Emerson ROSEMOUNT 3000 - Manual (Page 132)

Instruction Bulletin
Appendix B Rev. 2.3
May 2005
B-6 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management
World Class 3000
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
ON BOTH “FROM ELECTRONICS” AND “FROM
PROBE” TERMINAL BLOCKS. (MODELS 218
AND 225 ONLY)
SET METER* ON 250 VAC SCALE.
CHECK “FROM ELECTRONIC”, ANALOG
HEATER TERMINALS IF THERE IS A
PULSATING NOMINAL 115 VAC.
CHECK “FROM PROBE”, TERMINALS AT
PROBE HEATER IF THERE IS A PULSATING
NOMINAL 44 VOLTS.
CHECK PROBE ELECTRONICS SETPOINT
HAS BEEN CHANGED ACCORDING TO
APPLICABLE ELECTRONICS PACKAGE IB.
SET METER* ON 50 VAC SCALE.
CHECK IF PROBE HEATER VOLTAGE
SELECTION JUMPER JM7 INSTALLED
(REMOVE JM8).
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.
IF THE VOLTAGE IS
CONSTANTLY ON, THEN
THE TRIAC MODULE IN
THE HPS IS SHORTED.
NO
NO
NO
YES
YES
YES
SYMPTOM
*SIMPSON MODEL 260 OR EQUIVALENT MULTIMETER. 35730003
Figure B-5. HPS Troubleshooting Flowchart, #2