Emerson WORLD CLASS 3000 - Manual (Page 64)

Instruction Manual
Appendix B Rev. 2.2
January 1997
B-4 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management
World Class 3000
In operation, when connected to the CRE 3000
Control Room Electronics, line voltage passes
through the relay (when on) and is converted
into 44 volts by the transformer. If the probe
thermocouple indicates that the probe has
dropped below operating temperature, a signal
from the CRE triggers the triac. The triac then
supplies voltage to the probe heater, warming
the cell. Conversely, if the probe thermocouple
indicates that the probe heater has reached the
upper limit of operating temperature, the CRE
deactivates the triac, shutting off power to the
heater. NOTE
When using the HPS 3000 with an ex-
isting electronics package, such as
Models 218, 218A, 225, or TC200, the
electronics will not have the in-
put/output capacity to support all of
the functions mentioned in this sec-
tion. Refer to Instruction Bulletin IB-
106-300NE.
HPS 3000 TROUBLESHOOTING
B-3 OVERVIEW
The HPS 3000 troubleshooting section de-
scribes how to identify and isolate faults which
may develop in the HPS 3000 assembly.
Install all protective equipment covers
and safety ground leads after trouble-
shooting. Failure to replace covers
and ground leads could result in seri-
ous injury or death.
B-4 HPS 3000 TROUBLESHOOTING
The HPS 3000 troubleshooting may overlap
with the probe in use in the system. Faults in
either system may cause an error to be dis-
played in the electronics package. Figure B-4,
Figure B-5, and Figure B-6 provide trouble-
shooting information.