Operation Manual
Instruction Notes for 3622561, 3622562, 3622563, 3622564
Digital Control Module
Load Fuse
ON / OFF Switch Load Outlet Power Inlet
Grid Support
General Description Sensor Input
This temperature control displays both the setpoint and process temperature and uses the most modern control
technology for the best temperature stability. The Auto-tune feature minimizes setpoint overshoot and learns your
process. Changing your setpoint is easily done with the interface keys. The controller can also perform ramp rate
operations to allow the user to slowly raise the process temperature. There are several input types available. This unit
comes with a 6’ detachable power cord, grid support bracket, which is ideal for fume hood mounting to maximize bench
space. This control is a microprocessor-based, digital indicating, automatic temperature control with a single input and a
single output. It features an auto-tuning function that allows automatic setting of control parameters with a minimum of
user input required. This family of control accepts a type "J", “K”, “T” thermocouple, or RTD (model 3622564) input
depending on the model ordered.
The control automatically sets the PID parameters through a "learning" sequence in the auto-tuning mode. PID
parameters include proportional band, reset/integral and rate/derivative. User-friendly features include automatic LED
indicators to aid in monitoring and setup, as well as dual LED displays for process temperature and set point indication.
This control automatically stores all information in a non-volatile memory.
Control Features
1. On/Off switch.
2. 15-amp output.
3. Control PID with Auto-tune algorithm, solid state relay
4. Circuit protection (fuse)
5. Low profile housing.
6. Safety feature- Output is de-energized if sensing device is unplugged or damaged.
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How to Setup and Operate
First, connect the heater load and the sensor to the load and sensor receptacles on the front panel. Next, plug the control
line cord into an appropriate 3-wire grounded power receptacle. Push the power switch to the "ON" position. Wait five
seconds for the control unit to energize.
The control is shipped from the factory with the display reading in degrees C. If a display in degrees F is desirable, press
the UP/DOWN arrow keys simultaneously for three seconds to access the Setup Page. Press the Advance key until the
Celsius_Fahrenheit parameter [C-F] is shown in the lower display. Press the UP arrow key to change from C to F.
After changing the display, press the Infinity key to display the set point temperature and the process temperature
(temperature at the sensor).
To begin the heating process, use the Up/Down arrow keys to enter the desired set point temperature. This is shown in
the lower display. Auto-tuning is recommended in all applications. Auto-tuning allows the control to set the PID
parameters without those parameters being manually entered/calculated by the user. It also minimizes the amount of
temperature overshoot of the set point and decreases the time required for the process to stabilize. See page 8 for
instruction on performing the auto-tune function.
It is recommended that the auto-tune feature be used every time the process temperature set point has been changed. If
the process is being repeated, the parameters learned in the initial setup are stored in the memory of the control and the
auto-tune process isn’t required to be repeated in most applications.
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Control Sensor
Range Type J:
-200°C to 1200°C
Range Type K:
-200°C to 1370°C
Range Type T:
-200°C to 400°C
Range Type RTD:
-200°C to 800°C
Proper placement of the sensor can eliminate many problems associated in the total operation of the system. The probe
should be placed so that it can detect any temperature change with little thermal lag. In a process that requires fairly
constant heat output, the probe should be close to the heating source. In processes where heat demand is variable, the
probe should be placed close to the work area. Experimenting with probe location should be tried to provide optimum
results for your particular process.
Specifications
Control Mode
- Microprocessor-based, single input, single output.
- PID parameters
Proportional band: 1 to 999o F
Reset: 0.00 to 99.99 repeats per minute.
Integral: 0.00 to 99.99 minutes per repeat.
Rate or Derivative: 0.00 to 9.99 minutes.
Operator Interface
- Advance, Infinity, Up and Down keys, and ON/OFF switch.
- (2) 4 character LED display.
- Thermocouple receptacle and 3 wire load receptacle.
Input
- Type J, K , T thermocouple or (RTD): input grounded or ungrounded.
- Automatic cold junction compensation and break protection for sensor.
- Degrees F or degrees C display; user selectable (preset for degrees C)
Primary Output (Heating or Cooling)
- 15A @ 120VAC or 10A @ 240VAC depending on model
Accuracy
- Calibration accuracy: 0.1% of span.
- Temperature stability: 0.2 oF / oF rise in ambient maximum.
- Voltage stability: 0.01% of span / % of rated line voltage.
Power
- 50/60 Hz 5%
- Data retention upon power failure via nonvolatile memory.
Operating Environment
- 32 to 149 oF / 0 to 65 oC; 0 to 90% RH, non-condensing.
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Setup Menu
09/14 4 Rev.5
09/14 5 Rev.5
Degrees or units per hour
09/14 6 Rev.5
Operations Menu
How to Tune and Operate
Manual operation provides direct (time proportioned % time) control from -100% to 100%. A negative value is allowed
only when Ot 1=Cool. Automatic operation provides sensory feedback ON/OFF or PID control. When the operation
transfers from automatic to manual operation, the power level from automatic operation is retained and restored to the
previous set point.
The % LED indicates manual operation. The LED is on when in Manual operation and off when in AUTO operation.
When the LED is flashing, press the Infinity key again within 5 seconds to complete the change in operation. It the
sensor is open and LOC=0, 1 or 2, the control switches to Manual operation if the output was stable before the break
occurred.
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Tuning-Automatic
It is recommended that auto-tuning be used each time a new process is initiated. If the process is being duplicated, the
parameters learned in the initial auto tune setup are stored in the memory of the control and the auto-tune procedure isn’t
required in most applications.
Auto-tuning: This control can automatically tune the PID parameters to fit the characteristics of your particular thermal
system.
Auto-tune can only be used when Output 1 setting is hEAt and heat algorithm (h.Ag, page 5) is set for PID mode. The
heat algorithm setting is set for PID from the factory. When the auto-tune sequence has started, the lower display will
flash between tun1-attn and the main operation screen.
Changing the set point, while in auto-tune mode, will not change the set point value. The displayed value will change but
the control has locked in the original set point value tell the auto tune in complete or has been turned off by the user. Once
the control has finished "learning" the system, it returns to standard PID control with the values automatically set. Autotuning is complete within 80 minutes. In order for the control to successfully complete auto-tune, the process must cross
the 90% set point value four times within 80 minutes after auto-tune has started. If this does not happen within the 80
minute time limit, Pb1 remains at 0 and the control will operate with the factory default PID values.
To start auto-tuning:
1. Set the set point value with the arrow keys to the desired temperature of operation.
2. Press the Advance key until the Aut prompt appears in the lower display.
3. Change the parameter to YES with the arrow keys.
4. Press the Infinity key to display the set point and sensor temperatures. While the control is in the auto-tuning
mode, the display will alternate between the set point and the "Aut" prompt. When tuning is complete, the lower
display indicates only the set point.
5. When tuning is complete, the lower display indicates setpoint only and Aut reverts to OFF. The control installs
appropriate PID tuning parameters and retains them in the non-volatile memory.
*To abort auto-tuning, the operator must reset Aut to OFF. Auto-tuning may also be aborted by cycling power off and on.
In all cases, aborting auto-tuning restores all original factory default values.
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Indication
Description
Possible Causes
Corrective Action
Sensor does not provide
a valid signal to controller
Sensor improperely wired or open,
Incorrect setting or sensor type, or
Calibration corrupt
Correct wiring or replace
sensor, Match setting to
sensor , or Check
calibration of controller
Controller is autotuning
the control loop
User started the autotune function
Wait until autotune
complests or disable
autotune feature
Controller is ramping to
new set point
Ramping feature is activiated
Disable ramping feature if
not required
Sensor input above high
alarm set point
Temperature is greater than alarm set
point
Check casue of over
temperature, or Set alarm
source to proper setting
Temperature overshoot
In most cases this is due to a small sample size being heated with a high wattage heater. The control is set at the factory
with the Power Scale High Output 1 with a value of 100. This value can be adjusted in the setup menu, reference page 6
for instructions on how to change value. If excessive temperature overshoot is occurring, adjust the value to 50 and start
the heating process from ambient room temperature. If excessive temperature overshoot is still occurring, decrease to a
lower value and repeat heating process from ambient room temperature. If the process temperature never makes it to the
set point temperature value, increase the power scale high output 1 value. This process can take several value changes
to obtain proper temperature control with your particular application setup. It is recommended to initiate the Auto-Tune
process again after the proper power scale high output 1 value has been determined for your application.
Error Code Definitions and Actions:
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GLOSSARY
Automatic prompts: Data entry points where a microprocessor-based control "prompts" or asks the operator for
information input.
Auto-tune: Automatically tunes the parameters to fit the characteristics of your particular thermal system.
Cold junction compensation: Electronic means to compensate for the effect temperature at the cold junction.
Cycle time: The time necessary to complete a full On-through-Off period in a time proportioning control system.
Derivative/Rate: Anticipatory action that senses the rate of change of the process, and compensates to minimize
overshoot and undershoot.
Default parameters: The parameters (programmed instructions) permanently stored in microprocessor software to
provide the data base.
Droop: Difference in temperature between set point and stabilized process temperature.
Hysteresis: In On/Off control, the temperature change necessary to change the output from On to full Off.
Input (sensor): Process variable information being supplied to the instrument.
Integral/Reset: Control action that automatically eliminates offset, or "droop", between set point and actual process
temperature.
Offset: Adjustment to actual input temperature and to the temperature valves the control uses for display and control.
ON/OFF control: Control of temperature about a set point by turning the output full On below set point and full Off above
set point.
Output: Action in response to difference between set point and process variable.
Overshoot: Condition where temperature exceeds steeping due to initial power up or process changes.
Parameter: a physical property whose value determines the response of a electronic control to given inputs.
PID: Proportioning control with auto-reset and rate.
Process variable: Thermal system element to be regulated, such as time, temperature, relative humidity, etc.
Proportional band: Span of temperature about the set point where time proportional control action takes place.
Set point: Intended value of the process variable.
Thermal system: A regulated environment consisting of a heat source, heat transfer medium, sensing device and a
process variable control.
Thermocouple: Temperature sensing device that is constructed of two dissimilar metals wherein a measurable,
predicative voltage is generated corresponding to temperature.
Thermocouple break protection: Fail-safe operation that assures output shutdown upon an open thermocouple condition.
Time Proportioning Control: Action which varies the amount of ON and OFF time when "close" to the set point (within the
proportional band). This variance is proportional to the difference between the set point and the actual process
temperature.
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Digi-Sense
625 East Bunker Court, MS 18
Vernon Hills, Illinois 60061-1844, U.S.A
Phone: 847-549-7600 Fax: 847-549-7676
( 800) 323-4340
Maintenance
Simple preventative maintenance steps include keeping the controller clean. Protect it from overload, excessive dirt, oil
and corrosion.
Warranty
Digi-Sense, for itself does hereby offer a warranty for products from the date of receipt by the user, under normal and
proper usage, against defects in workmanship and materials for 12 months, and will repair or replace any defective
part(s) without charge when same is shipped Prepaid to Digi-Sense from which the product was originally purchased.
Should the nature of any defect require that the product, or any constituent portion thereof, be returned to Digi-Sense,
Vernon Hill, Illinois, prepaid for service, a condition precedent to any return shall be the procurement of authorization from
Digi-Sense assigning a Return Goods Number to the product or part requiring service.
Parts and accessories manufactured by others are warranted only to the extent of the regular warranty of the
manufacturer or supplier of such materials and only insofar as Digi-Sense is able to transfer the benefits of warranty
coverage, if any, to the user. Any adequately warranted defective part or accessory manufactured or supplied by others
may be exchanged through Digi-Sense for a replacement part is shipped prepaid and received at Digi-Sense within 30
days from the date any replacement part is obtained by the user.
This warranty supersedes and is given in lieu of all implied warranties, and is void if the user causes damages from
improper usage of product under normal operating conditions.
12 MONTHS LIMITED WARRANTY ON ALL PARTS AND LABOR IS GIVEN BY DIGI-SENSE.
CATALOG NUMBER 3622561, 3622562, 3622563, or 3622564
SERIAL NUMBER _________
DATE OF PURCHASE _______________
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