96 Pages) REDLION

32 / 96 page

User Input (InPt) (Cont’d)

SPrP - Setpoint Ramp. A low level terminates setpoint ramping and the

controller operates at the target setpoint. Terminating setpoint ramping is

the same as setting the ramp rate to zero (SPrP = 0.0). A high level enables

the programmed setpoint ramp rate.

ALrS - Alarm Reset. If the alarm option is installed, a low level resets the

alarm(s) to their inactive state as long as the user input is low.

Prnt - Print Request. A low level transmits the print options selected in the

serial communications module (6-SC). If the user input is held low, after

the printing is complete a second print request is issued.

SPSL - Select Local or Remote Setpoint. On models equipped with Second

Analog Input, configured as Remote Setpoint, a negative transition

engages Remote Setpoint operation and a positive transition engages Local

Setpoint operation. Select the controller output response to the

Local/Remote transfer operation (bumpless, tracking, etc) by the setpoint

transfer parameter (SPtr).

OUTPUT MODULE (2-OP)

The controller has parameters that affect how the main control output

(OP1) responds to process changes and signal overdrive actions.

Time Proportioning Cycle Time (CYCt)

The selection of cycle time depends on the time constant of the process and

the type of output module used.

CYCt -

0 to 250 seconds

For best control, a cycle time equal to 1/10 of the process time constant, or

less is recommended; longer cycle times could degrade process control, and

shorter cycle times provide little benefit at the expense of shortened relay life.

When using a Triac module or a Logic/SSR drive output module with the SSR

Power Unit, a relatively short cycle time may be selected.

A setting of zero keeps the main control output and front panel indicator off.

Therefore, if using the analog output for control, the main output and indicator

can be disabled. This parameter is skipped for Valve Positioner models.

Output Control Action (OPAC)

The main control output (OP1) channel is programmable for reverse acting

or direct acting. Most control applications use reverse acting (See

ON/OFF

Control, page 62).

OPAC -

rEv (Reverse acting)

drct (Direct acting)

If drct (direct acting) is selected, the main output (OP1) is direct acting and

the secondary output (OP2) is reverse acting. The secondary output always

maintains the opposite setting of the main output.

Note: When using a relay output module, the control action may also be reversed

by using the normally closed contacts.

The linear DC analog output, when assigned to output power (OP) for

control purposes, tracks the controller output power demand. A direct acting

linear output signal can be implemented in two ways:

1. Use “direct” for output control action (OPAC).

2. Interchange the two analog output scaling points ANLO & ANHI (See

Linear DC Analog Output, page 26).

-24-

PCU12005 Datasheet(PDF) 32 Page - Red Lion Controls. Inc

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