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ROC800-Series Instruction Manual

6-12

Inputs and Outputs

Revised Jul-14

7.

Select

Configure

>

I/O

>

RTD Points

. The RTD Input screen

displays.

8.

Disconnect the RTD and connect one jumper between the – terminal

and RET and another jumper between the + terminal and the REF of

the RTD module.

9.

Connect either an accurate resistor or decade resistance box with a

value to give a low end reading across the + and – terminals.

Note

:

Use the temperature-to-resistance conversion chart to

determine the resistance value required for the type of RTD

being used.

10.

Verify that the Raw A/D Input value changed and reflects the

Adjusted A/D 0% value.

11.

Change the resistance to reflect a high temperature as determined by

the temperature-to-resistance conversion chart.

12.

Verify that the Raw A/D Input value changed and reflects the

Adjusted A/D 100% value.

13.

Remove the test equipment, and reconnect the field device.

6.3.10 Troubleshooting Thermocouple Input (T/C) Modules

Note

:

The TC2 module is

not supported

in the Series 1 ROC800 CPU.

Many digital multimeters can generate and measure thermocouple (T/C)

signals. Check the manufacturer’s documentation for your multimeter to

see if it supports thermocouples and how to correctly use the feature if so

equipped. You may require an optional T/C adaptor to use the multimeter.

To test a thermocouple, do not parallel the voltage meter on a

thermocouple that is connected to a ROC800, as it will distort the signal.

Do not try to verify a thermocouple that is connected and actively being

monitored by a ROC800 by measuring the voltage at the ROC800

terminal blocks.

It is suggested that you independently verify the process temperature, by

using a certified thermometer in an adjacent thermowell, and then

compare it to what the ROC800 is reading.

Equipment Required

:

Multimeter

PC running ROCLINK 800 software