Red-lion TCU User Manual download pdf (Page 44)

Print Options (PoPt)

Selecting YES for the print options allows the operator to scroll through

the available options using the PAR button. The up and down arrow keys

toggle between “yes” and “no” with “yes” enabling the option to be printed

when a print function occurs.

INP - Print Input Temperature Value

SEt - Print Setpoint Value

OPr - Print % Output Power Value

Pbd - Print % Proportional Band Value

INt - Print Integral Time Value

dEr - Print Derivative Time Value

AL1 - Print Alarm 1 Value

AL2 - Print Alarm 2 Value

dEv - Print Deviation From Setpoint Value

OFP - Print % Output Power Offset Value

r-P - Print Setpoint Ramp Rate Value

Crg - Print Cooling Relative Gain Value

Cdb - Print Cooling Deadband

OSt - Print Output Status

rAt - Print Remote Setpoint Ratio

bIA - Print Remote Setpoint Bias

rSP - Print Remote Setpoint Reading

IN2 - Print Second Input Reading

Pb2 - Print Proportional Band #2

It2 - Print Integral Time #2

dt2 - Print Derivative Time #2

SP2 - Print Internal Cascade Directed Setpoint

HCr - Print Heater Current Reading

Second Analog Input Module (7-2n) (Optional)

The Second Analog Input can be configured as a Remote Setpoint Input or

as a Secondary Input for Internal Cascade control. As a Remote Setpoint, the

controller can operate as an External Cascade controller, Setpoint Slave

controller and as a Ratio controller. See Cascade Control, page 60, for an

overview of cascade control.

Operation mode (OPEr)

The Second Analog Input must be configured for either Remote Setpoint

Operation or Internal Cascade Operation (single controller cascade).

rSP - Remote Setpoint

CSCd - Internal Cascade

Square Root Linearization (root)

In some cases it may be necessary to linearize the Second Analog input by

use of the square root function.

Selection of ‘yES’ results in the square root linearization of the Second

Analog Input (only). Selection of ‘NO’, results in linear scaling. The square

root linearization exhibits a 3% low cut point (17% of scaled reading) to

eliminate reading jitter at low flow rat es. The following example illustrates

the scaling of the Second Analog Input with square root linearization .

Example: It is necessary to square root linearize the output of a differential

pressure transmitter to indicate and control flow. The defining equation is

F = 278 D p

,whereD P = 0 - 500 PSI, transmitted linearly by a 4 - 20 mA

transducer. At full flow rate ( D P = 500 PSI), the flow is 6216 ft

/h. The

following scaling information is used with the controller:

dCP2 = 0

root = yES

dSP1 = 0 Ft

/hr

INP1 = 4.00 mA

dSP2 = 6216 Ft

/hr

INP2 = 20.00 mA

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Red-lion TCU User Manual Page 44

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