Red-lion P48 User Manual download pdf (Page 4)

AUTO-TUNE

The P48 has an auto-tune feature which, on demand, automatically

determines the PID control parameters for a particular process. After completion

of auto-tune, the PID parameters are automatically optimized for that process

and loaded into non-volatile memory. The operator may view and modify the

parameters as desired.

Auto-tune may be invoked either at start-up or at setpoint, depending on the

process requirements. An auto-tune programmable dampening factor produces

various levels of process control and response characteristics.

RS485 SERIAL COMMUNICATIONS

The RS485 communications option allows the connection of up to 32 devices

on a single pair of wires with a distance of up to 4,000 feet and a maximum baud

rate of 9600. Since the same pair of wires are used for both transmit and receive,

only one way communication is possible at any given time. The controller has

a programmable response time to allow the host device adequate time to release

the communication line for a transmission.

Selected parameters from the P48 can be interrogated or changed, and alarm

output(s) may be reset by sending the proper command code via serial

communications. It is also possible to invoke Auto-tune through the serial port.

Serial communications used with SFCRM software allows for easy controller

parameter configuration by computer.

DUAL TIME PROPORTIONAL SYSTEMS

The P48 is available with dual time proportional outputs. The dual outputs

can be used for level or heat/cool applications. The A2 output can be configured

for Secondary (cool) control. This allows for dual PID control or ON/OFF

control with unbalanced hysteresis.

CONTROLLER PROGRAMMING

Front Panel Program Disable allows all of the controller’s set-ups to be

locked-out from further operator intervention after the initial set-up.

The following four programming modes allow the controller to adapt to any

required user-interface level:

Unprotected Parameter Mode

Protected Parameter Mode

Hidden Function Mode

Configuration Parameter Mode

UNPROTECTED PARAMETER MODE

The Unprotected Parameter Mode is accessible from the Normal Display

mode when program disable is inactive or when the proper access code number

from the Protected Parameter Mode is entered. The Configuration Parameter

Modes can be accessed only from this mode.

“SP” - Enter setpoint

“OP” - Enter output power

“ProP” - Enter proportional band

“Intt” - Enter integral time

“dErt” - Enter derivative time

“AL-1” - Enter value for alarm #1

“AL-2” - Enter value for alarm #2

“CNFP” - Select configuration access point

“End” - Return to normal display mode

PROTECTED PARAMETERS MODE

The Protected Parameters Mode is enabled when program disable is active.

This mode prevents access to the configuration modes without the proper access

code number. Only the parameters that are enabled in the Configuration 3

parameter (lock-out section) can be accessed.

“ProP” - Enter proportional band

“Intt” - Enter integral time

“dErt” - Enter derivative time

“AL-1” - Enter value for alarm #1

“AL-2” - Enter value for alarm #2

“CodE” - Enter value to access unprotected parameters and

configuration parameters

HIDDEN FUNCTION MODE

The Hidden Function Mode is accessible from the Normal Display Mode.

The functions in this mode may be locked-out individually in Configuration 3

parameter (lock-out section).

“SPSL” - Select local (SP1 or SP2) or remote setpoint

“trnF” - Transfer between automatic (PID) control and manual control

“tUNE” - Invoke/cancel PID Auto-tune

“ALrS” - Reset latched alarms

CONFIGURATION PARAMETER MODE

The Configuration Parameter Mode allows the operator to set-up the basic

requirements of the controller. It is divided into sections which group together

related programming steps, such as inputs, outputs, alarms, etc. Upon completion

of each section, the program returns to the Configuration Access Point allowing

the user to return to the Normal Display Mode.

Configuration 1, Inputs (1-IN)

“tYPE” - Select input signal type

“dCPt” - Select scaled display decimal point position

“rnd” - Enter rounding increment and trailing zeros for scaled display

“FLtr” - Select level of input filtering

“dSP1”

“InP1”

- Scale main input

“dSP2”

“InP2”

“SPLO” - Enter setpoint lower limit

“SPHI” - Enter setpoint higher limit

“SPrP” - Enter setpoint ramp rate

“InPt” - Select user input function

Configuration 2, Outputs (2-OP)

“CYCt” - Enter time proportioning cycle time

“OPAC” - Select output control action

“OPLO” - Enter output power low limit

“OPHI” - Enter output power high limit

“OPdP” - Enter output control dampening

“CHYS” - Enter ON/OFF control hysteresis

“tcOd” - Select auto-tuning dampening

“ANtP” - Main Linear DC analog output range

“ANAS” - Main Linear DC analog output source

“ANut” - Main Linear DC analog output update time

“ANLO” - Main Linear DC analog output scaling low

“ANHI” - Main Linear DC analog output scaling high

Configuration 3, Parameter Lock-Outs (3-LC)

“SP” - Select setpoint access level

“OP” - Select power access level

“dEv” - Enable deviation display

“bdSP” - Enable blank display

“CodE” - Enter parameter access code

“PId” - Select PID access level

“AL” - Select alarm access level

“ALrS” - Enable alarm reset access

“SPSL” - Enable local/remote selection

“trnF” - Enable auto/manual mode selection

“tUNE” - Enable auto-tune invocation

Configuration 4, Alarms (4-AL)

“ACt1” - Select operation mode of alarm #1, or select main output

“rSt1” - Select reset mode of alarm #1

“Stb1” - Enable activation delay of alarm #1

“AL-1” - Enter value for alarm #1

“ACt2” - Select operation mode of alarm #2, or select second output

“rSt2” - Select reset mode of alarm #2

“Stb2” - Enable activation delay of alarm #2

“AL-2” - Enter value for alarm #2

“AHYS” - Enter hysteresis value for both alarms

Configuration 5, Second Output (5-O2)

“CYC2” - Enter time proportioning cycle time

“GAN2” - Enter relative gain

“db-2” - Enter deadband or overlap

Configuration 6, Serial Communications (6-SC)

“bAUd” - Select baud rate

“ConF” - Select character frame format

“Addr” - Enter address

“Abrv” - Select abbreviated or full transmission

“PoPt” - Select print options

Configuration 7, Remote Setpoint Input (7-N2)

“dSP1” - Enter remote setpoint display scaling value #1

“INP1” - Enter remote setpoint process scaling value #1

“dSP2” - Enter remote setpoint display scaling value #2

“INP2” - Enter remote setpoint process scaling value #2

“FLtr” - Enter remote setpoint filter time constant

“bAnd” - Enter remote setpoint filter disable band

“trnF” - Select Local/Remote setpoint transfer response

Configuration 8, Second Linear DC Analog Output (8-A2)

“A2tP” - Second linear DC analog range

“A2LO” - Second linear DC analog scaling low

“A2HI” - Second linear DC analog scaling high

Configuration 9, Factory Service Operations (9-FS)

“Code 48” - Calibrate Instrument

“Code 66” - Reset parameters to factory setting

These parameters may not appear due to option configuration or other

programming.

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Red-lion P48 User Manual Page 4

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