Watlow MICRODIN Bedienungsanleitung PDF herunterladen (Seite 86)

6.6 Watlow MicroDIN

Operations

Note: For information on writing Modbus

™

RTU

communications software for MicroDIN, see the

Appendix.

To enter the calibration mode, first enter the

diagnostics mode; send value 1789 to register

1512. Once in Diagnostics mode, to enter

calibration mode, send 1415 to register 1600.

To restore factory calibrations settings, send value 1

to register 1601.

Thermocouple Input Procedure

Equipment Required

• Type J reference compensator with reference

junction at 32°F/ 0°C, or type J thermocouple

calibrator set at 32°F / 0°C.

• Precision millivolt source, 0-50mV minimum range,

0.002mV resolution.

Setup and calibration

1) Connect voltage to MicroDIN Terminals 9, 10.

2) Connect the millivolt source to Terminal #1 (+) and

Terminal #2 (-) on the MicroDIN with copper wire.

3) Enter 0.000mV from the millivolt source to the

MicroDIN. Allow at least 10 seconds to stabilize.

• Send value 1 to register 1603 to store 0.000mV

input.

4) Enter 50.000mV from the millivolt source to the

MicroDIN. Allow at least 10 seconds to stabilize.

• Send value 2 to register 1603 to store 50.000mV

input.

5) Disconnect the millivolt source and connect the

reference compensator or T/C calibrator to terminal

#1 (+) and Terminal #2 (-).With Type J t/c wire, if

using a compensator, turn it on and short the input

wires. When using a Type J calibrator, set it to

simulate 32°F / 0°C. Allow 10 seconds for the

control to stabilize.

• Send register 1603 value 3 to store CJC input

(32°F, type J, compensated).

6) Rewire for operation and verify calibration.

RTD Input Procedure

Equipment Required

• 1KΩ precision decade box with 0.01Ω resolution

• Precision current source, 0-4mA range with

0.01mA resolution

Setup and calibration

1) Connect voltage to terminals #9, #10.

Short terminals 1, 2 and 3 together with less than 0.1Ω.

• Send register 1603 value 4 to store ground input.

Short terminals 1 and 3 together with less than 0.5Ω.

• Send register 1603 value 5 to store RTD lead

resistance.

4) Connect the decade box to terminals #1, #2 and #3

on the MicroDIN. Use 20 to 24 gauge copper wire.

5) Enter 15.00Ω from the decade box to the MicroDIN.

Allow at least 10 seconds to stabilize.

• Send value 6 to register 1603 to store 15.00Ω.

6) Enter 380.00Ω from the decade box to the

MicroDIN. Allow at least 10 seconds to stabilize.

• Send register 1603 value 7 to store 380.00Ω.

7) Disconnect the decade box, and connect the current

source to Terminals #2 (-) and #3 (+).

Enter 4.00mA from the current source to the

MicroDIN. Allow at least 10 seconds to stabilize.

• Send value 10 to register 1603 to store 4mA input.

9) Rewire for operation and verify calibration.

10123456789

24V‡ (ac/dc)

10123456789

24V‡ (ac/dc)

10123456789

Ω

General Radio Model #1433-T

10123456789

Calibrating MicroDIN

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