Emerson 3000 instruction manual World Class, Instruction Bulletin, Symptom, B-6Appendices

Instruction Bulletin

Appendix B Rev. 2.3 May 2005

World Class 3000

SYMPTOM

HEATER OVERHEATS.

NOTE: ON INITIAL STARTUP THE TEMPERATURE OF THE PROBE MAY OVERHEAT TO A NOMINAL TEMP OF 800°C.

CHECK IF THE YELLOW WIRE IS CONNECTED
TO POSITIVE AND THE RED TO NEGATIVE	NO
ON BOTH “FROM ELECTRONICS” AND “FROM
PROBE” TERMINAL BLOCKS. (MODELS 218
AND 225 ONLY)

SET METER* ON 250 VAC SCALE.

CHECK “FROM ELECTRONIC”, ANALOG	NO
HEATER TERMINALS IF THERE IS A
PULSATING NOMINAL 115 VAC.

CONNECT THE WIRING ACCORDING TO THE DECALS ON THE TERMINAL COVERS.

IF THE VOLTAGE IS CONSTANTLY ON, THEN THE TRIAC IN THE PROBE ELECTRONICS IS SHORTED.

YES

SET METER* ON 50 VAC SCALE.

CHECK “FROM PROBE”, TERMINALS AT PROBE HEATER IF THERE IS A PULSATING NOMINAL 44 VOLTS.

YES

CHECK PROBE ELECTRONICS SETPOINT HAS BEEN CHANGED ACCORDING TO APPLICABLE ELECTRONICS PACKAGE IB.

NO

IF THE VOLTAGE IS CONSTANTLY ON, THEN THE TRIAC MODULE IN THE HPS IS SHORTED.

YES

CHECK IF PROBE HEATER VOLTAGE SELECTION JUMPER JM7 INSTALLED (REMOVE JM8).

*SIMPSON MODEL 260 OR EQUIVALENT MULTIMETER. 35730003

Figure B-5. HPS Troubleshooting Flowchart, #2

B-6 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management