Tempco TEC-2500 Instruction Manual

Instruction Manual

TEC-2500
Self-Tune Fuzzy / PID
Process Temperature Controller

Agency Approvals

TEMPCO Electric Heater Corporation
607 N. Central Avenue • Wood Dale, IL 60191-1452 USA
Tel: [phone] • Toll Free: 800-323-6859
Fax: [phone] • E-mail: [e-mail]

Serving Industry Since 1972

Web: www.tempco.com

Manual TEC-2500 Revision 9/2013

NOTES

Warning Symbol

This symbol calls attention to an operating procedure, practice, or
the like which, if not correctly performed or adhered to, could
result in personal injury or damage to or destruction of part or all
of the product and system. Do not proceed beyond a warning
symbol until the indicated conditions are fully understood and met.

Using the Manual

Installers. . . . . . . . . . . . . . . . . . . . . . . . . . . . Read Chapters 1, 2

Basic Function User. . . . . . . . . . . . . . . . . Read Chapters 1, 3, 5

Enhanced Function User . . . . . . . . . . . Read Chapters 1, 3, 4, 5

System Designer . . . . . . . . . . . . . . . . . . . . . . Read All Chapters

Expert User. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Read Page 10

NOTE:

It is strongly recommended that a process should incorporate
a LIMIT CONTROL like TEC-910 which will shut down the
equipment at a preset process condition in order to preclude
possible damage to products or system.

Information in this user’s manual is subject to change without
notice.

Copyright © 2011, Tempco Electric Heater Corporation, all rights
reserved. No part of this publication may be reproduced,
transmitted, transcribed or stored in a retrieval system, or
translated into any language in any form by any means without
the written permission of Tempco Electric Heater Corporation.

CONTENTS

Chapter 1 Overview

1-1 Features . .

1-2 Ordering Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1-3 Programming Port and DIP Switch . . . . . . . . . . . . . 4

1-4 Keys and Displays . . . . . . . . . . . . . . . . . . . . . . . . . 5

1-5 Menu Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1-6 System Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1-7 Parameter Description . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 2 Installation

2-1 Unpacking . .

2-2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2-3 Wiring Precautions . . . . . . . . . . . . . . . . . . . . . . . . 18

2-4 Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2-5 Sensor Installation Guidelines . . . . . . . . . . . . . . . 19

2-6 Thermocouple Input Wiring . . . . . . . . . . . . . . . . . 19

2-7 RTD Input Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 20

2-8 Linear DC Input Wiring . . . . . . . . . . . . . . . . . . . . . 20

2-9 CT/Heater Current Input Wiring . . . . . . . . . . . . . . 21

2-10 Event Input wiring . . . . . . . . . . . . . . . . . . . . . . . . 22

2-11 Output 1 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2-12 Output 2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2-13 Alarm 1 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2-14 Alarm 2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2-15 RS-485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2-16 RS-232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2-17 Analog Retransmission . . . . . . . . . . . . . . . . . . . . 30

2-18 Programming Port . . . . . . . . . . . . . . . . . . . . . . . 31

Chapter 3 Programming Basic Functions

3-1 Input 1 . .

3-2 OUT1 and OUT2 Types . . . . . . . . . . . . . . . . . . . . 34

3-3 Configuring User Menu . . . . . . . . . . . . . . . . . . . . . 35

3-4 Display SV Instead of PV . . . . . . . . . . . . . . . . . . . 35

3-5 Heat Only Control . . . . . . . . . . . . . . . . . . . . . . . . . 36

3-6 Cool Only Control . . . . . . . . . . . . . . . . . . . . . . . . . 37

3-7 Heat-Cool Control . . . . . . . . . . . . . . . . . . . . . . . . . 38

3-8 Dwell Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3-9 Process Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3-10 Deviation Alarms . . . . . . . . . . . . . . . . . . . . . . . . . 42

3-11 Deviation Band Alarms . . . . . . . . . . . . . . . . . . . . 43

3-12 Heater Break Alarm . . . . . . . . . . . . . . . . . . . . . . 44

3-13 Loop Break Alarm . . . . . . . . . . . . . . . . . . . . . . . . 45

3-14 Sensor Break Alarm . . . . . . . . . . . . . . . . . . . . . . 46

3-15 SP1 Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3-16 PV1 Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3-17 Failure Transfer . . . . . . . . . . . . . . . . . . . . . . . . . 48

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Page No.

CONTENTS

Page No.

3-18 Bumpless Transfer . . . . . . . . . . . . . . . . . . . . . . . 49

3-19 Self-tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

3-20 Auto-tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

3-21 Manual Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . 53

3-22 Signal Conditioner DC Power Supply . . . . . . . . . 55

3-23 Manual Control . . . . . . . . . . . . . . . . . . . . . . . . . . 56

3-24 Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

3-25 Heater Current Monitoring . . . . . . . . . . . . . . . . . 58

3-26 Reload Default Values . . . . . . . . . . . . . . . . . . . . . 58

Chapter 4 Full Function Programming

4-1 Event Input . .

4-2 Second Set Point . . . . . . . . . . . . . . . . . . . . . . . . . 60

4-3 Second PID Set . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4-4 Ramp and Dwell . . . . . . . . . . . . . . . . . . . . . . . . . . 62

4-5 Remote Set Point . . . . . . . . . . . . . . . . . . . . . . . . . 63

4-6 Differential Control . . . . . . . . . . . . . . . . . . . . . . . . 64

4-7 Output Power Limits . . . . . . . . . . . . . . . . . . . . . . . 65

4-8 Data Communication . . . . . . . . . . . . . . . . . . . . . . 66

4-9 Analog Retransmission . . . . . . . . . . . . . . . . . . . . . 67

4-10 Digital Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

4-11 Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

4-12 Pump Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

4-13 Remote Lockout . . . . . . . . . . . . . . . . . . . . . . . . . 70

Chapter 5 Applications

5-1 Pump/Pressure Control . .
5-2 Variable Period Full Wave SSR (VPFW SSR) . . . 73

5-3 Heat Only Control . . . . . . . . . . . . . . . . . . . . . . . . . 75

5-4 Cool Only Control . . . . . . . . . . . . . . . . . . . . . . . . . 76

5-5 Heat-Cool Control . . . . . . . . . . . . . . . . . . . . . . . . . 77

5-6 Ramp and Dwell . . . . . . . . . . . . . . . . . . . . . . . . . . 78

5-7 Remote Set Point . . . . . . . . . . . . . . . . . . . . . . . . . 80

5-8 Differential Control . . . . . . . . . . . . . . . . . . . . . . . . 81

5-9 Dual Set Point/PID . . . . . . . . . . . . . . . . . . . . . . . . 82

5-10 RS-485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

5-11 RS-232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5-12 Retransmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Chapter 6 Calibration
Chapter 7 Error Codes and Troubleshooting
Chapter 8 Specifications
Appendix

A-1 Menu Existence Conditions . .

A-2 Factory Menu Description . . . . . . . . . . . . . . . . . 100

A-5 Memo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

A-6 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

. . . . . . . . . . . . . . . . . . 71

. . . . . . . . . . . . . . . . . . . . . . . . 87

. . . . 91

. . . . . . . . . . . . . . . . . . . . . 95

. . . . . . . . . . . . . . . 97

NOTES

Chapter 1 Overview

1–1 Features

Unique

** High accuracy 18-bit input A–D
** High accuracy 15-bit output D–A
** Fast input sample rate (5 times/second)

* Fuzzy plus PID microprocessor-based control
* Automatic programming
* Differential control
* Auto-tune function
* Self-tune function
* Sleep mode function
* "Soft-start" ramp and dwell timer
* Programmable inputs(thermocouple, RTD, mA, VDC)
* Analog input for remote set point and CT
* Event input for changing function and set point
* Programmable digital filter

TEC-2500 Fuzzy Logic plus PID microprocessor-based controller

incorporates a bright, easy to read, 4-digit LED display which
indicates the process value. Fuzzy Logic technology enables a
process to reach a predetermined set point in the shortest time,
with the minimum of overshoot during power-up or external load
disturbance. The units are housed in a 1/32 DIN case, measuring
24mm x 48mm with 98mm behind-panel depth. The units feature
three touch keys to select the various control and input
parameters. Using a unique function, you can put up to five
parameters at the front of the user menu by using SEL1 to SEL5
found in the setup menu. This is particularly useful to OEM's as it
is easy to configure the menu to suit the specific application.

TEC-2500 is powered by 11–26 or 90–264VDC/AC supply,
incorporating a 2 amp control relay output, 5V logic alarm output
and a 2 amp alarm relay output as standard with a second alarm
that can be configured in the second output for cooling purposes
or as a dwell timer. Alternative output options include SSR drive,
triac, 4–20mA and 0–10 volts. TEC-2500 is fully programmable
for PT100, thermocouple types J, K, T, E, B, R, S, N, L, 0–20mA,
4–20mA, and voltage signal input, with no need to modify the
unit. The input signals are digitized by using an 18-bit A to D
converter. Its fast sampling rate allows the TEC-2500 to control
fast processes such as pressure and flow. Self-tuning is
incorporated. Self-tuning can be used to optimize the control
parameters as soon as undesired control results are observed.
Unlike auto-tuning, self-tuning will produce less disturbance to
the process during tuning, and can be used at any time.

** Two function complexity levels
** User menu configurable
** Pump control

* Hardware lockout and remote lockout protection
* Loop break alarm
* Heater break alarm
* Sensor break alarm and bumpless transfer
* RS-485, RS-232 communication
* Analog retransmission
* Signal conditioner DC power supply
* A wide variety of output modules available
* Safety UL/CSA/IEC1010–1
* EMC/CE EN61326
* Front panel sealed to NEMA 4X and IP65

Two different methods can be used to program the TEC-2500.

1. Use the keys on the front panel to program the unit manually or

2. use a PC with setup software to program the unit via the RS­485 or RS-232 COMM port.

For nearly a hundred years, PID control has been used and has
proven to be an efficient controlling method by many industries,
yet PID has difficulty dealing with some sophisticated systems
such as second and higher order systems, long time-lag systems,
during set point changes and/or load disturbances, etc. The PID
principle is based on a mathematical model which is obtained by
tuning the process. Unfortunately, many systems are too complex
to describe precisely in numerical terms. In addition, these
systems may vary from time to time. In order to overcome the
imperfections of PID control, Fuzzy Logic was introduced.

What is Fuzzy Control? It works like a good driver. Under
different speeds and circumstances, he can control a car well
based on previous experience, and does not require knowledge of
the kinetic theory of motion. Fuzzy Logic is a linguistic control
which is different from numerical PID control. It controls the
system by experience and does not need to simulate the system
precisely as a PID controller would.

Digital communications formats RS-485, RS-232 or 4–20mA
retransmission are available as an additional option. These options
allow the TEC-2500 to be integrated with supervisory control
systems and software, or alternatively to drive remote displays,
chart recorders, or data loggers.

1

The function of Fuzzy Logic is to adjust PID parameters
internally in order to make manipulation of output value
MV more flexible and adaptive to various processes.

The Fuzzy Rule may work like this:
If the temperature difference is large, and the temperature
rate is large, then ΔMV is large.

If the temperature difference is large, and the temperature
rate is small, then ΔMV is small.

PID+Fuzzy Control has been proven to be an efficient
method to improve the control stability as shown by the
comparison curves below:

2

1–2 Ordering Code

Accessories

TEC-101-101 — Isolated 4–20mA/0–20mA analog output module
TEC-101-114 — Isolated 1–5V/0–5V analog output module
TEC-101-115 — Isolated 0–10V analog output module
TEC-101-109 — Isolated 1A/240VAC triac output module (SSR)
TEC-101-111 — Isolated 20V/25mA DC output power supply
TEC-101-112 — Isolated 12V/40mA DC output power supply
TEC-101-113 — Isolated 5V/80mA DC output power supply
TEC-102-101 — Isolated RS-485 interface module
TEC-102-103 — Isolated RS-232 interface module
TEC-102-104 — Isolated 4–20mA/0–20mA retransmission module
TEC-102-105 — Isolated 1–5V/0–5V retransmission module
TEC-102-106 — Isolated 0–10V retransmission module
TEC99014 — RS-232 interface cable (2M)
TEC99999 — 0–50amp AC current transformer

Related Products

TEC99001 — Smart network adapter for third party software; converts 255 channels of RS-485 or RS-422 to RS-232 network
TEC99002 — Smart network adapter for BC-Net software; converts 255 channels of RS-485 or RS-422 to RS-232 network
TEC99927 — RS-232/485 ->USB Adapter

3

1–3 Programming Port and DIP Switch

The programming port is used for off-line automatic setup
and testing procedures only. Do not attempt to make any
connection to these pins when the unit is being used for
normal control purposes.

When the unit leaves the factory, the DIP switch is set so
that TC and RTD are selected for input 1 and all parameters
are unlocked.

Lockout function is used to disable the adjustment of
parameters as well as operation of calibration mode.
However, the menu can still be viewed even under lockout
condition.

*SEL1-SEL5 represent those parameters which are
selected by using SEL1, SEL2,...SEL5 parameters
contained in the setup menu. The parameters that have
been selected are then allocated at the beginning of the
user menu.

4

1–4 Keys and Displays

The unit is programmed by using the three keys on the front panel. The available key functions are listed in the following
table.

How to display a 5-digit number:

For a number with a decimal point, the display
will be shifted one digit to the right:

-199.99 will be displayed as -199.9

4553.6 will be displayed as 4553

For a number without a decimal point, the
display will be divided into two alternating
phases:

5

6

1–5 Menu Overview

7

1–6 System Modes

The controller performs closed loop control in its normal control mode condition. The
controller will maintain its normal control mode when you are operating the user menu,
setup menu, or display mode, reloading default values, or applying event input signals.
Under certain conditions, the normal control mode will transfer to an exception mode.
The exception modes include: sleep mode, manual mode, failure mode, calibration
mode, and auto-tuning mode. All of these modes perform in an open loop control except
auto-tuning mode which performs ON-OFF plus PID closed loop control. The mode
transfer is governed by the priority conditions. A lower priority mode can not alter a higher
priority mode, as shown in figure 1.6.

System Modes
Sleep mode:

See section 4-11.

Manual mode:

See section 3-23.

Failure mode:

See section 3-17.

Calibration mode:

See chapter 6.

Auto-tuning mode:

See section 3-20.

Normal control mode:

See section 3-24, 3-26, 4-1

Calibration mode, auto-tuning mode, and normal control mode are in the same priority level. Sleep mode is in the
highest priority level.

8

1–7 Parameter Description

9

10

Low:

Low:

High:

High:

IN2U

DP2

IN2L

IN2H

IN2 Unit Selection

IN2 Decimal Point Selection

IN2 Low Scale Value

IN2 High Scale Value

-19999

-19999

45536

45536

Same as IN1U

Same as DP1

0

1000

2

1

Parameter
Description

Parameter
Description

RangeRange

Default
Value

Contained
in

Contained
in

Basic
Function

Basic
Function

Parameter
Notation

Parameter
Notation

Display
Format

Display
Format

IN1U

IN1

DP1

IN1L

IN1H

IN1 Unit Selection

IN1 Sensor Type Selection

IN1 Decimal Point Selection

IN1 Low Scale Value

IN1 High Scale Value

-19999

-19999

45536

45536

7

13

4

8

14

5

9

0

15

6

10

1

16

7

20

11

17

12

0

0

1

1

2

2

3

N type thermocouple

L type thermocouple

PT 100 ohms DIN curve

PT 100 ohms JIS curve

4 - 20 mA linear current input

0 - 20 mA linear current input

0 - 1V linear Voltage input

0 - 5V linear Voltage input

1 - 5V linear Voltage input

0 - 10V linear Voltage input

Special defined sensor curve

Low:

Low:

High:

High:

0

1000

1

0
(1)

1
( 0 )

IN2

IN2 Signal Type Selection

1

IN2 no function

Current transformer input

0 - 1V linear voltage input

0 - 5V linear voltage input

1 - 5V linear voltage input

0 - 10V linear voltage input

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

:

Degree C unit

Degree F unit

Process unit

No decimal point

1 decimal digit

2 decimal digits

3 decimal digits

Output 1 Function

0

0

OUT1

O1TY

0

1

Reverse (heating ) control action

Direct (cooling) control action

:

:

0

1

2

3

Relay output

Solid state relay drive output

Solid state relay output

4 - 20 mA current module

:

:

:

:

Output 1 Signal Type

Setup
Menu

Perform Event input function

Table 1.4 Parameter Description (page 3 of 7)

11

1213141516

NOTES

Chapter 2 Installation

Dangerous voltage capable of causing death can be present in this instrument. Before
installation or beginning any troubleshooting procedures, the power to all equipment must be switched
off and isolated. Units suspected of being faulty must be disconnected and removed to a properly
equipped workshop for testing and repair. Component replacement and internal adjustments must be
made by a qualified maintenance person only.

To minimize the possibility of fire or shock hazards, do not expose this instrument to rain or
excessive moisture.

Do not use this instrument in areas under hazardous conditions such as excessive shock,
vibration, dirt, moisture, corrosive gases, or oil. The ambient temperature of the areas should not exceed
the maximum rating specified in chapter 8.

2–1 Unpacking

Upon receipt of the shipment, remove the unit from the carton and inspect the unit for shipping
damage.
If there is any damage due to transit, report the damage and file a claim with the carrier.
Write down the model number and serial number for future reference when corresponding with our
service center. The serial number (S/N) is located on the box and the housing of the controller.

2–2 Mounting

Make the panel cutout to fit the dimensions shown in figure 2.1.

Remove both mounting clamps and insert the controller into the panel cutout. Reinstall the mounting
clamps. Gently tighten the screws in the clamp until the controller front panel fits snugly in the cutout.

17

2–3 Wiring Precautions

• Before wiring, check the label to verify the correct model
number and options. Switch off the power while checking.

• Care must be taken to ensure that the maximum voltage
ratings specified on the label are not exceeded.

• It is recommended that the power source for these units
be protected by fuses or circuit breakers rated at the
minimum value possible.

• All units should be installed inside a suitably grounded
metal enclosure to prevent live parts from being
accessible to human hands and metal tools.

• All wiring must conform to the appropriate standards of
good practice and local codes and regulations. Wiring
must be suitable for the voltage, current, and temperature
ratings of the system.

• The "stripped" leads as specified in figure 2.2 below are
used for power and sensor connections.

• Beware not to over-tighten the terminal screws.

• Unused control terminals should not be used as jumper
points as they may be internally connected, causing
damage to the unit.

• Verify that the ratings of the output devices and the inputs
as specified in chapter 8 are not exceeded.

• Electrical power in industrial environments contain a
certain amount of noise in the form of transient voltage
and spikes. This electrical noise can adversely affect the
operation of microprocessor-based controls. For this
reason we strongly recommend the use of shielded
thermocouple extension wire which connects the sensor to
the controller. This wire is a twisted-pair construction with
foil wrap and drain wire. The drain wire is to be attached to
ground at one end only.

2–4 Power Wiring

The controller is supplied to operate at 11–26VAC/VDC or 90–264VAC. Check that the installation voltage corresponds
to the power rating indicated on the product label before connecting power to the controller.

This equipment is designed for installation in

an enclosure which provides adequate
protection against electrical shock. The enclosure
must be connected to earth ground.

Local requirements regarding electrical installation
should be rigidly observed. Consideration should
be given to prevent unauthorized personnel from
gaining access to the power terminals.

18

2–5 Sensor Installation Guidelines

++

11 22 33 44

ONON

12

34

5

8910

11

67

121314

Figure 2.5 Thermocouple Input Wiring

DIP Switch

Proper sensor installation can eliminate many problems in a
control system. The probe should be placed so that it can
detect any temperature change with minimal thermal lag. In
a process that requires fairly constant heat output, the
probe should be placed close to the heater. In a process
where the heat demand is variable, the probe should be
close to the work area. Some experiments with probe
location are often required to find the optimum position.

In a liquid process, the addition of a stirrer will help eliminate
thermal lag. Since a thermocouple is basically a point
measuring device, placing more than one thermocouple in
parallel can provide an average temperature readout and
produce better results in most air-heated processes.

2–6 Thermocouple Input Wiring

The thermocouple input connections are shown in figure

2.5. The correct type of thermocouple extension lead-wire
or compensating cable must be used for the entire distance
between the controller and the thermocouple, ensuring that
the correct polarity is maintained throughout. Joints in the
cable should be avoided, if possible.

The proper sensor type is also a very important factor in
obtaining precise measurements. The sensor must have the
correct temperature range to meet the process
requirements. In special processes, the sensor might have
additional requirements such as leak-proof, anti-vibration,
antiseptic, etc.

Standard sensor limits of error are ±4°F (±2°C) or 0.75%
of sensed temperature (half that for special) plus drift
caused by improper protection or an over-temperature
occurrence. This error is far greater than controller error
and cannot be corrected on the sensor except by proper
selection and replacement.

If the length of the thermocouple plus the extension wire is
too long, it may affect the temperature measurement. A 400
ohms K type or a 500 ohms J type thermocouple lead
resistance will produce approximately 1°C temperature
error.

The color codes used on the thermocouple extension leads are shown in Table 2.1.

Table 2.1 Thermocouple Cable Color Codes

Thermocouple Cable British American German French

Type Material BS ASTM DIN NFE

T

J

K (Ni-Cr)

R Pt-13%Rh, Pt
S Pt-10%Rh, Pt

B

Copper (Cu)
Constantan (Cu-Ni)

Iron (Fe)
Constantan (Cu-Ni)

Nickel-Chromium

Nickel-Aluminum
(Ni-Al)

Pt-30%Rh
Pt-6%Rh

+ white + blue + red + yellow
– blue – red – brown – blue
* blue * blue * brown * blue
+ yellow + white + red + yellow
– blue – red – blue – black
* black * black * blue * black

+ brown + yellow + red + yellow
– blue – red – green – purple
* red * yellow * green * yellow

+ white + black + red + yellow
– blue – red – white – green
* green * green * white * green

Use + grey + red Use

Copper – red – grey Copper

Wire * grey * grey Wire

* Color of overall sheath

19

2–7 RTD Input Wiring

The RTD connections are shown in figure 2.6, with the compensating lead connected to terminal 9. For
two-wire RTD inputs, terminals 9 and 10 should be linked. A three-wire RTD offers the capability of lead
resistance compensation, provided that the three leads are the same gauge and equal in length.

For the purpose of accuracy, two-wire RTD should be avoided if possible. A 0.4ohm lead resistance in a
two-wire RTD will produce 1°C temperature error.

2–8 Linear DC Input Wiring

DC linear voltage and linear current connections for input 1 are shown in figure 2.7 and figure 2.8.

DC linear voltage and linear current connections for input 2 are shown in figure 2.9 and figure 2.10.

20

2–9 CT/Heater Current Input Wiring

21

2–10 Event Input wiring

The event input can accept a switch signal as well as an open collector signal. The event input function (EIFN) is
activated when the switch is closed or an open collector (or a logic signal) is pulled down.

Modification from RS-232 to event input:

Because of the limited number of pins, pin 11 is used for both event input and RS-232. If you want to change function of
the TEC-2500 from RS-232 to event input, you must modify jumpers J51 and J52 on the CPU board by opening jumper
J52 and shorting jumper J51. Refer to section 2-16 for the location of jumpers J51 and J52.

Also refer to section 4-1 for event input functions.

2–11 Output 1 Wiring

Figure 2.14 continued on next page

22

2–11 Output 1 Wiring (Continued)

23

2–12 Output 2 Wiring

120V/240V
Mains Supply

120V/240V
Mains Supply

Max. 2A
Resistive

Max. 2A
Resistive

LoadLoa d

120V /240V
Mains Supply

120V /240V
Mains Supply

No Fuse
Breaker

No Fuse
Breaker

Three
Phase
Heater
Power

Three
Phase
Heater
Power

Three Phase
Delta
Heater
Load

Three Phase
Delta
Heater
Load

ContactorContactor

12

34

5

8910

11

67

121314

12

34

5

8910

11

67

121314

Relay Output Direct Drive

++

++

__

__

SSRSSR

12

34

5

8910

11

67

121314

Load

120V / 240V
Mains Supply

+

++

5V5V

0V0V

66

55

333 3

333 3

Internal Circuit

30mA/5V
Pulsed
Voltage

Figure 2.15 Output 2 Wiring

Relay or Triac (SSR)
Output to Drive
Contactor

Pulsed Voltage to Drive SSR

24

25

120V/240V
Mains Supply

120V/240V
Mains Supply

Max. 2A
Resistive

Max. 2A
Resistive

5V DC
Relay

5V DC
Relay

5V DC
Relay

5V DC
Relay

120V /240V
Mains Supply

120V /240V
Mains Supply

No Fuse
Breaker

No Fuse
Breaker

Three
Phase
Heater
Power

Three
Phase
Heater
Power

Three Phase
Delta
Heater
Load

Three Phase
Delta
Heater
Load

ContactorContactor

12

34

5

8910

11

67

121314

12

34

5

8910

11

67

121314

LoadL o a d

Internal C ircuitInterna l C irc uit

++

5V5V

1414

77

1K1K

0V0V

Single Phase Load

Single Phase Load

Figure 2.16
Alarm 1 Wiring

2–13 Alarm 1 Wiring

26