Installation & Configuration Guide

Thermocouple Adapter for 915U-2

Configuration

On the “I/O Configuration” web page select:

Select Thermocouple type from the drop down list. Options are Type T, Type J, Type K.

Select the Polarity from the drop down list (Normal or

Reversed)

Set Thermocouple Error Value to a value the integer registers (30003 and/or 30004) will go to during fail *

Press “Save and Activate Changes” button.

Thermocouple Range @ Tamb (+10- +40)

* Error Value is set in register 30003 when the thermocouple is open circuit.

* Error Value is set in register 30003 and 30004 when the thermocouple adaptor is not fitted

Thermocouple Range @ Tamb (-40- +60)

Type Normal Reverse

Type T - 25°C to + 365°C - 200°C to + 70°C

Type K - 25°C to + 455°C - 200°C to + 70°C

Type J - 10°C to + 345°C - 210°C to + 60°C

Type

Type T

Type K

Type J

Normal Reverse

0°C to + 330°C - 200°C to + 5°C

0°C to + 410°C - 200°C to + 5°C

15°C to + 300°C - 210°C to + 10°C

PWR

RF

232

485

915U-TCADP

Dip Switches

Installation

915U-TCADP board plugs into the bottom 6 terminals on the 915U-2 terminal strip.

A separate 14 way terminal strip is provided to allow connection to the remaining terminals.

Address locations

38005 = 32 bit Floating Point temperature value

38007 = 32 bit Floating Point Cold Junction value

30003 = Scaled 16 bit Analog value

30004 = Scaled 16 bit Cold Junction value

Connections

Caution:

ESD Sensitive pins. Use ESD handling precautions.

Thermocouple input terminals must be within +/- 5V of the

915U-2 „GND‟ terminal

Analog Input Scale Examples

For normal Polarity setting Zero and Span to 0 and 100 respectively will scale the register to read the temperature as an integer value, e.g. 148.25 °C will read 14825 or 26.51 °C will read 2651

For normal Polarity, setting Zero and Span to 15019 and 682.6667 respectively will scale the register so that a temperature of -10 to

50°C will give a scaled range of 8192 to 49152

For Reverse Polarity, setting Zero and Span to 30948 and 455.106 respectively will scale the register so that a temperature of -50 to

40°C will give a scaled range of 8192 to 49152

Revision 1.6 - Oct 2011

Thermocouple Adapter

-Ve

If „Thermocouple

Polarity‟ selection is reversed

Thermocouple wires must be swapped, e.g. (red) to TC+ &

(blue) to TC-

TC-

Constantan

(red)

+Ve

N/C

N/C

COM

(+24V)

TC+

Copper (blue)

Normal Type “T”

Thermocouple

All Dip Switches must be set to the OFF position.

ELPRO

915U-2

Elpro inst_915U_TC_Adapter_1-6.vsd