EUTECH INSTRUMENTS Digi-Sense 68900-01, Digi-Sense 68900-03 Instruction Manual
Digi –Sense ®
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TABLE OF CONTENTS
Title Page
SAFETY PRECAUTIONS ...................................................................... 1
INTRODUCTION.................................................................................... 2
APPLICATION DATA .............................................................................. 3
DESCRIPTION....................................................................................... 3
GENERAL ......................................................................................... 3
CONTROL PANEL DESCRIPTION .................................................. 4
Vacuum Fluorescent Readout ......................................................4
UP, DOWN, LEFT Arrows ............................................................ 4
MENU Key ................................................................................... 4
SET Key ....................................................................................... 5
ALARM Key .................................................................................. 5
TUNE Key .................................................................................... 5
RUN/STOP Key............................................................................ 5
HEAT, COOL, TUNE LED Annunciators ...................................... 5
How To Use This Product ............................................................. 5
INSTALLATION ...................................................................................... 6
INITIAL HARDWARE SETUP ...........................................................6
SETUP PROCEDURE ...................................................................... 8
Thermocouple .............................................................................. 8
Temperature Scale ....................................................................... 9
Alarm Selections .......................................................................... 9
HI Alarm ................................................................................ 10
LO Alarm .............................................................................. 11
HILO Alarm ........................................................................... 11
Alarm Hysteresis................................................................... 12
Audible Alarms ........................................................................... 13
Advanced Set-Up ....................................................................... 13
Sensor Calibrate ........................................................................ 13
Over Temp Stop ......................................................................... 14
Loop Break Stop ........................................................................ 14
Control Action ............................................................................ 15
Control Mode ............................................................................. 15
Control Mode On/Off............................................................. 16
PID - Proportional Band, Integral and Derivative .................. 16
AUTO Tune ........................................................................... 16
Proportional Band ............................................................ 17
Integral Time .................................................................... 17
Derivative Rate ................................................................ 18
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TABLE OF CONTENTS (Continued)
Title Page
Cycle Time ................................................................................. 18
Run Time.................................................................................... 18
Power Up Control ....................................................................... 19
OPERATION ........................................................................................ 20
RUN MODE..................................................................................... 20
TROUBLESHOOTING AND MAINTENANCE ..................................... 21
TROUBLESHOOTING .................................................................... 21
CALIBRATION ................................................................................ 21
MAINTENANCE/CLEANING........................................................... 21
SPECIFICATIONS ............................................................................... 22
INPUTS ........................................................................................... 23
OUTPUTS ....................................................................................... 23
WARRANTY......................................................................................... 24
PRODUCT RETURN............................................................................ 24
TECHNICAL ASSISTANCE ................................................................. 24
APPENDIX A - SETUP MODE .......................................................... A-1
APPENDIX B - ERROR MESSAGES/CORRECTIVE ACTION ......... B-1
ACCESSORIES ...................................................................BACK PAGE
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SAFETY PRECA UTIONS
DANGER: There are no user-serviceable parts in this instru-
ment. Do not remove cover, as high voltages exist
inside the unit. Refer ser vicing to your dealer.
DANGER: If thermocouples are at a high voltage, this voltage
will be present at other points inside the unit.
DANGER: For continued fire protection, replace fuse only with
a fuse of the specified current, voltage, and type.
Remove power cord from wall socket before checking or replacing a fuse. High voltages exist on fuse
terminals.
WARNING: To avoid electric shock, the power cord protective
grounding conductor must be connected to earthground.
W ARNING: Install an independent temperature limit control pro-
tection system where a fault condition could result
in fire or other hazard. Failure to install such a system could result in injury to personnel or damage to
property.
Trademarks bearing the ® symbol in this publication are registered in the U.S. and in other countries.
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INTRODUCTION
This manual provides information for installing and operating the Temperature Controller (standard model).
Refer to Figure 1 for a view of the front panel of the Temperature Controller.
Refer to Figures 2 and 3 for a view of the back panels of the 115 or 230 V
versions.
FIGURE 1. TEMPERATURE CONTROLLER
FIGURE 2. TEMPERATURE CONTROLLER, BACK PANEL
(115 V MODEL)
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FIGURE 3. TEMPERATURE CONTROLLER, BACK PANEL
(230 V MODEL)
APPLICATION DATA
Applications for the Temperature Controller include heating and cooling of
solids, liquids, and gases. For all applications, there are certain set-up operations that should be made carefully to assure optimum and safe performance.
The power and type of heater, the positioning of the sensor, the amount of
thermal insulation, the flash point of the heated material and the many controller set-up menu options are among the many variables to be considered in
setting up the controller.
One of the most important of these considerations is the heater sizing. A heater
that is too low powered may not be able to raise or even maintain the material at
the desired set point. A heater that is too high powered will not maintain precise
temperature control and may be unsafe. Because of the many system variables, optimum heater sizing must be determined experimentally; however, an
approximation can be made through a few calculations. These calculations are
included in a software program available from your dealer.
DESCRIPTION
GENERAL
The Temperature Controller is designed to maintain a constant, pre-set process temperature. It uses a temperature sensor to detect the temperature of
the process. Using a microprocessor software algorithm, it adjusts a heater or
cooler by varying the output duty cycle. The Temperature Controller is a singleloop controller intended for laboratory or industrial applications. The unit can
control loads of up to 10 amperes (A).
The Temperature Controller is housed in a rectangular metal enclosure, with
plastic bezels on the front and back. All connections are made on the rear of
the unit. The display and keypad are on the front. A bail bar, or tilt stand, is
used to elevate the front display panel for easy viewing and operation. The
unit can also be mounted in a panel with the use of an optional panel mount
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kit. A two-line, 16-character, 14-segment vacuum fluorescent display is used
for display of operating, setup, and alarm parameters.
A number of accessories can be used with this Temperature Controller, including various types of temperature sensors, heating units, cooling units (such as
fans or pumps), remote alarms, and recorders.
CONTROL PANEL DESCRIPTION
Refer to Figure 4 and the following paragraphs.
Indicator
Lights
UP and
DOWN
Arrows
Function Control Keys
Alarm LED
FIGURE 4. FRONT PANEL DISPLAYS
Readout Display
LEFT Arrow
Vacuum Fluorescent Readout
The vacuum fluorescent readout displays operation and setup parameters.
Alarm conditions are also displayed.
UP, DOWN, LEFT Arrows
The UP and DOWN arrow keys will increment or decrement the current
values of displayed (blinking) numerals or enable you to scroll through a list
where multiple-choice parameters are offered. The LEFT arrow key allows
you to change numeric settings by moving the blinking cursor left to the next
most significant digit. When you have reached the most significant digit
(furthest left), the LEFT arrow key will move the flashing cursor back to the
least significant digit (furthest right).
MENU Key
The MENU key allows you to access all of the user-configurable setup parameters of the temperature controller. Pressing the MENU key will scroll
through the parameter options, using the arrow keys to change those parameters. Refer to the Setup Procedure section for additional information
on each parameter.
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SET Key
The SET key allows you to change the control setpoint (SP), using the arrow
keys. Pressing the SET key again will exit the setpoint mode.
ALARM Key
The ALARM key enables you to acknowledge temperature control alarm conditions and silence the audible alarm. Pressing the ALARM key will erase
any alarm messages on the display and stop the ALARM from flashing. If the
alarm condition is still present, the ALARM LED will remain on until the PV
(process variable) is out of the alarm condition.
Refer to Setup Procedures for additional information on setting the appropriate alarms.
TUNE Key
The TUNE key will start an AUTO tune cycle. Heat (or cooling) is automatically applied to determine PID values. AUTO tuning must be enabled in the
setup mode for this key to function. Refer to the AUTO Tuning section for
additional information on this setting.
NOTE: When the TUNE key is pressed, the output is turned full on three
times for a period of time and overshoot of the setpoint will occur.
Do not use the AUTO tune feature if this would have an adverse
affect on your process.
RUN/STOP Key
Pressing this key when the Temperature Controller is stopped will start the
control process and activate the load, if required. Pressing this key when the
Temperature Controller is running will cause it to stop.
HEAT, COOL, TUNE LED Annunciators
These three indicators will light to indicate Temperature Controller functions.
The green HEAT light will turn on when power is being applied to the heater
output. The green COOL light will turn on when the Temperature Controller is in
the cooling mode and power is applied to the cooler output. The yellow TUNE
light will turn on when the Temperature Controller is in the AUTO tuning mode.
How to Use this Product
Here is a summary of the steps required to setup and operate the Temperature Controller.
1. Install the unit.
Setup your process.
Plug the Controller power cord to an AC outlet, turn unit on.
Plug the heater (or cooler) into the Controller rear panel and install in
your process.
Connect a thermocouple sensor to the rear panel and install in your
process.
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2. Setup the operating parameters. Press MENU and follow the interactive
setup selections. If your setup is the same as the factory set defaults,
this step is not necessary. However, each of the setup options should be
checked for desired or proper setting.
Set sensor type that was connected.
Select temperature scale.
Set alarms, if desired.
Calibrate system, if better accuracy is desired.
Set safety stops (over temperature and loop break).
Select control action and mode desired (PID or on/off).
Set max. run time.
3. Set the run temperature and begin controlling.
Press the SET key and enter the desired setpoint temperature.
Press TUNE if autotune is selected in setup and you want to automati-
cally determine the PID settings.
Press the RUN/STOP key to begin temperature control.
The setpoint (SP) temperature and the actual temperature (or process
variable, PV) are displayed.
Press ALARM to acknowledge an alarm condition.
INSTALLATION
INITIAL HARDWARE SETUP
1. Remove controller from packaging. Keep all packing material until proper
operation has been verified.
2. Use the "bail" bar (or tilt-stand) at the bottom of the unit to adjust position
for easy viewing of front panel.
WARNING: To avoid electric shock, the power cord pro-
tective grounding conductor must be connected to earth-ground.
WARNING: Install an independent temperature limit con-
trol protection system where a fault condition
could result in fire or other hazard. Failure to
install such a system could result in injury to
personnel or damage to property.
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