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Instruction Manual
Appendix E Rev. 4.5
June 1999
E-8 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management
World Class 3000
SERVICE AND NORMAL MAINTENANCE
E-5 OVERVIEW
This section describes service and routine
maintenance of the Intelligent Field Transmitter.
Replacement parts referred to are available
from Rosemount. Refer to Replacement Parts
later in this appendix for part numbers and or-
dering information.
Install all protective equipment covers
and safety ground leads after equip-
ment repair or service. Failure to in-
stall covers and ground leads could
result in serious injury or death.
E-6 FUSE REPLACEMENT
Power supply board (4, Figure E-6) contains
four identical 5 amp fuses.
Perform the following procedure to check or re-
place a fuse. In addition, 2 additional 5 amp
fuses (F1 and F2) are included if the IFT unit
has an internal heater installed.
Disconnect and lock out power before
working on any electrical components.
There is voltage up to 240 Vac, and
could cause personal injury.
a. Turn off power to the system.
b. Open cover door (16) of the IFT by remov-
ing screws (17).
c. Remove protective cover (13) by removing
screws (14) and washers (15).
d. Unscrew fuseholder top and remove the
fuse (5). After checking or replacing a fuse,
reinstall the fuseholder top.
e. Replace protective cover (13) and secure
with washers (15) and screws (14).
f. Close cover door (16) and secure with
screws (17).
E-7 TRANSFORMER REPLACEMENT
Disconnect and lock out power before
working on any electrical components.
There is voltage up to 240 Vac, and
could cause personal injury.
a. Turn off power to the system.
b. Open cover door (16) of the IFT by remov-
ing screws (17).
c. Remove protective cover (13) by removing
screws (14) and washers (15).
d. Disconnect cable (1) from the receptacle on
microprocessor board (11). Disconnect GUI
assembly cable from receptacles on micro-
processor board if IFT is equipped with GUI.
e. Carefully tagging wires, remove the wires
from terminal strip on interconnect board
(12).
f. If unit is equipped with heater option, re-
move thermoswitch assembly (18, 19,
Figure E-8) by removing screws (13) and
washers (14).
g. Remove mounting plate (10) by removing
the necessary screws.
h. Disconnect transformer cable plugs from the
receptacles on power supply board (4).
i. Remove transformer (9) from enclosure (6)
by removing four screws (8).
j. Attach new transformer to enclosure (6) with
four screws (8).
k. Connect the transformer cable plugs from
transformer (9) to the receptacles on power
supply board (4).