Process Technology DE20 Instruction Manual

DE20 Instruction Manual

TABLE OF CONTENTS

DE20 Digital Temperature Control

7010 Lindsay Drive • Mentor, Ohio 44060 • Phone: [phone]

USA/CN: 800-621-1998 • Fax: [phone] • www.process-technology.com

Specifications....................................................................1

General Description.........................................................2

Installation Procedure.....................................................2

Overtemperature Protection...........................................3

Set Point & Features.........................................................4

Alarm Feature.....................................................................4

Error Conditions................................................................4

Error Messages.................................................................4

Power and Relay Wiring....................................................5

2 Wire RTD Sensor Calibration.......................................6

Resistance Signal Calibration.......................................7

3 Wire RTD Calibration..................................................7

Thermocouple Calibration.............................................8

Voltage Signal Calibration..............................................8

Current Input Calibration.................................................9

Frequency Signal Calibration.....................................10

Configuration (Setup)....................................................10

Main Menu Summary.....................................................10

Sensor Type (U1).............................................................11

Signal Offset (U2)...........................................................11

Signal Filter Setting (U4)..................................................11

Set Point Dead Band (U5) .........................................12

Display Stabilizer (U8)...................................................12

Set Point Limit (L)..........................................................12

Heating or Cooling Switch (F2).....................................12

Alarm On/Off Switch (F3)..............................................13

Unit Display Enable (F4)..................................................13

Temperature Unit s Conversion (F5)............................13

Sensor DIP Switch Settings........................................13

Electrical Noise and Interference.................................13

Illustration of a Typical Heater Installation in a

Process Tank ...................................................................14

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flame ignition systems or electrostatic precipitators are in the vicinity of the control. A more common source of
interference occurs when the control is switching inductive loads such as contactor coils, solenoids or
motors. The collapse of the magnetic field when loads such as these are switched off can create an electrical
“spike” that can cause a malfunction of the microprocessor used in the control. Even if the control doing the
switching is unaffected, a nearby control may be affected. To eliminate or minimize this problem, transient
suppressors or “snubbers” can be employed across the inductive load.

Illustration of a Typical Heater Installation in a Process Tank

CONSULT INST ALLA TION AND MAINTENANCE INFORMA TION FOR SPECIFIC INSTRUCTIONS

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2 wire- 1000 ohm RTD TCR (alpha),

0.00385 ohm/ohm/°C
RTD Self Heating Coefficient:

5° C/w in 0.2 m/s water; 200° C/w in
1 m/s air measurement current, 0. 1 to 0.2 mA

-40 to 1000°F (-40 to 538°C)
°F or °C field selectable

Set Point Range

Selectable throughout the input range
De-energize control output (No sensor short
protection with Thermocouple sensor)

Accuracy

± 0.25% span, ± 1 digit
Type 12, IP55
Face suitable for panel mounting
(#20 ga. through 1/4 thick panels)

Display

4 digit, (1/2" nominal), LED display screen

Control Function

ON/OFF Electromechanical Relays

SP1 Set Point

(reverse acting) SPDT 20A resistive@240 VAC max
1HP@240 VAC max, 1/2 HP@120VAC
Field adjustable
1° (F or C) to 99°

Memory

Nonvolatile

Supply Voltage

100 to 240 V~ ± 10%, 50-400 Hz, 13VA

• Indoor Use Only

• -20 to 140°F (-33 to 60°C)

• Max Altitude: 3000m

• Max Relative Humidity: 80%

• Pollution Degree 2
RTD 2 & 3-wire 100 ohm 0.00385 ohm/ohm/ºC or

0.00392 ohm/ohm/ºC
Thermocouples - (types J, K, T, R)
NIST Monograph 175, revision ITS-90
Current 4-20mA DC
Voltage (1-10 VDC)
Frequency (0-200 Hz, counts/second),
+/- 6 VDC p to p (up to 30VDC peak with Sw2 ON)

DE20 Specifications

Control Outputs

Standard Input

Input Range

Sensor Break or
Short Protection

Enclosure

ON/OFF
Differential

Operating
Conditions

Input Options

Equipment protected throughout by Double Insulation or Reinforced Insulation.

-2-

Description

The DE20 digital temperature control is a micropro­cessor based device that operates one relay. The
relay’s contact state is indicated as SET POINT on the
front panel.

The temperature sensor (i.e. RTD or thermocouple)
sends a signal to the DE20 controller. The DE20 com­pares this signal to a value, determined by the operator
and set in the control’s memory for the SET POINT. In
the heating mode if the sensor signal is lower than the
set point value, the DE20 energizes the relay and its
isolated contacts close.

The DE20 is also equipped with an “ALARM CONDI­TION” feature. This feature is activated by using the
“F3” parameter (described on page 13). The DE20
enters an “ALARM CONDITION” any time the sensor
signal has exceeded the ALARM SET POINT. Under
this condition, the DE20 de-energizes the relay and
the letters “AAA” flash on the LED display.

Installation

Suitable for indoor use only.
Unpack and inspect the controller for damage upon

receipt. Any shipping damage claims must be made
through the freight carrier that delivered the controller.
Remove the rear cover and inspect the controller for
internal damage.

Remove the panel retaining collar by inserting a flat
head screwdriver under the collar on alternating sides
while sliding the collar back.

Retaining collar

Retaining
collar screws

Cut a 1/8 DIN finished opening: 1.750"
x 3.625" (44 mm x 92 mm) in the panel
where the DE20 is to be mounted.

Remove the rear cover. Select from the four (4) knock­outs on the rear cover that which offers the most con­venient routing for external wiring. Remove the knock­outs before reattaching the rear cover or inserting the
control in the panel.

Insert the DE20 through the prepared opening and slide
the retaining collar over the case from the rear of the
panel. After hand tightening the collar , tighten the two (2)
collar screws to ensure a secure fit.

Install a suitable liquid tight conduit fitting through the
knockout opening following manufacturer’s instruc­tions and install field wiring. Using the wiring dia­gram supplied with the controller, install the required
input and output wires. Use National Electric Code
and local codes for determining wire sizing, insula­tion, terminations, etc.

3/16 (4.6)

2 5/8

(66.6)

This setting may be a zero (0) or a one (1). When set to zero, the alarm set point is turned off. When set to one,
alarm set point is turned on.

Note: The default value for this setting is zero (0).

This setting may be set to a zero (0) or a one (1). When set to one (1), the DE20 will display either a “C” or an
“F”, separated by a decimal point. This indicates that either Celsius or Fahrenheit is being displayed. If the
temperature being measured is greater than +999 degrees, the units are not shown because the display is
limited to four positions.

This setting may be set to a zero (0) or a one (1). When set to a zero (0), the temperature is displayed in
degrees Fahrenheit. When set to a one (1), the temperature is displayed in degrees Celsius.

Conversion from F to C does NOT change set point or alarm upper limit values. These must be changed
manually.

Note: The default setting is zero (0).

Not available.

When using the sensor 5415 board, an “on-board” DIP switch must also be configured. The DIP switch
settings are as follows:

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F3, Alarm On/Off Switch

F4, Unit Display Enable Flag

F5, Temperature Units Conversion

F6, Current Output Enable Flag

Sensor DIP Switch Settings

Sensor DIP Switch:

Selections

Sw1 Sw2 Sw3 Type
O FF O FF O FF 1000 ohm RTD
ON O F F OF F 100 ohm RTD
OFF ON OFF voltage
OFF OFF ON current
O FF OFF OFF frequency

(Illustration shows DIP switch setting for 100 ohm RTD.)

Electrical Noise and Interference

Process Technology electronic controls are engineered, tested and manufactured to conform to Europe’s CE
levels of electrical noise and interference found in typical industrial installations. It is always possible for
electrical noise and interference to exceed the level of designed-in protection. This can happen, for example,
if arc or spot-welding equipment is close to the control or if they share a common power line. It can occur if

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WARNING: Avoid damaging DE20
components. Remove rear cover before
removing knockouts with a hammer/punch.

UU

UU

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