Red-lion TSC User Manual download pdf (Page 17)

OPERATION OVERVIEW

CONTROLLER POWER-UP

Upon applying power, the controller delays control action and temperature

indication for five seconds to perform several self-diagnostic tests and

displays basic controller information. Initially, the controller illuminates both

displays and all annunciators to verify that all display elements are

functioning. Following, the controller displays the programmed input sensor

type in the Main display (verify that the input select sensor jumper matches the

programming). Concurrently, it displays the current revision number of the

operating system software in the bottom display. The controller checks for

correct internal operation and displays an error message (E-XX) if an internal

fault is detected (see Troubleshooting).

A profile can be programmed to Start (run mode), Stop (off mode), or Pause if

it was running on power-up (see “Profile Power Cycle Status Parameter” section).

Upon completion of this sequence, the controller begins control action by

displaying the temperature and updating the outputs based upon the PID

control value.

CONTROLLER POWER DOWN

At power down, the steady state control value as well as all parameters and

control modes are saved, to provide a quick and predictable temperature

response on the next power-up.

When powering down the process, it is important to power down the

controller at the same time. This prevents the reset action of the controller

from shifting the proportional band while the temperature is dropping, which

prevents excessive overshoot on the next process start-up.

PROCESS START-UP

After starting the process, the controller’s PID settings must be initially

“tuned” to the process for optimum temperature control. Tuning consists of

adjusting the Proportional Band, Integral Time, and Derivative Time

parameters to achieve the optimum response to a process disturbance. Once

the controller is tuned, it may need to be re-tuned if the process has been

changed significantly. Several options exist for tuning these parameters:

A) Use the controller’s built-in Auto-Tune feature (see Auto-Tune).

B) Use a manual tuning technique (see manual tuning).

C) Use a third party tuning software package (generally expensive and not

always precise).

D) Use values based on control loop experience or values from a similar process.

If the controller is a replacement, the PID settings from the unit being

replaced may be used as good initial values. Be sure to consider any

differences in the units and the PID settings when replacing. The PID settings

may be fine tuned by using the techniques outlined in the PID Control section.

After tuning the controller to the process, it is important to power the load and

the controller at the same time for best start-up response.

MANUAL (USER) & AUTOMATIC OPERATION

The controller can be transfered between Automatic control (closed loop;

PID or ON/OFF control) and Manual control (open loop). Placing the

controller in the Manual Mode does not impede the advancement or operation

of a running profile. In the Hidden Function Mode, the “trnf” parameter allows

the operator to select the desired operating mode. To allow front panel

switching between control modes, program the transfer (trnf) parameter to

“Enbl” in the Lockout module. The User Input or RS-485 serial interface

option may also be used to perform the auto/manual transfer function,

independent of the setting in the Lockout module.

Manual operation provides direct control of the output(s) from 0 to +100%,

or -100% to +100% if cooling output is installed. The MAN (manual)

annunciator flashes to indicate that the unit is in manual operation.

In the Manual Mode, the output power can be adjusted using the front panel

arrow buttons when % output power is viewed in the lower display. If the %

output power is locked or read only, then the output power can be adjusted in

the unprotected parameter mode when OP is viewed. With the serial option,

the % output power can be modified independent of what is viewed in the

display as long as the unit is in the manual mode.

When transferring the controller mode from/to automatic, the control

power output(s) remain constant, exercising true “bumpless” transfer. When

transferring from manual to automatic, the power initially remains steady but

integral action will correct (if necessary) the closed loop power demand at a

rate proportional to the Integral Time. The programmable high and low power

limit values are ignored when the unit is in manual operation.

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Red-lion TSC User Manual Page 17

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