Emerson World Class 3000 Manual de instrucciones descargar pdf (Pagina 77)

Instruction Manual

Appendix AX Rev. 2.1

February 1998

Rosemount Analytical Inc. A Division of Emerson Process Management Appendices A-9

World Class 3000

P00009A

CHECK HEATER FUSE AND TRIAC

OUTPUT TO HEATER.

HEATER MAY BE DEAD. THERMOCOUPLE

MAY BE READIN STACK TEMPERATURE.

HEATER, THERMOCOUPLE AND

CONTROL ARE SATISFACTORY.

REFER TO HEATER POWER

SUPPLY TROUBLESHOOTING.

IS IT HIGHER,

LOWER, OR

ZERO?

LOWERHIGHER

ZERO

YES

HEATER

THERMOCOUPLE

CIRCUIT

OPEN?

YES

REPLACE CONTACT

AND THERMOCOUPLE

ASSEMBLY

ALLOW ADDITIONAL TIME

FOR TEMP CONTROL TO

SETTLE.

COLD JUNCTION TEMP

AT ELECTRONICS BOX

MAY BE MUCH LOWER

THAN 25°C (77°F).

CHECK THERMOCOUPLE MV

AT TERMINALS 3 AND 4 IN

PROBE JUNCTION BOX.

IS IT ABOUT SETPOINT MV ±0,2 MV?

[THE MV MEASURED IS NOT YET COLD.

JUNCTION COMPENSATED, SO IT WILL

VARY BY -0,022 MV PER DEGREE

FAHRENHEIT RISE IN THE

TEMPERATURE OF THE ELECTRONICS

BOX LOCATION. NORMAL IS SETPOINT

MV AT 25°C (77 ).]°F

CONFIRM MV VALUE ON

ELECTRONICS UNIT. IF OK,

RESOLVE DIFFERENCE

BETWEEN VOLTMETER AND

ELECTRONICS.

CHECK HEATER CONDITION.

TURN OFF POWER. RESISTANCE

BETWEEN TERMINALS 7 AND 8

SHOULD BE 11-14 OHMS.

RESISTANCE BETWEEN TERMINALS

6 AND 7 AND 6 AND 8 SHOULD

BE OPEN CIRCUIT. IF FAILED,

REPLACE STRUT.

Figure A-9. Flowchart of Probe Related Problems, #2

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 157 158

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Emerson World Class 3000 Manual de instrucciones Pagina 77

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