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Graphite® Module Calibration

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Red Lion Controls
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Industrial Automation Tech Note 15 - TNIA15

Abstract

This document outlines the procedures for calibrating the inputs and outputs of
Graphite® I/O Modules.

Products

GMPxxxxx, GMINI800, GMINV800, GMOUT400, GMTC8000, GMRTD600,
GMSGxxxx, and GMUIN400

Use Case: Calibrating Graphite® I/O Modules

Step by step procedure to calibrate the inputs and outputs of Graphite® modules.

Required Software:

Crimson 3.0 and 3.1

Required Firmware:

Crimson 3.0 Build 573.001 or higher

Determining Module Number

Modules receive their Module Numbers when they created in Crimson; modules receive the LOWEST AVAILABLE number.

1. Click on the first module in the rack.

2. Record the Device Number that is located in the lower left of the Crimson window, refer to Figure 1.

Fig_1_mod.PNG

Figure 1.

3. Repeat steps 1 & 2 for all modules.

The module with the lowest Device Number is Module 1; the module with the next lowest Device Number is Module 2, etc… Module Numbers may change after a new module is added to the configuration; therefor Module Numbers should be verified prior to ALL calibration procedures.

Input and Heater Current Monitor Calibration

The order in which the calibration inputs are applied does not matter, i.e. when calibrating a 4-20 mA input, one can calibrate for 4 mA, then 20 mA, and then 0 mA. The only order that does matter is when calibrating a thermocouple input; the mV calibration must be done prior to calibrating the Cold Junction.

  1. Connect the Graphite® HMI with the module to be calibrated to the PC, and ensure the correct connection is selected under Link-Options.
  2. Click Link-Calibration.
  3. Select the Module Number, the Model, the Channel (if applicable) to calibrate, and finally the Command.
  4. Using a calibrated source device, apply the Command value to the appropriate channel of the selected module and allow the signal to stabilize for 5-10 seconds.
  5. Click the Read button and make note of the value.
  6. Click the Send
  7. Click the Read The value read back should be very close to the value from step 4. If it is not, verify the input wiring and signal, and repeat the procedure from step 4.

 Repeat steps 3 through 7 for each of the inputs to be calibrated.

 When finished calibrating, select Command Save Calibration to EEPROM and Send.

**The calibration must be saved to EEPROM; or could be aborted by simply removing power**

Cold Junction Calibration 

Cold Junction Calibration is only needed for Thermocouple inputs, and should be performed after the mV calibration procedure

Requires a way to access the PV value of the input that is being calibrated, such as watching a block or tags in Crimson 3.0.

The Graphite® module should be mounted to a Graphite® host device, in the proper orientation, and the front of the module and terminal blocks should be shielded from drafts. Do not enclose the module, such that normal convection is affected.

The setup should be powered up and allowed to stabilize thermally before calibrating the cold junction (30 minutes or more, depending on the environment).

  1. Connect the Graphite® HMI with the module to be calibrated to the PC, and ensure the correct connection is selected under Link-Options.
  2. Click Link-Calibration
  3. Select the Module Number, the Model, the Channel to calibrate, and finally the Command.
  4. Connect the thermocouple to the input to be calibrated.
  5. Place the thermocouple with its tip touching a known calibrated temperature sensor (with display) in the same location. A thermally stable environment, such as a box, is a good idea to ensure that there are no outside forces (drafts etc.) that may cause the 2 probes to record a slightly different temperature reading.
  6. Click Read.
  7. Observe the current setting in hundredths of degrees Celsius.
  8. Change the read value by the amount of error between the PV and the reference temperature sensor, i.e. if it reads 1/2 degree higher than the external source, lower the value by 1/2 degree.
  9. Click Send.

Repeat steps 5 through 7 until the read value matches the external reference.

When finished calibrating, select Command Save Calibration to EEPROM and Send

**The calibration must be saved to EEPROM; or could be aborted by simply removing power**

Analog Output Calibration

  1. Connect the Graphite® HMI with the module to be calibrated to the PC, and ensure the correct connection is selected under Link-Options.
  2. Click Link-Calibration
  3. Select the Module Number, the Model, the Channel to calibrate, and finally the Command.
  4. Connect a calibrated meter to read the output type that is being calibrated.
  5. Click Read and then click Send; the module should output the commanded value.
  6. If the output is not within spec, adjust the read value accordingly, and then click Send.

Repeat steps 5 and 6 until the output is correct.

When finished calibrating, select Command Save Calibration to EEPROM and Send

**The calibration must be saved to EEPROM; or could be aborted by simply removing power**

Disclaimer

It is the customer's responsibility to review the advice provided herein and its applicability to the system. Red Lion makes no representation about specific knowledge of the customer's system or the specific performance of the system. Red Lion is not responsible for any damage to equipment or connected systems. The use of this document is at your own risk. Red Lion standard product warranty applies.

Red Lion Technical Support

If you have any questions or trouble contact Red Lion Technical Support by clicking here or calling 1-877-432-9908.

For more information: http://www.redlion.net/support/policies-statements/warranty-statement

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