Emerson Process Management 3000 - Manual (Page 129)

Instruction Manual
Appendix B Rev. 2.2
January 1997
Rosemount Analytical Inc. A Division of Emerson Process Management Appendices B-5
World Class 3000
HEATER DOES NOT HEAT
UP (DOES NOT INCREASE
IN OUTPUT).
SET METER* FOR 50 VAC.
PLACE PROBES ON
TERMINAL BLOCK J2,
“FROM PROBE”, PROBE
HEATER.
METER INDICATES
PULSATING NOMINAL
44 VAC.
DISCONNECT POWER FROM
HPS & PROBE ELECT. SET
METER ON RX1.
MEASURE RESISTANCE OF
HEATER BY PLACING
PROBES ON TERMINAL
BLOCK J2, “FROM PROBE”,
PROBE HEATER.
RESISTANCE MEASURED
SHOULD BE NOMINALLY
12 OHMS.
SET METER TO 250 VAC.
PLACE METER PROBES ON
J2, “FROM ELECTRONICS”,
ANALOG HEATER.
METER SHOULD REGISTER
A PULSATING NOMINAL
115 VAC.
YES
DISCONNECT POWER TO
HPS AND PROBE
ELECTRONICS. CHECK
ALL FOUR FUSES IN HPS.
FUSES BLOWN IN HPS.
NO
NO
CHECK THAT LINE VOLTAGE
IS CORRECT BY SELECTING
CORRECT JUMPERS
ACCORDING TO CHART ON
INSIDE OF HPS COVER.
REPLACE BLOWN FUSES.
HEATER IS OPEN.
REPLACE HEATER.
NO
YES YES
YES
NO
CHECK JUMPER JM2 IS
INSTALLED.
IF FUSES OK, POSSIBLE
PROBE ELECTRONICS TRIAC
FAILURE.
CHECK FUSES IN PROBE
ELECTRONICS.
POSSIBLE TRIAC FAILURE.
REPLACE HPS
MOTHERBOARD.
SYMPTOM
*SIMPSON MODEL 260 OR
EQUIVALENT MULTIMETER.
35730004
Figure B-4. HPS Troubleshooting Flowchart, #1
B